Fork of Lua 5.1 to encourage end-user programming
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# .tlv file generated by https://github.com/akkartik/teliva
# You may edit it if you are careful; however, you may see cryptic errors if you
# violate Teliva's assumptions.
#
# .tlv files are representations of Teliva programs. Teliva programs consist of
# sequences of definitions. Each definition is a table of key/value pairs. Keys
# and values are both strings.
#
# Lines in .tlv files always follow exactly one of the following forms:
# - comment lines at the top of the file starting with '#' at column 0
# - beginnings of definitions starting with '- ' at column 0, followed by a
# key/value pair
# - key/value pairs consisting of ' ' at column 0, containing either a
# spaceless value on the same line, or a multi-line value
# - multiline values indented by more than 2 spaces, starting with a '>'
#
# If these constraints are violated, Teliva may unceremoniously crash. Please
# report bugs at http://akkartik.name/contact
- __teliva_timestamp: original
str_helpers:
>-- some string helpers from http://lua-users.org/wiki/StringIndexing
>
>-- index characters using []
>getmetatable('').__index = function(str,i)
> if type(i) == 'number' then
> return str:sub(i,i)
> else
> return string[i]
> end
>end
>
>-- ranges using (), selected bytes using {}
>getmetatable('').__call = function(str,i,j)
> if type(i)~='table' then
> return str:sub(i,j)
> else
> local t={}
> for k,v in ipairs(i) do
> t[k]=str:sub(v,v)
> end
> return table.concat(t)
> end
>end
>
>-- iterate over an ordered sequence
>function q(x)
> if type(x) == 'string' then
> return x:gmatch('.')
> else
> return ipairs(x)
> end
>end
>
>-- insert within string
>function string.insert(str1, str2, pos)
> return str1:sub(1,pos)..str2..str1:sub(pos+1)
>end
>
>function string.remove(s, pos)
> return s:sub(1,pos-1)..s:sub(pos+1)
>end
>
>function string.pos(s, sub)
> return string.find(s, sub, 1, true) -- plain=true to disable regular expressions
>end
>
>-- TODO: backport utf-8 support from Lua 5.3
- __teliva_timestamp: original
debugy:
>debugy = 5
- __teliva_timestamp: original
dbg:
>-- helper for debug by print; overlay debug information towards the right
>-- reset debugy every time you refresh screen
>function dbg(window, s)
> local oldy = 0
> local oldx = 0
> oldy, oldx = window:getyx()
> window:mvaddstr(debugy, 60, s)
> debugy = debugy+1
> window:mvaddstr(oldy, oldx, '')
>end
- __teliva_timestamp: original
check:
>function check(x, msg)
> if x then
> Window:addch('.')
> else
> print('F - '..msg)
> print(' '..str(x)..' is false/nil')
> teliva_num_test_failures = teliva_num_test_failures + 1
> -- overlay first test failure on editors
> if teliva_first_failure == nil then
> teliva_first_failure = msg
> end
> end
>end
- __teliva_timestamp: original
check_eq:
>function check_eq(x, expected, msg)
> if eq(x, expected) then
> Window:addch('.')
> else
> print('F - '..msg)
> print(' expected '..str(expected)..' but got '..str(x))
> teliva_num_test_failures = teliva_num_test_failures + 1
> -- overlay first test failure on editors
> if teliva_first_failure == nil then
> teliva_first_failure = msg
> end
> end
>end
- __teliva_timestamp: original
eq:
>function eq(a, b)
> if type(a) ~= type(b) then return false end
> if type(a) == 'table' then
> if #a ~= #b then return false end
> for k, v in pairs(a) do
> if b[k] ~= v then
> return false
> end
> end
> for k, v in pairs(b) do
> if a[k] ~= v then
> return false
> end
> end
> return true
> end
> return a == b
>end
- __teliva_timestamp: original
str:
>-- smarter tostring
>-- slow; used only for debugging
>function str(x)
> if type(x) == 'table' then
> local result = ''
> result = result..#x..'{'
> for k, v in pairs(x) do
> result = result..str(k)..'='..str(v)..', '
> end
> result = result..'}'
> return result
> elseif type(x) == 'string' then
> return '"'..x..'"'
> end
> return tostring(x)
>end
- __teliva_timestamp: original
find_index:
>function find_index(arr, x)
> for n, y in ipairs(arr) do
> if x == y then
> return n
> end
> end
>end
- __teliva_timestamp: original
trim:
>function trim(s)
> return s:gsub('^%s*', ''):gsub('%s*$', '')
>end
- __teliva_timestamp: original
split:
>function split(s, d)
> result = {}
> for match in (s..d):gmatch("(.-)"..d) do
> table.insert(result, match);
> end
> return result
>end
- __teliva_timestamp: original
map:
>-- only for arrays
>function map(l, f)
> result = {}
> for _, x in ipairs(l) do
> table.insert(result, f(x))
> end
> return result
>end
- __teliva_timestamp: original
reduce:
>-- only for arrays
>function reduce(l, f, init)
> result = init
> for _, x in ipairs(l) do
> result = f(result, x)
> end
> return result
>end
- __teliva_timestamp: original
filter:
>function filter(h, f)
> result = {}
> for k, v in pairs(h) do
> if f(k, v) then
> result[k] = v
> end
> end
> return result
>end
- __teliva_timestamp: original
ifilter:
>-- only for arrays
>function ifilter(l, f)
> result = {}
> for _, x in ipairs(l) do
> if f(x) then
> table.insert(result, x)
> end
> end
> return result
>end
- __teliva_timestamp: original
sort_letters:
>function sort_letters(s)
> tmp = {}
> for i=1,#s do
> table.insert(tmp, s[i])
> end
> table.sort(tmp)
> local result = ''
> for _, c in pairs(tmp) do
> result = result..c
> end
> return result
>end
>
>function test_sort_letters(s)
> check_eq(sort_letters(''), '', 'test_sort_letters: empty')
> check_eq(sort_letters('ba'), 'ab', 'test_sort_letters: non-empty')
> check_eq(sort_letters('abba'), 'aabb', 'test_sort_letters: duplicates')
>end
- __teliva_timestamp: original
count_letters:
>-- TODO: handle unicode
>function count_letters(s)
> local result = {}
> for i=1,s:len() do
> local c = s[i]
> if result[c] == nil then
> result[c] = 1
> else
> result[c] = result[c] + 1
> end
> end
> return result
>end
- __teliva_timestamp: original
count:
>-- turn an array of elements into a map from elements to their frequency
>-- analogous to count_letters for non-strings
>function count(a)
> local result = {}
> for i, v in ipairs(a) do
> if result[v] == nil then
> result[v] = 1
> else
> result[v] = result[v] + 1
> end
> end
> return result
>end
- __teliva_timestamp: original
union:
>function union(a, b)
> for k, v in pairs(b) do
> a[k] = v
> end
> return a
>end
- __teliva_timestamp: original
subtract:
>-- set subtraction
>function subtract(a, b)
> for k, v in pairs(b) do
> a[k] = nil
> end
> return a
>end
- __teliva_timestamp: original
all:
>-- universal quantifier on sets
>function all(s, f)
> for k, v in pairs(s) do
> if not f(k, v) then
> return false
> end
> end
> return true
>end
- __teliva_timestamp: original
to_array:
>-- turn a set into an array
>-- drops values
>function to_array(h)
> local result = {}
> for k, _ in pairs(h) do
> table.insert(result, k)
> end
> return result
>end
- __teliva_timestamp: original
append:
>-- concatenate list 'elems' into 'l', modifying 'l' in the process
>function append(l, elems)
> for i=1,#elems do
> table.insert(l, elems[i])
> end
>end
- __teliva_timestamp: original
prepend:
>-- concatenate list 'elems' into the start of 'l', modifying 'l' in the process
>function prepend(l, elems)
> for i=1,#elems do
> table.insert(l, i, elems[i])
> end
>end
- __teliva_timestamp: original
all_but:
>function all_but(x, idx)
> if type(x) == 'table' then
> local result = {}
> for i, elem in ipairs(x) do
> if i ~= idx then
> table.insert(result,elem)
> end
> end
> return result
> elseif type(x) == 'string' then
> if idx < 1 then return x:sub(1) end
> return x:sub(1, idx-1) .. x:sub(idx+1)
> else
> error('all_but: unsupported type '..type(x))
> end
>end
>
>function test_all_but()
> check_eq(all_but('', 0), '', 'all_but: empty')
> check_eq(all_but('abc', 0), 'abc', 'all_but: invalid low index')
> check_eq(all_but('abc', 4), 'abc', 'all_but: invalid high index')
> check_eq(all_but('abc', 1), 'bc', 'all_but: first index')
> check_eq(all_but('abc', 3), 'ab', 'all_but: final index')
> check_eq(all_but('abc', 2), 'ac', 'all_but: middle index')
>end
- __teliva_timestamp: original
set:
>function set(l)
> local result = {}
> for i, elem in ipairs(l) do
> result[elem] = true
> end
> return result
>end
- __teliva_timestamp: original
set_eq:
>function set_eq(l1, l2)
> return eq(set(l1), set(l2))
>end
>
>function test_set_eq()
> check(set_eq({1}, {1}), 'set_eq: identical')
> check(not set_eq({1, 2}, {1, 3}), 'set_eq: different')
> check(set_eq({1, 2}, {2, 1}), 'set_eq: order')
> check(set_eq({1, 2, 2}, {2, 1}), 'set_eq: duplicates')
>end
- __teliva_timestamp: original
clear:
>function clear(lines)
> while #lines > 0 do
> table.remove(lines)
> end
>end
- __teliva_timestamp: original
zap:
>function zap(target, src)
> clear(target)
> append(target, src)
>end
- __teliva_timestamp: original
mfactorial:
>-- memoized version of factorial
>-- doesn't memoize recursive calls, but may be good enough
>mfactorial = memo1(factorial)
- __teliva_timestamp: original
factorial:
>function factorial(n)
> local result = 1
> for i=1,n do
> result = result*i
> end
> return result
>end
- __teliva_timestamp: original
memo1:
>-- a higher-order function that takes a function of a single arg
>-- (that never returns nil)
>-- and returns a memoized version of it
>function memo1(f)
> local memo = {}
> return function(x)
> if memo[x] == nil then
> memo[x] = f(x)
> end
> return memo[x]
> end
>end
>
>-- mfactorial doesn't seem noticeably faster
>function test_memo1()
> for i=0,30 do
> check_eq(mfactorial(i), factorial(i), 'memo1 over factorial: '..str(i))
> end
>end
- __teliva_timestamp: original
num_permutations:
>-- number of permutations of n distinct objects, taken r at a time
>function num_permutations(n, r)
> return factorial(n)/factorial(n-r)
>end
>
>-- mfactorial doesn't seem noticeably faster
>function test_memo1()
> for i=0,30 do
> for j=0,i do
> check_eq(num_permutations(i, j), mfactorial(i)/mfactorial(i-j), 'num_permutations memoizes: '..str(i)..'P'..str(j))
> end
> end
>end
- __teliva_timestamp: original
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'^e', 'edit'},
>}
- __teliva_timestamp: original
Window:
>Window = curses.stdscr()
- __teliva_timestamp: original
window:
>-- constructor for fake screen and window
>-- call it like this:
>-- local w = window{
>-- kbd=kbd('abc'),
>-- scr=scr{h=5, w=4},
>-- }
>-- eventually it'll do everything a real ncurses window can
>function window(h)
> h.__index = h
> setmetatable(h, h)
> h.__index = function(table, key)
> return rawget(h, key)
> end
> h.attrset = function(self, x)
> self.scr.attrs = x
> end
> h.attron = function(self, x)
> -- currently same as attrset since Lua 5.1 doesn't have bitwise operators
> -- doesn't support multiple attrs at once
>-- local old = self.scr.attrs
>-- self.scr.attrs = old|x
> self.scr.attrs = x
> end
> h.attroff = function(self, x)
> -- currently borked since Lua 5.1 doesn't have bitwise operators
> -- doesn't support multiple attrs at once
>-- local old = self.scr.attrs
>-- self.scr.attrs = old & (~x)
> self.scr.attrs = curses.A_NORMAL
> end
> h.getch = function(self)
> local c = table.remove(h.kbd, 1)
> if c == nil then return c end
> return string.byte(c) -- for verisimilitude with ncurses
> end
> h.addch = function(self, c)
> local scr = self.scr
> if c == '\n' then
> scr.cursy = scr.cursy+1
> scr.cursx = 0
> return
> end
> if scr.cursy <= scr.h then
> scr[scr.cursy][scr.cursx] = {data=c, attrs=scr.attrs}
> scr.cursx = scr.cursx+1
> if scr.cursx > scr.w then
> scr.cursy = scr.cursy+1
> scr.cursx = 1
> end
> end
> end
> h.addstr = function(self, s)
> for i=1,s:len() do
> self:addch(s[i])
> end
> end
> h.mvaddch = function(self, y, x, c)
> self.scr.cursy = y
> self.scr.cursx = x
> self:addch(c)
> end
> h.mvaddstr = function(self, y, x, s)
> self.scr.cursy = y
> self.scr.cursx = x
> self:addstr(s)
> end
> h.clear = function(self)
> clear_scr(self.scr)
> end
> h.refresh = function(self)
> -- nothing
> end
> return h
>end
- __teliva_timestamp: original
kbd:
>function kbd(keys)
> local result = {}
> for i=1,keys:len() do
> table.insert(result, keys[i])
> end
> return result
>end
- __teliva_timestamp: original
scr:
>function scr(props)
> props.cursx = 1
> props.cursy = 1
> clear_scr(props)
> return props
>end
- __teliva_timestamp: original
clear_scr:
>function clear_scr(props)
> props.cursy = 1
> props.cursx = 1
> for y=1,props.h do
> props[y] = {}
> for x=1,props.w do
> props[y][x] = {data=' ', attrs=curses.A_NORMAL}
> end
> end
> return props
>end
- __teliva_timestamp: original
check_screen:
>function check_screen(window, contents, message)
> local x, y = 1, 1
> for i=1,contents:len() do
> check_eq(window.scr[y][x].data, contents[i], message..'/'..y..','..x)
> x = x+1
> if x > window.scr.w then
> y = y+1
> x = 1
> end
> end
>end
>
>-- putting it all together, an example test of both keyboard and screen
>function test_check_screen()
> local lines = {
> c='123',
> d='234',
> a='345',
> b='456',
> }
> local w = window{
> kbd=kbd('abc'),
> scr=scr{h=3, w=5},
> }
> local y = 1
> while true do
> local b = w:getch()
> if b == nil then break end
> w:mvaddstr(y, 1, lines[string.char(b)])
> y = y+1
> end
> check_screen(w, '345 '..
> '456 '..
> '123 ',
> 'test_check_screen')
>end
- __teliva_timestamp: original
check_reverse:
>function check_reverse(window, contents, message)
> local x, y = 1, 1
> for i=1,contents:len() do
> if contents[i] ~= ' ' then
> -- hacky version while we're without bitwise operators on Lua 5.1
>-- check(window.scr[y][x].attrs & curses.A_REVERSE, message..'/'..y..','..x)
> check_eq(window.scr[y][x].attrs, curses.A_REVERSE, message..'/'..y..','..x)
> else
> -- hacky version while we're without bitwise operators on Lua 5.1
>-- check(window.scr[y][x].attrs & (~curses.A_REVERSE), message..'/'..y..','..x)
> check(window.scr[y][x].attrs ~= curses.A_REVERSE, message..'/'..y..','..x)
> end
> x = x+1
> if x > window.scr.w then
> y = y+1
> x = 1
> end
> end
>end
- __teliva_timestamp: original
check_bold:
>function check_bold(window, contents, message)
> local x, y = 1, 1
> for i=1,contents:len() do
> if contents[i] ~= ' ' then
> -- hacky version while we're without bitwise operators on Lua 5.1
>-- check(window.scr[y][x].attrs & curses.A_BOLD, message..'/'..y..','..x)
> check_eq(window.scr[y][x].attrs, curses.A_BOLD, message..'/'..y..','..x)
> else
> -- hacky version while we're without bitwise operators on Lua 5.1
>-- check(window.scr[y][x].attrs & (~curses.A_BOLD), message..'/'..y..','..x)
> check(window.scr[y][x].attrs ~= curses.A_BOLD, message..'/'..y..','..x)
> end
> x = x+1
> if x > window.scr.w then
> y = y+1
> x = 1
> end
> end
>end
- __teliva_timestamp: original
check_color:
>-- check which parts of a screen have the given color_pair
>function check_color(window, cp, contents, message)
> local x, y = 1, 1
> for i=1,contents:len() do
> if contents[i] ~= ' ' then
> -- hacky version while we're without bitwise operators on Lua 5.1
>-- check(window.scr[y][x].attrs & curses.color_pair(cp), message..'/'..y..','..x)
> check_eq(window.scr[y][x].attrs, curses.color_pair(cp), message..'/'..y..','..x)
> else
> -- hacky version while we're without bitwise operators on Lua 5.1
>-- check(window.scr[y][x].attrs & (~curses.A_BOLD), message..'/'..y..','..x)
> check(window.scr[y][x].attrs ~= curses.color_pair(cp), message..'/'..y..','..x)
> end
> x = x+1
> if x > window.scr.w then
> y = y+1
> x = 1
> end
> end
>end
- __teliva_timestamp: original
spaces:
>function spaces(n)
> for i=1,n do
> Window:addch(' ')
> end
>end
- __teliva_timestamp: original
init_colors:
>function init_colors()
> -- light background
> curses.init_pair(view_settings.current_zettel_bg, 236, 230)
> curses.init_pair(1, 236, 250)
> curses.init_pair(2, 236, 252)
> -- dark background
>--? curses.init_pair(view_settings.current_zettel_bg, 252, 130)
>--? curses.init_pair(1, 252, 240)
>--? curses.init_pair(2, 252, 242)
>end
- __teliva_timestamp: original
main:
>function main()
> init_colors()
> current_zettel_id = zettels.root
>
> while true do
> render(Window)
> update(Window)
> end
>end
- __teliva_timestamp: original
depth:
>function depth(zettel)
> local result = 0
> while zettel.parent do
> result = result+1
> zettel = zettel.parent
> end
> return result
>end
- __teliva_timestamp: original
render_zettel:
>function render_zettel(window, bg, indent, starty, startx, zettel)
> window:attrset(curses.color_pair(bg))
> for y=0,view_settings.height-1 do
> for x=0,view_settings.width-1 do
> window:mvaddch(y+starty, x+startx, ' ')
> end
> end
> local y, x = 0, indent+1
> for i=1,#zettel.data do
> local c = zettel.data[i]
> if c == '\n' then
> y = y+1
> x = indent+1
> else
> window:mvaddstr(y+starty, x+startx, c)
> x = x+1
> if x >= startx + view_settings.width then
> y = y+1
> x = indent+1
> end
> end
> if y >= view_settings.height then
> break
> end
> end
>end
- __teliva_timestamp: original
current_zettel_id:
>current_zettel_id = ''
- __teliva_timestamp: original
view_settings:
>view_settings = {
> -- dimensions for rendering a single zettel; extra text gets truncated
> width=50,
> height=3,
> -- spacing between zettels
> hmargin=1,
> vmargin=1,
> --
> indent=2, -- how children of a zettel are indicated
> current_zettel_bg=3, -- color pair index initialized in init_colors
>}
- __teliva_timestamp: original
zettels:
>zettels = {
> root="a",
> a={
> data="abc\ndef",
> child="c",
> next="b",
> },
> b={
> data="ghi\njklm",
> prev="a",
> },
> c={
> data="c",
> parent="a",
> next="d",
> },
> d={
> data="d",
> parent="a",
> prev="c",
> }
>}
- __teliva_timestamp: original
render_state:
>-- some information about what's been drawn on screen
>render_state = {
> -- where the current zettel is, in units of zettels
> curr_h = 1,
> curr_w = 1,
> -- what zettel is at each position on screen, in units of zettels
> hw2id = {},
>}
- __teliva_timestamp: original
update:
>function update(window)
> local key = window:getch()
> local curr = zettels[current_zettel_id]
> -- graph-based navigation
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- screen-based navigation
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> --
> elseif key == 5 then -- ctrl-e
> editz(window)
> end
>end
- __teliva_timestamp: original
render:
>function render(window)
> window:clear()
> local lines, cols = window:getmaxyx()
> local bg=1
> local y, x = 0, 0 -- units of characters (0-based)
> local w, h = 1, 1 -- units of zettels (1-based)
> -- render zettels depth-first, while tracking relative positions
> local done = {}
> local inprogress = {zettels.root}
> render_state.wh2id = {{}}
> while #inprogress > 0 do
> local currid = table.remove(inprogress)
> if not done[currid] then
> done[currid] = true
> table.insert(render_state.wh2id[w], currid)
> local zettel = zettels[currid]
> if currid == current_zettel_id then
> render_state.curr_w = w
> render_state.curr_h = h
> end
> local currbg = (currid == current_zettel_id) and view_settings.current_zettel_bg or bg
> render_zettel(window, currbg, depth(zettel) * view_settings.indent, y, x, zettel)
> if zettel.next then table.insert(inprogress, zettel.next) end
> if zettel.child then table.insert(inprogress, zettel.child) end
> bg = 3 - bg -- toggle between color pairs 1 and 2
> y = y + view_settings.height + view_settings.vmargin
> h = h + 1
> if y + view_settings.height > lines then
> y = 0
> h = 1
> x = x + view_settings.width + view_settings.hmargin
> w = w + 1
> if x + view_settings.width > cols then break end
> table.insert(render_state.wh2id, {})
> end
> end
> end
> window:mvaddstr(lines-2, 0, '')
> for i=1,3 do
> window:attrset(curses.color_pair(i%2+1))
> window:addstr('')
> spaces(view_settings.width-string.len(''))
> window:attrset(curses.color_pair(0))
> window:addstr(' ') -- margin
> end
> window:mvaddstr(lines-1, 0, '? ')
> window:refresh()
>end
- __teliva_timestamp: original
view_settings:
>view_settings = {
> -- dimensions for rendering a single zettel; extra text gets truncated
> width=50,
> height=3,
> -- spacing between zettels
> hmargin=1,
> vmargin=1,
> --
> indent=2, -- how children of a zettel are indicated
> current_zettel_bg=3, -- color pair index initialized in init_colors
>}
- __teliva_timestamp: original
editz:
>function editz(window)
> menu = { {'^e', 'back to browsing'},}
> local top = (render_state.curr_h - 1) * (view_settings.height + view_settings.vmargin)
> local bottom = top + view_settings.height
> local left = (render_state.curr_w - 1) * (view_settings.width + view_settings.hmargin)
> local right = left + view_settings.width
> local cursor = 1
> curses.curs_set(0)
> local quit = false
> while not quit do
> editz_render(window, zettels[current_zettel_id].data, cursor, top, bottom, left, right)
> quit, zettels[current_zettel_id].data, cursor = editz_update(window, zettels[current_zettel_id].data, cursor)
> end
> curses.curs_set(1)
>end
- __teliva_timestamp: original
editz_render:
>function editz_render(window, s, cursor, top, minbottom, left, right)
> local h, w = window:getmaxyx()
> window:attrset(curses.color_pair(view_settings.current_zettel_bg))
> for y=top,minbottom-1 do
> for x=left,right-1 do
> window:mvaddch(y, x, ' ')
> end
> end
> local y, x = top, left + 1 -- left padding; TODO: indent
> window:mvaddstr(y, x, '')
> for i=1,s:len() do
> -- render character
> if i == cursor then
> if s[i] == '\n' then
> -- newline at cursor = render extra space in reverse video before jumping to new line
> window:attron(curses.A_REVERSE)
> window:addch(' ')
> window:attroff(curses.A_REVERSE)
> else
> -- most characters at cursor = render in reverse video
> window:attron(curses.A_REVERSE)
> window:addstr(s[i])
> window:attroff(curses.A_REVERSE)
> end
> else
> if s[i] ~= '\n' then
> window:addstr(s[i])
> end
> end
> -- update cursor position
> if s[i] == '\n' then
> if i == cursor then x = x + 1; end
> for col=x,right-1 do window:addch(' '); end
> x = left
> y = y + 1
> if y >= h-2 then return end
> window:mvaddstr(y, x, '')
> for col=x,right-1 do window:addch(' '); end
> x = left + 1 -- left padding; TODO: indent
> window:mvaddstr(y, x, '')
> else
> x = x + 1
> if x >= right then
> y = y + 1
> if y >= h-2 then return end
> x = left + 1 -- left padding; TODO: indent
> window:mvaddstr(y, x, '')
> end
> end
> end
> if cursor > s:len() then
> window:attron(curses.A_REVERSE)
> window:addch(' ')
> window:attroff(curses.A_REVERSE)
> else
> window:addch(' ')
> end
>end
- __teliva_timestamp: original
editz_update:
>function editz_update(window, prose, cursor)
> local key = window:getch()
> local h, w = window:getmaxyx()
> if key == curses.KEY_LEFT then
> if cursor > 1 then
> cursor = cursor-1
> end
> elseif key == curses.KEY_RIGHT then
> if cursor <= #prose then
> cursor = cursor+1
> end
> elseif key == curses.KEY_DOWN then
> cursor = cursor_down(prose, cursor, w)
> elseif key == curses.KEY_UP then
> cursor = cursor_up(prose, cursor, w)
> elseif key == curses.KEY_BACKSPACE or key == 8 or key == 127 then -- ctrl-h, ctrl-?, delete
> if cursor > 1 then
> cursor = cursor-1
> prose = prose:remove(cursor)
> end
> elseif key == 5 then -- ctrl-e
> return true, prose, cursor
> elseif key == 10 or (key >= 32 and key < 127) then
> prose = prose:insert(string.char(key), cursor-1)
> cursor = cursor+1
> end
> return false, prose, cursor
>end
- __teliva_timestamp: original
cursor_down:
>function cursor_down(s, old_idx, width)
> local max = s:len()
> local i = 1
> -- compute oldcol, the screen column of old_idx
> local oldcol = 0
> local col = 0
> while true do
> if i > max then
> -- abnormal old_idx
> return old_idx
> end
> if i == old_idx then
> oldcol = col
> break
> end
> if s[i] == '\n' then
> col = 0
> else
> col = col+1
> end
> i = i+1
> end
> -- skip rest of line
> while true do
> if i > max then
> -- current line is at bottom
> if col >= width then
> return i
> end
> return old_idx
> end
> if s[i] == '\n' then
> break
> end
> if i - old_idx >= width then
> return i
> end
> col = col+1
> i = i+1
> end
> -- compute index at same column on next line
> -- i is at a newline
> i = i+1
> col = 0
> while true do
> if i > max then
> -- next line is at bottom and is too short; position at end of it
> return i
> end
> if s[i] == '\n' then
> -- next line is too short; position at end of it
> return i
> end
> if col == oldcol then
> return i
> end
> col = col+1
> i = i+1
> end
>end
>
>function test_cursor_down()
> -- lines that don't wrap
> check_eq(cursor_down('abc\ndef', 1, 5), 5, 'cursor_down: non-bottom line first char')
> check_eq(cursor_down('abc\ndef', 2, 5), 6, 'cursor_down: non-bottom line mid char')
> check_eq(cursor_down('abc\ndef', 3, 5), 7, 'cursor_down: non-bottom line final char')
> check_eq(cursor_down('abc\ndef', 4, 5), 8, 'cursor_down: non-bottom line end')
> check_eq(cursor_down('abc\ndef', 5, 5), 5, 'cursor_down: bottom line first char')
> check_eq(cursor_down('abc\ndef', 6, 5), 6, 'cursor_down: bottom line mid char')
> check_eq(cursor_down('abc\ndef', 7, 5), 7, 'cursor_down: bottom line final char')
> check_eq(cursor_down('abc\n\ndef', 2, 5), 5, 'cursor_down: to shorter line')
>
> -- within a single wrapping line
> -- |abcde| <-- wrap, no newline
> -- |fgh |
> check_eq(cursor_down('abcdefgh', 1, 5), 6, 'cursor_down from wrapping line: first char')
> check_eq(cursor_down('abcdefgh', 2, 5), 7, 'cursor_down from wrapping line: mid char')
> check_eq(cursor_down('abcdefgh', 5, 5), 9, 'cursor_down from wrapping line: to shorter line')
>
> -- within a single very long wrapping line
> -- |abcde| <-- wrap, no newline
> -- |fghij| <-- wrap, no newline
> -- |klm |
> check_eq(cursor_down('abcdefghijklm', 1, 5), 6, 'cursor_down within wrapping line: first char')
> check_eq(cursor_down('abcdefghijklm', 2, 5), 7, 'cursor_down within wrapping line: mid char')
> check_eq(cursor_down('abcdefghijklm', 5, 5), 10, 'cursor_down within wrapping line: final char')
>end
- __teliva_timestamp: original
__teliva_note:
>initial commit: show/edit zettels
cursor_up:
>function cursor_up(s, old_idx, width)
> local max = s:len()
> local i = 1
> -- compute oldcol, the screen column of old_idx
> local oldcol = 0
> local col = 0
> local newline_before_current_line = 0
> while true do
> if i > max or i == old_idx then
> oldcol = col
> break
> end
> if s[i] == '\n' then
> col = 0
> newline_before_current_line = i
> else
> col = col+1
> if col == width then
> col = 0
> end
> end
> i = i+1
> end
> -- find previous newline
> i = i-col-1
> if old_idx - newline_before_current_line > width then
> -- we're in a wrapped line
> return old_idx - width
> end
> -- scan back to start of previous line
> if s[i] == '\n' then
> i = i-1
> end
> while true do
> if i < 1 then
> -- current line is at top
> break
> end
> if s[i] == '\n' then
> break
> end
> i = i-1
> end
> -- i is at a newline
> i = i+1
> -- skip whole screen lines within previous line
> while newline_before_current_line - i > width do
> i = i + width
> end
> -- compute index at same column on previous screen line
> col = 0
> while true do
> if i > max then
> -- next line is at bottom and is too short; position at end of it
> return i
> end
> if s[i] == '\n' then
> -- next line is too short; position at end of it
> return i
> end
> if col == oldcol then
> return i
> end
> col = col+1
> i = i+1
> end
>end
>
>function test_cursor_up()
> -- lines that don't wrap
> check_eq(cursor_up('abc\ndef', 1, 5), 1, 'cursor_up: top line first char')
> check_eq(cursor_up('abc\ndef', 2, 5), 2, 'cursor_up: top line mid char')
> check_eq(cursor_up('abc\ndef', 3, 5), 3, 'cursor_up: top line final char')
> check_eq(cursor_up('abc\ndef', 4, 5), 4, 'cursor_up: top line end')
> check_eq(cursor_up('abc\ndef', 5, 5), 1, 'cursor_up: non-top line first char')
> check_eq(cursor_up('abc\ndef', 6, 5), 2, 'cursor_up: non-top line mid char')
> check_eq(cursor_up('abc\ndef', 7, 5), 3, 'cursor_up: non-top line final char')
> check_eq(cursor_up('abc\ndef\n', 8, 5), 4, 'cursor_up: non-top line end')
> check_eq(cursor_up('ab\ndef\n', 7, 5), 3, 'cursor_up: to shorter line')
>
> -- within a single wrapping line
> -- |abcde| <-- wrap, no newline
> -- |fgh |
> check_eq(cursor_up('abcdefgh', 6, 5), 1, 'cursor_up from wrapping line: first char')
> check_eq(cursor_up('abcdefgh', 7, 5), 2, 'cursor_up from wrapping line: mid char')
> check_eq(cursor_up('abcdefgh', 8, 5), 3, 'cursor_up from wrapping line: final char')
> check_eq(cursor_up('abcdefgh', 9, 5), 4, 'cursor_up from wrapping line: wrapped line end')
>
> -- within a single very long wrapping line
> -- |abcde| <-- wrap, no newline
> -- |fghij| <-- wrap, no newline
> -- |klm |
> check_eq(cursor_up('abcdefghijklm', 11, 5), 6, 'cursor_up within wrapping line: first char')
> check_eq(cursor_up('abcdefghijklm', 12, 5), 7, 'cursor_up within wrapping line: mid char')
> check_eq(cursor_up('abcdefghijklm', 13, 5), 8, 'cursor_up within wrapping line: final char')
> check_eq(cursor_up('abcdefghijklm', 14, 5), 9, 'cursor_up within wrapping line: wrapped line end')
>
> -- from below to (the bottom of) a wrapping line
> -- |abcde| <-- wrap, no newline
> -- |fg |
> -- |hij |
> check_eq(cursor_up('abcdefg\nhij', 9, 5), 6, 'cursor_up to wrapping line: first char')
> check_eq(cursor_up('abcdefg\nhij', 10, 5), 7, 'cursor_up to wrapping line: mid char')
> check_eq(cursor_up('abcdefg\nhij', 11, 5), 8, 'cursor_up to wrapping line: final char')
> check_eq(cursor_up('abcdefg\nhij', 12, 5), 8, 'cursor_up to wrapping line: to shorter line')
>end
- __teliva_timestamp:
>Wed Feb 9 08:15:25 2022
render:
>function render(window)
> window:clear()
> local lines, cols = window:getmaxyx()
> local bg=1
> local y, x = 0, 0 -- units of characters (0-based)
> local w, h = 1, 1 -- units of zettels (1-based)
> -- render zettels depth-first, while tracking relative positions
> local done = {}
> local inprogress = {zettels.root}
> render_state.wh2id = {{}}
> while #inprogress > 0 do
> local currid = table.remove(inprogress)
> if not done[currid] then
> done[currid] = true
> table.insert(render_state.wh2id[w], currid)
> local zettel = zettels[currid]
> if currid == current_zettel_id then
> render_state.curr_w = w
> render_state.curr_h = h
> end
> local currbg = (currid == current_zettel_id) and view_settings.current_zettel_bg or bg
> render_zettel(window, currbg, depth(zettel) * view_settings.indent, y, x, zettel)
> if zettel.next then table.insert(inprogress, zettel.next) end
> if zettel.child then table.insert(inprogress, zettel.child) end
> bg = 3 - bg -- toggle between color pairs 1 and 2
> y = y + view_settings.height + view_settings.vmargin
> h = h + 1
> if y + view_settings.height > lines then
> y = 0
> h = 1
> x = x + view_settings.width + view_settings.hmargin
> w = w + 1
> if x + view_settings.width > cols then break end
> table.insert(render_state.wh2id, {})
> end
> end
> end
> window:mvaddstr(lines-1, 0, '')
> for i=1,3 do
> window:attrset(curses.color_pair(i%2+1))
> window:addstr('')
> spaces(view_settings.width-string.len(''))
> window:attrset(curses.color_pair(0))
> window:addstr(' ') -- margin
> end
> window:refresh()
>end
- __teliva_timestamp:
>Wed Feb 9 08:15:35 2022
main:
>function main()
> init_colors()
> current_zettel_id = zettels.root
>
> curses.curs_set(0)
> while true do
> render(Window)
> update(Window)
> end
>end
- __teliva_timestamp:
>Wed Feb 9 08:16:24 2022
__teliva_note:
>get rid of commandline
>
>There's a reason vim hides it. Confusing to have two cursors on screen.
editz:
>function editz(window)
> menu = { {'^e', 'back to browsing'},}
> local top = (render_state.curr_h - 1) * (view_settings.height + view_settings.vmargin)
> local bottom = top + view_settings.height
> local left = (render_state.curr_w - 1) * (view_settings.width + view_settings.hmargin)
> local right = left + view_settings.width
> local cursor = 1
> local quit = false
> while not quit do
> editz_render(window, zettels[current_zettel_id].data, cursor, top, bottom, left, right)
> quit, zettels[current_zettel_id].data, cursor = editz_update(window, zettels[current_zettel_id].data, cursor)
> end
>end
- __teliva_timestamp:
>Wed Feb 9 08:22:20 2022
editz_render:
>function editz_render(window, s, cursor, top, minbottom, left, right)
> local h, w = window:getmaxyx()
> local cursor_y, cursor_x = 0, 0
> window:attrset(curses.color_pair(view_settings.current_zettel_bg))
> for y=top,minbottom-1 do
> for x=left,right-1 do
> window:mvaddch(y, x, ' ')
> end
> end
> local y, x = top, left + 1 -- left padding; TODO: indent
> window:mvaddstr(y, x, '')
> for i=1,s:len() do
> if i == cursor then
> cursor_y = y
> cursor_x = x
> end
> if s[i] ~= '\n' then
> window:addstr(s[i])
> x = x + 1
> if x >= right then
> y = y + 1
> if y >= h-2 then return end
> x = left + 1 -- left padding; TODO: indent
> window:mvaddstr(y, x, '')
> end
> else
> for col=x+1,right-1 do window:addch(' '); end
> x = left
> y = y + 1
> if y >= h-2 then return end
> window:mvaddstr(y, x, '')
> for col=x,right-1 do window:addch(' '); end
> x = left + 1 -- left padding; TODO: indent
> window:mvaddstr(y, x, '')
> end
> end
> if cursor_y == 0 and cursor_x == 0 then
> cursor_y = y
> cursor_x = x
> end
> window:mvaddstr(cursor_y, cursor_x, '')
>end
- __teliva_timestamp:
>Wed Feb 9 08:25:05 2022
editz:
>function editz(window)
> local old_menu = menu
> menu = { {'^e', 'back to browsing'},}
> local top = (render_state.curr_h - 1) * (view_settings.height + view_settings.vmargin)
> local bottom = top + view_settings.height
> local left = (render_state.curr_w - 1) * (view_settings.width + view_settings.hmargin)
> local right = left + view_settings.width
> local cursor = zettels[current_zettel_id].data:len()+1
> local quit = false
> curses.curs_set(1)
> while not quit do
> editz_render(window, zettels[current_zettel_id].data, cursor, top, bottom, left, right)
> quit, zettels[current_zettel_id].data, cursor = editz_update(window, zettels[current_zettel_id].data, cursor)
> end
> curses.curs_set(0)
> menu = old_menu
>end
- __teliva_timestamp:
>Wed Feb 9 08:28:13 2022
__teliva_note:
>stop simulating the cursor
>
>editz_render is now much simpler
editz_update:
>function editz_update(window, prose, cursor)
> local key = window:getch()
> local h, w = window:getmaxyx()
> if key == curses.KEY_LEFT then
> if cursor > 1 then
> cursor = cursor-1
> end
> elseif key == curses.KEY_RIGHT then
> if cursor <= #prose then
> cursor = cursor+1
> end
> elseif key == curses.KEY_DOWN then
> cursor = cursor_down(prose, cursor, w)
> elseif key == curses.KEY_UP then
> cursor = cursor_up(prose, cursor, w)
> elseif key == curses.KEY_BACKSPACE or key == 8 or key == 127 then -- ctrl-h, ctrl-?, delete
> if cursor > 1 then
> cursor = cursor-1
> prose = prose:remove(cursor)
> end
> elseif key == 5 then -- ctrl-e
> return true, prose, cursor
> elseif key == 10 or (key >= 32 and key < 127) then
> prose = prose:insert(string.char(key), cursor-1)
> cursor = cursor+1
> end
> return false, prose, cursor
>end
- __teliva_timestamp:
>Wed Feb 9 17:55:52 2022
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'j', 'child'},
> {'k', 'parent'},
> {'l,h', 'next/prev sib'},
> {'e', 'edit'},
>}
- __teliva_timestamp:
>Wed Feb 9 17:56:18 2022
__teliva_note:
>no need for chords once we drop the commandline
update:
>function update(window)
> local key = window:getch()
> local curr = zettels[current_zettel_id]
> -- graph-based navigation
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- screen-based navigation
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> --
> elseif key == string.byte('e') then
> local old_menu = menu
> editz(window)
> menu = old_menu
> end
>end
- __teliva_timestamp:
>Wed Feb 9 18:00:42 2022
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'j', 'child'},
> {'k', 'parent'},
> {'l,h', 'next/prev sib'},
> {'e', 'edit'},
> {'a,b', 'insert sib'},
> {'c', 'insert child'},
>}
- __teliva_timestamp:
>Wed Feb 9 18:16:23 2022
zettels:
>zettels = {
> root="id1",
> final=4,
> id1={
> data="this is zettel A\n\nit has some text",
> child="id3",
> next="id2",
> },
> id2={
> data="this is a sibling of zettel A at the top level",
> prev="id1",
> },
> id3={
> data="this is zettel B, a child of A",
> parent="id1",
> next="id4",
> },
> id4={
> data="this is another child of zettel A, a sibling of B",
> parent="id1",
> prev="id3",
> }
>}
- __teliva_timestamp:
>Wed Feb 9 23:04:49 2022
new_id:
>function new_id()
> zettels.final = zettels.final+1
> local result = 'id'..tostring(zettels.final)
> zettels[result] = {}
> return result
>end
- __teliva_timestamp:
>Wed Feb 9 23:10:57 2022
__teliva_note:
>creating new zettels
>
>feels natural to immediately start editing them
update:
>function update(window)
> local key = window:getch()
> local curr = zettels[current_zettel_id]
> assert(curr, string.format('cursor fell off the edge of the world: %s', type(current_zettel_id)))
> -- graph-based navigation
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- screen-based navigation
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> --
> elseif key == string.byte('e') then
> editz(window)
> elseif key == string.byte('a') then
> -- insert sibling after
> local old = curr.next
> curr.next = new_id()
> local new = zettels[curr.next]
> new.data = ''
> new.next = old
> zettels[old].prev = curr.next
> new.prev = current_zettel_id
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> new.parent = curr.parent
> current_zettel_id = curr.next
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('b') then
> -- insert sibling before
> local old = curr.prev
> curr.prev = new_id()
> local new = zettels[curr.prev]
> new.data = ''
> new.prev = old
> zettels[old].next = curr.prev
> new.next = current_zettel_id
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> new.parent = curr.parent
> current_zettel_id = curr.prev
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('c') then
> -- insert child
> local old = curr.child
> curr.child = new_id()
> local new = zettels[curr.child]
> new.data = ''
> new.next = old
> assert(zettels[old].prev == nil, "first child shouldn't have a previous sibling")
> zettels[old].prev = curr.child
> new.parent = curr
> current_zettel_id = curr.child
> render(window) -- recompute render_state
> editz(window)
> end
>end
- __teliva_timestamp:
>Thu Feb 10 00:01:58 2022
update:
>function update(window)
> local key = window:getch()
> local h, w = window:getmaxyx()
> local curr = zettels[current_zettel_id]
> assert(curr, string.format('cursor fell off the edge of the world: %s', type(current_zettel_id)))
> -- graph-based navigation
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- screen-based navigation
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> --
> elseif key == string.byte('e') then
> editz(window)
> elseif key == string.byte('a') then
> -- insert sibling after
> local old = curr.next
> curr.next = new_id()
> local new = zettels[curr.next]
> new.data = ''
> new.next = old
> zettels[old].prev = curr.next
> new.prev = current_zettel_id
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> new.parent = curr.parent
> current_zettel_id = curr.next
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('b') then
> -- insert sibling before
> local old = curr.prev
> curr.prev = new_id()
> local new = zettels[curr.prev]
> new.data = ''
> new.prev = old
> zettels[old].next = curr.prev
> new.next = current_zettel_id
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> new.parent = curr.parent
> current_zettel_id = curr.prev
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('c') then
> -- insert child
> local old = curr.child
> curr.child = new_id()
> local new = zettels[curr.child]
> new.data = ''
> new.next = old
> assert(zettels[old].prev == nil, "first child shouldn't have a previous sibling")
> zettels[old].prev = curr.child
> new.parent = curr
> current_zettel_id = curr.child
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('x') then
> if view_settings.width > 5 then
> view_settings.width = view_settings.width - 5
> end
> elseif key == string.byte('X') then
> if view_settings.width < w-5 then
> view_settings.width = view_settings.width + 5
> end
> elseif key == string.byte('y') then
> if view_settings.height > 0 then
> view_settings.height = view_settings.height - 1
> end
> elseif key == string.byte('Y') then
> if view_settings.height < h-2 then
> view_settings.height = view_settings.height + 1
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 00:02:35 2022
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'j', 'child'},
> {'k', 'parent'},
> {'l,h', 'next/prev sib'},
> {'e', 'edit'},
> {'a,b', 'insert sib'},
> {'c', 'insert child'},
> {'x,X,y,Y', 'resize'},
>}
- __teliva_timestamp:
>Thu Feb 10 06:57:51 2022
__teliva_note:
>squeeze menu to make way for next feature
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'a,b,c', 'insert sib/child'},
> {'e', 'edit'},
> {'j,k,l,h', 'move to child/parent/sib'},
> {'x,X,y,Y', 'resize'},
>}
- __teliva_timestamp:
>Thu Feb 10 07:00:46 2022
__teliva_note:
>bugfix: handle missing parent/child/sib
update:
>function update(window)
> local key = window:getch()
> local h, w = window:getmaxyx()
> local curr = zettels[current_zettel_id]
> assert(curr, string.format('cursor fell off the edge of the world: %s', type(current_zettel_id)))
> -- graph-based navigation
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- screen-based navigation
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> --
> elseif key == string.byte('e') then
> editz(window)
> elseif key == string.byte('a') then
> -- insert sibling after
> local old = curr.next
> curr.next = new_id()
> local new = zettels[curr.next]
> new.data = ''
> new.next = old
> new.prev = current_zettel_id
> if old then
> zettels[old].prev = curr.next
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.next
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('b') then
> -- insert sibling before
> local old = curr.prev
> curr.prev = new_id()
> local new = zettels[curr.prev]
> new.data = ''
> new.prev = old
> new.next = current_zettel_id
> if old then
> zettels[old].next = curr.prev
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.prev
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('c') then
> -- insert child
> local old = curr.child
> curr.child = new_id()
> local new = zettels[curr.child]
> new.data = ''
> new.next = old
> if old then
> assert(zettels[old].prev == nil, "first child shouldn't have a previous sibling")
> zettels[old].prev = curr.child
> end
> new.parent = curr
> current_zettel_id = curr.child
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('x') then
> if view_settings.width > 5 then
> view_settings.width = view_settings.width - 5
> end
> elseif key == string.byte('X') then
> if view_settings.width < w-5 then
> view_settings.width = view_settings.width + 5
> end
> elseif key == string.byte('y') then
> if view_settings.height > 0 then
> view_settings.height = view_settings.height - 1
> end
> elseif key == string.byte('Y') then
> if view_settings.height < h-2 then
> view_settings.height = view_settings.height + 1
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 07:27:43 2022
write_zettels:
>function write_zettels(outfile)
> outfile:write(json.encode(zettels))
> outfile:close()
>end
- __teliva_timestamp:
>Thu Feb 10 07:28:30 2022
read_zettels:
>function read_zettels(infile)
> zettels = json.decode(infile:read('*a'))
> infile:close()
>end
- __teliva_timestamp:
>Thu Feb 10 07:30:25 2022
__teliva_note:
>saving/loading zettels to/from disk
main:
>function main()
> init_colors()
> curses.curs_set(0) -- hide cursor except when editing
>
> -- read zettels from disk if possible
> local infile = io.open('zet', 'r')
> if infile then
> read_zettels(infile)
> else
> local outfile = io.open('zet', 'w')
> if outfile then
> write_zettels(outfile)
> end
> end
> current_zettel_id = zettels.root
>
> while true do
> render(Window)
> update(Window)
>
> -- save zettels, but hold on to previous state on disk
> -- until last possible second
> local filename = os.tmpname()
> local outfile = io.open(filename, 'w')
> write_zettels(outfile)
> os.rename(filename, 'zet')
> end
>end
- __teliva_timestamp:
>Thu Feb 10 07:32:46 2022
__teliva_note:
>stop writing sample zettels to disk
>
>That was just for ease of testing write_zettels()
main:
>function main()
> init_colors()
> curses.curs_set(0) -- hide cursor except when editing
>
> local infile = io.open('zet', 'r')
> if infile then
> read_zettels(infile)
> end
> current_zettel_id = zettels.root
>
> while true do
> render(Window)
> update(Window)
>
> -- save zettels, but hold on to previous state on disk
> -- until last possible second
> local filename = os.tmpname()
> local outfile = io.open(filename, 'w')
> if outfile then
> write_zettels(outfile)
> os.rename(filename, 'zet')
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 07:43:39 2022
zettels:
>-- initial state of the zettels
>-- if you came here to clear the zettels,
>-- delete everything (ctrl-k and ctrl-u will delete a whole line at a time)
>-- until it looks like this:
>--
>-- zettels = {
>-- root='id1',
>-- final=1,
>-- id1={
>-- data='',
>-- },
>-- }
>--
>-- I don't yet trust any deletion feature I create to not mess up your data.
>-- Besides, this is a good excuse to start making this app your own.
>
>zettels = {
> root='id1',
> final=5,
> id1={
> data='this is zettel A\n\nit has some text',
> child='id3',
> next='id2',
> },
> id2={
> data='this is a sibling of zettel A at the top level',
> prev='id1',
> next='id5',
> },
> id3={
> data='this is zettel B, a child of A',
> parent='id1',
> next='id4',
> },
> id4={
> data='this is another child of zettel A, a sibling of B',
> parent='id1',
> prev='id3',
> },
> id5={
> data="(To clean up these sample zettels, hit ctrl-u and edit 'zettels')\n\nI don't yet trust any deletion feature I create to not mess up your data.\nBesides, this is a good excuse to start making this app your own.)",
> prev='id2',
> },
>}
- __teliva_timestamp:
>Thu Feb 10 20:24:13 2022
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'a,b,c', 'insert'},
> {'e', 'edit'},
> {'j,k,l,h', 'move'},
> {'x,X,y,Y', 'resize'},
> {'s', 'stash'},
> {'t', 'link with stash'},
>}
- __teliva_timestamp:
>Thu Feb 10 20:25:14 2022
stash:
>stash = nil
- __teliva_timestamp:
>Thu Feb 10 20:32:38 2022
update:
>function update(window)
> local key = window:getch()
> local h, w = window:getmaxyx()
> local curr = zettels[current_zettel_id]
> assert(curr, string.format('cursor fell off the edge of the world: %s', type(current_zettel_id)))
> -- move along the graph
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- move along the screen
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> -- mutations
> elseif key == string.byte('e') then
> editz(window)
> elseif key == string.byte('a') then
> -- insert sibling after
> local old = curr.next
> curr.next = new_id()
> local new = zettels[curr.next]
> new.data = ''
> new.next = old
> new.prev = current_zettel_id
> if old then
> zettels[old].prev = curr.next
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.next
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('b') then
> -- insert sibling before
> local old = curr.prev
> curr.prev = new_id()
> local new = zettels[curr.prev]
> new.data = ''
> new.prev = old
> new.next = current_zettel_id
> if old then
> zettels[old].next = curr.prev
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.prev
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('c') then
> -- insert child
> local old = curr.child
> curr.child = new_id()
> local new = zettels[curr.child]
> new.data = ''
> new.next = old
> if old then
> assert(zettels[old].prev == nil, "first child shouldn't have a previous sibling")
> zettels[old].prev = curr.child
> end
> new.parent = curr
> current_zettel_id = curr.child
> render(window) -- recompute render_state
> editz(window)
> -- cross-links
> elseif key == string.byte('s') then
> -- save zettel to a stash
> stash = current_zettel_id
> elseif key == string.byte('t') then
> -- cross-link a zettel bidirectionally with what's on the stash
> if curr.crosslinks then
> curr.crosslinks.a = stash
> else
> curr.crosslinks = {a=stash}
> end
> -- view settings
> elseif key == string.byte('x') then
> if view_settings.width > 5 then
> view_settings.width = view_settings.width - 5
> end
> elseif key == string.byte('X') then
> if view_settings.width < w-5 then
> view_settings.width = view_settings.width + 5
> end
> elseif key == string.byte('y') then
> if view_settings.height > 0 then
> view_settings.height = view_settings.height - 1
> end
> elseif key == string.byte('Y') then
> if view_settings.height < h-2 then
> view_settings.height = view_settings.height + 1
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 20:39:15 2022
render:
>function render(window)
> window:clear()
> local lines, cols = window:getmaxyx()
> local bg=1
> local y, x = 0, 0 -- units of characters (0-based)
> local w, h = 1, 1 -- units of zettels (1-based)
> -- render zettels depth-first, while tracking relative positions
> local done = {}
> local inprogress = {zettels.root}
> render_state.wh2id = {{}}
> while #inprogress > 0 do
> local currid = table.remove(inprogress)
> if not done[currid] then
> done[currid] = true
> table.insert(render_state.wh2id[w], currid)
> local zettel = zettels[currid]
> if currid == current_zettel_id then
> render_state.curr_w = w
> render_state.curr_h = h
> end
> local currbg = (currid == current_zettel_id) and view_settings.current_zettel_bg or bg
> render_zettel(window, currbg, depth(zettel) * view_settings.indent, y, x, zettel)
> if zettel.next then table.insert(inprogress, zettel.next) end
> if zettel.child then table.insert(inprogress, zettel.child) end
> if zettel.crosslinks then
> for relation, target in pairs(zettel.crosslinks) do
> table.insert(inprogress, target)
> end
> end
> bg = 3 - bg -- toggle between color pairs 1 and 2
> y = y + view_settings.height + view_settings.vmargin
> h = h + 1
> if y + view_settings.height > lines then
> y = 0
> h = 1
> x = x + view_settings.width + view_settings.hmargin
> w = w + 1
> if x + view_settings.width > cols then break end
> table.insert(render_state.wh2id, {})
> end
> end
> end
> window:mvaddstr(lines-1, 0, '')
> bg = 1
> x = 0
> for i=1,3 do
> local zettel = nil
> if i == 1 and stash then
> zettel = zettels[stash]
> end
> render_zettel(window, bg, 0, lines-1, x, zettel)
> bg = 3 - bg
> x = x + view_settings.width + view_settings.hmargin
> end
> window:refresh()
>end
- __teliva_timestamp:
>Thu Feb 10 20:40:08 2022
__teliva_note:
>initial support for cross-links
>
>Kinda confusing because zettels still show indent based on their
>hierarchical location rather than the path they're rendered in.
render_zettel:
>function render_zettel(window, bg, indent, starty, startx, zettel)
> window:attrset(curses.color_pair(bg))
> for y=0,view_settings.height-1 do
> for x=0,view_settings.width-1 do
> window:mvaddch(y+starty, x+startx, ' ')
> end
> end
> local y, x = 0, indent+1
> local data = ''
> if zettel then
> data = zettel.data
> end
> for i=1,#data do
> local c = data[i]
> if c == '\n' then
> y = y+1
> x = indent+1
> else
> window:mvaddstr(y+starty, x+startx, c)
> x = x+1
> if x >= startx + view_settings.width then
> y = y+1
> x = indent+1
> end
> end
> if y >= view_settings.height then
> break
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 20:44:29 2022
__teliva_note:
>looks better after dynamically recomputing depth while rendering
render:
>function render(window)
> window:clear()
> local lines, cols = window:getmaxyx()
> local bg=1
> local y, x = 0, 0 -- units of characters (0-based)
> local w, h = 1, 1 -- units of zettels (1-based)
> -- render zettels depth-first, while tracking relative positions
> local done = {}
> local inprogress = {{id=zettels.root,depth=0}}
> render_state.wh2id = {{}}
> while #inprogress > 0 do
> local curr = table.remove(inprogress)
> if not done[curr.id] then
> done[curr.id] = true
> table.insert(render_state.wh2id[w], curr.id)
> local zettel = zettels[curr.id]
> if curr.id == current_zettel_id then
> render_state.curr_w = w
> render_state.curr_h = h
> end
> local currbg = (curr.id == current_zettel_id) and view_settings.current_zettel_bg or bg
> render_zettel(window, currbg, curr.depth * view_settings.indent, y, x, zettel)
> if zettel.next then table.insert(inprogress, {id=zettel.next, depth=curr.depth}) end
> if zettel.child then table.insert(inprogress, {id=zettel.child, depth=curr.depth+1}) end
> if zettel.crosslinks then
> for relation, target in pairs(zettel.crosslinks) do
> table.insert(inprogress, {id=target, depth=curr.depth+1})
> end
> end
> bg = 3 - bg -- toggle between color pairs 1 and 2
> y = y + view_settings.height + view_settings.vmargin
> h = h + 1
> if y + view_settings.height > lines then
> y = 0
> h = 1
> x = x + view_settings.width + view_settings.hmargin
> w = w + 1
> if x + view_settings.width > cols then break end
> table.insert(render_state.wh2id, {})
> end
> end
> end
> window:mvaddstr(lines-1, 0, '')
> bg = 1
> x = 0
> for i=1,3 do
> local zettel = nil
> if i == 1 and stash then
> zettel = zettels[stash]
> end
> render_zettel(window, bg, 0, lines-1, x, zettel)
> bg = 3 - bg
> x = x + view_settings.width + view_settings.hmargin
> end
> window:refresh()
>end
- __teliva_timestamp:
>Thu Feb 10 20:55:19 2022
render_zettel:
>function render_zettel(window, bg, indent, edge_label, starty, startx, zettel)
> window:attrset(curses.color_pair(bg))
> for y=0,view_settings.height-1 do
> for x=0,view_settings.width-1 do
> window:mvaddch(y+starty, x+startx, ' ')
> end
> end
> if indent > 1 then
> window:attrset(curses.color_pair(bg+1)) -- go from zettel color to its edge color
> window:mvaddstr(starty, startx+indent-1, edge_label)
> window:attrset(curses.color_pair(bg))
> end
> local y, x = 0, indent+1
> local data = ''
> if zettel then
> data = zettel.data
> end
> for i=1,#data do
> local c = data[i]
> if c == '\n' then
> y = y+1
> x = indent+1
> else
> window:mvaddstr(y+starty, x+startx, c)
> x = x+1
> if x >= startx + view_settings.width then
> y = y+1
> x = indent+1
> end
> end
> if y >= view_settings.height then
> break
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 20:58:49 2022
view_settings:
>view_settings = {
> -- dimensions for rendering a single zettel; extra text gets truncated
> width=50,
> height=3,
> -- spacing between zettels
> hmargin=1,
> vmargin=1,
> --
> indent=2, -- how children of a zettel are indicated
>}
- __teliva_timestamp:
>Thu Feb 10 20:59:18 2022
render:
>function render(window)
> window:clear()
> local lines, cols = window:getmaxyx()
> local bg=3
> local y, x = 0, 0 -- units of characters (0-based)
> local w, h = 1, 1 -- units of zettels (1-based)
> -- render zettels depth-first, while tracking relative positions
> local done = {}
> local inprogress = {{id=zettels.root,depth=0,edge=''}}
> render_state.wh2id = {{}}
> while #inprogress > 0 do
> local curr = table.remove(inprogress)
> if not done[curr.id] then
> done[curr.id] = true
> table.insert(render_state.wh2id[w], curr.id)
> local zettel = zettels[curr.id]
> if curr.id == current_zettel_id then
> render_state.curr_w = w
> render_state.curr_h = h
> end
> local currbg = (curr.id == current_zettel_id) and 1 or bg -- 1 is the color pair for the current zettel
> render_zettel(window, currbg, curr.depth * view_settings.indent, curr.edge, y, x, zettel)
> if zettel.next then table.insert(inprogress, {id=zettel.next, depth=curr.depth, edge='|'}) end
> if zettel.child then table.insert(inprogress, {id=zettel.child, depth=curr.depth+1, edge='\\'}) end
> if zettel.crosslinks then
> for relation, target in pairs(zettel.crosslinks) do
> table.insert(inprogress, {id=target, depth=curr.depth+1, edge=relation})
> end
> end
> bg = 8 - bg -- toggle between color pairs 3 and 5
> y = y + view_settings.height + view_settings.vmargin
> h = h + 1
> if y + view_settings.height > lines then
> y = 0
> h = 1
> x = x + view_settings.width + view_settings.hmargin
> w = w + 1
> if x + view_settings.width > cols then break end
> table.insert(render_state.wh2id, {})
> end
> end
> end
> window:mvaddstr(lines-1, 0, '')
> bg = 3
> x = 0
> for i=1,3 do
> local zettel = nil
> if i == 1 and stash then
> zettel = zettels[stash]
> end
> render_zettel(window, bg, 0, '', lines-1, x, zettel)
> bg = 8 - bg -- toggle between color pairs 3 and 5
> x = x + view_settings.width + view_settings.hmargin
> end
> window:refresh()
>end
- __teliva_timestamp:
>Thu Feb 10 21:02:41 2022
__teliva_note:
>label the incoming edge for each zettel
>
>Is it a child, sibling or other cross-link?
init_colors:
>function init_colors()
> -- light background
> -- current zettel
> curses.init_pair(1, 236, 230)
> curses.init_pair(2, 1, 230) -- edge label for current zettel
> -- non-current zettel #1
> curses.init_pair(3, 236, 250)
> curses.init_pair(4, 1, 250) -- edge label for pair 3
> -- non-current zettel #2
> curses.init_pair(5, 236, 252)
> curses.init_pair(6, 1, 252) -- edge label for pair 5
> -- dark background
>--? -- current zettel
>--? curses.init_pair(7, 252, 130)
>--? -- other zettels
>--? curses.init_pair(1, 252, 240)
>--? curses.init_pair(2, 252, 242)
>--? -- edge labels
>--? curses.init_pair(3, 1, 240) -- same bg as pair 1
>--? curses.init_pair(4, 1, 242) -- same bg as pair 2
>--? curses.init_pair(9, 1, 130) -- same bg as pair 7 for current zettel
>end
- __teliva_timestamp:
>Thu Feb 10 21:11:35 2022
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'a,b,c', 'insert'},
> {'e', 'edit'},
> {'j,k,l,h', 'move'},
> {'x,X,y,Y', 'resize'},
> {'s', 'stash'},
> {'t', 'link with stash'},
> {'z', 'scroll'},
>}
- __teliva_timestamp:
>Thu Feb 10 21:13:19 2022
main:
>function main()
> init_colors()
> curses.curs_set(0) -- hide cursor except when editing
>
> local infile = io.open('zet', 'r')
> if infile then
> read_zettels(infile)
> end
> current_zettel_id = zettels.root -- cursor
> view_settings.first_zettel = zettels.root -- start rendering here
>
> while true do
> render(Window)
> update(Window)
>
> -- save zettels, but hold on to previous state on disk
> -- until last possible second
> local filename = os.tmpname()
> local outfile = io.open(filename, 'w')
> if outfile then
> write_zettels(outfile)
> os.rename(filename, 'zet')
> end
> end
>end
- __teliva_timestamp:
>Thu Feb 10 21:13:36 2022
render:
>function render(window)
> window:clear()
> local lines, cols = window:getmaxyx()
> local bg=3
> local y, x = 0, 0 -- units of characters (0-based)
> local w, h = 1, 1 -- units of zettels (1-based)
> -- render zettels depth-first, while tracking relative positions
> local done = {}
> local inprogress = {{id=view_settings.first_zettel,depth=0,edge=''}}
> render_state.wh2id = {{}}
> while #inprogress > 0 do
> local curr = table.remove(inprogress)
> if not done[curr.id] then
> done[curr.id] = true
> table.insert(render_state.wh2id[w], curr.id)
> local zettel = zettels[curr.id]
> if curr.id == current_zettel_id then
> render_state.curr_w = w
> render_state.curr_h = h
> end
> local currbg = (curr.id == current_zettel_id) and 1 or bg -- 1 is the color pair for the current zettel
> render_zettel(window, currbg, curr.depth * view_settings.indent, curr.edge, y, x, zettel)
> if zettel.next then table.insert(inprogress, {id=zettel.next, depth=curr.depth, edge='|'}) end
> if zettel.child then table.insert(inprogress, {id=zettel.child, depth=curr.depth+1, edge='\\'}) end
> if zettel.crosslinks then
> for relation, target in pairs(zettel.crosslinks) do
> table.insert(inprogress, {id=target, depth=curr.depth+1, edge=relation})
> end
> end
> bg = 8 - bg -- toggle between color pairs 3 and 5
> y = y + view_settings.height + view_settings.vmargin
> h = h + 1
> if y + view_settings.height > lines then
> y = 0
> h = 1
> x = x + view_settings.width + view_settings.hmargin
> w = w + 1
> if x + view_settings.width > cols then break end
> table.insert(render_state.wh2id, {})
> end
> end
> end
> window:mvaddstr(lines-1, 0, '')
> bg = 3
> x = 0
> for i=1,3 do
> local zettel = nil
> if i == 1 and stash then
> zettel = zettels[stash]
> end
> render_zettel(window, bg, 0, '', lines-1, x, zettel)
> bg = 8 - bg -- toggle between color pairs 3 and 5
> x = x + view_settings.width + view_settings.hmargin
> end
> window:refresh()
>end
- __teliva_timestamp:
>Thu Feb 10 21:19:26 2022
__teliva_note:
>bugfix: cross-links should be bidirectional
update:
>function update(window)
> local key = window:getch()
> local h, w = window:getmaxyx()
> local curr = zettels[current_zettel_id]
> assert(curr, string.format('cursor fell off the edge of the world: %s', type(current_zettel_id)))
> -- move along the graph
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- move along the screen
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> -- mutations
> elseif key == string.byte('e') then
> editz(window)
> elseif key == string.byte('a') then
> -- insert sibling after
> local old = curr.next
> curr.next = new_id()
> local new = zettels[curr.next]
> new.data = ''
> new.next = old
> new.prev = current_zettel_id
> if old then
> zettels[old].prev = curr.next
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.next
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('b') then
> -- insert sibling before
> local old = curr.prev
> curr.prev = new_id()
> local new = zettels[curr.prev]
> new.data = ''
> new.prev = old
> new.next = current_zettel_id
> if old then
> zettels[old].next = curr.prev
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.prev
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('c') then
> -- insert child
> local old = curr.child
> curr.child = new_id()
> local new = zettels[curr.child]
> new.data = ''
> new.next = old
> if old then
> assert(zettels[old].prev == nil, "first child shouldn't have a previous sibling")
> zettels[old].prev = curr.child
> end
> new.parent = curr
> current_zettel_id = curr.child
> render(window) -- recompute render_state
> editz(window)
> -- cross-links
> elseif key == string.byte('s') then
> -- save zettel to a stash
> stash = current_zettel_id
> elseif key == string.byte('t') then
> -- cross-link a zettel bidirectionally with what's on the stash
> local insert_crosslink =
> function(a, rel, b_id)
> if a.crosslinks == nil then
> a.crosslinks = {}
> end
> a.crosslinks[rel] = b_id
> end
> insert_crosslink(curr, 'a', stash)
> insert_crosslink(zettels[stash], 'a', current_zettel_id)
> -- view settings
> elseif key == string.byte('x') then
> if view_settings.width > 5 then
> view_settings.width = view_settings.width - 5
> end
> elseif key == string.byte('X') then
> if view_settings.width < w-5 then
> view_settings.width = view_settings.width + 5
> end
> elseif key == string.byte('y') then
> if view_settings.height > 0 then
> view_settings.height = view_settings.height - 1
> end
> elseif key == string.byte('Y') then
> if view_settings.height < h-2 then
> view_settings.height = view_settings.height + 1
> end
> elseif key == string.byte('z') then
> -- scroll to show the current zettel at top of screen
> -- often has the effect of zooming in on its hierarchy
> view_settings.first_zettel = current_zettel_id
> end
>end
- __teliva_timestamp:
>Thu Feb 10 21:20:45 2022
__teliva_note:
>clear stash after linking
update:
>function update(window)
> local key = window:getch()
> local h, w = window:getmaxyx()
> local curr = zettels[current_zettel_id]
> assert(curr, string.format('cursor fell off the edge of the world: %s', type(current_zettel_id)))
> -- move along the graph
> if key == string.byte('j') then
> if curr.child then
> current_zettel_id = curr.child
> elseif curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> elseif key == string.byte('k') then
> if curr.parent then current_zettel_id = curr.parent end
> elseif key == string.byte('h') then
> if curr.prev then
> current_zettel_id = curr.prev
> elseif curr.parent then
> current_zettel_id = curr.parent
> end
> elseif key == string.byte('l') then
> if curr.next then
> current_zettel_id = curr.next
> elseif curr.parent and zettels[curr.parent].next then
> current_zettel_id = zettels[curr.parent].next
> end
> -- move along the screen
> elseif key == curses.KEY_UP then
> if render_state.curr_h > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h - 1]
> end
> elseif key == curses.KEY_DOWN then
> if render_state.wh2id[render_state.curr_w][render_state.curr_h + 1] then
> current_zettel_id = render_state.wh2id[render_state.curr_w][render_state.curr_h + 1]
> end
> elseif key == curses.KEY_LEFT then
> if render_state.curr_w > 1 then
> current_zettel_id = render_state.wh2id[render_state.curr_w - 1][render_state.curr_h]
> end
> elseif key == curses.KEY_RIGHT then
> if render_state.wh2id[render_state.curr_w + 1] and render_state.wh2id[render_state.curr_w + 1][render_state.curr_h] then
> current_zettel_id = render_state.wh2id[render_state.curr_w + 1][render_state.curr_h]
> end
> -- mutations
> elseif key == string.byte('e') then
> editz(window)
> elseif key == string.byte('a') then
> -- insert sibling after
> local old = curr.next
> curr.next = new_id()
> local new = zettels[curr.next]
> new.data = ''
> new.next = old
> new.prev = current_zettel_id
> if old then
> zettels[old].prev = curr.next
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.next
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('b') then
> -- insert sibling before
> local old = curr.prev
> curr.prev = new_id()
> local new = zettels[curr.prev]
> new.data = ''
> new.prev = old
> new.next = current_zettel_id
> if old then
> zettels[old].next = curr.prev
> assert(curr.parent == zettels[old].parent, 'siblings should have same parent')
> end
> new.parent = curr.parent
> current_zettel_id = curr.prev
> render(window) -- recompute render_state
> editz(window)
> elseif key == string.byte('c') then
> -- insert child
> local old = curr.child
> curr.child = new_id()
> local new = zettels[curr.child]
> new.data = ''
> new.next = old
> if old then
> assert(zettels[old].prev == nil, "first child shouldn't have a previous sibling")
> zettels[old].prev = curr.child
> end
> new.parent = curr
> current_zettel_id = curr.child
> render(window) -- recompute render_state
> editz(window)