500 lines
15 KiB
Lua
500 lines
15 KiB
Lua
# .tlv file generated by https://github.com/akkartik/teliva
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# You may edit it if you are careful; however, you may see cryptic errors if you
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# violate Teliva's assumptions.
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#
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# .tlv files are representations of Teliva programs. Teliva programs consist of
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# sequences of definitions. Each definition is a table of key/value pairs. Keys
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# and values are both strings.
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#
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# Lines in .tlv files always follow exactly one of the following forms:
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# - comment lines at the top of the file starting with '#' at column 0
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# - beginnings of definitions starting with '- ' at column 0, followed by a
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# key/value pair
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# - key/value pairs consisting of ' ' at column 0, containing either a
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# spaceless value on the same line, or a multi-line value
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# - multiline values indented by more than 2 spaces, starting with a '>'
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#
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# If these constraints are violated, Teliva may unceremoniously crash. Please
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# report bugs at http://akkartik.name/contact
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- __teliva_timestamp: original
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str_helpers:
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>-- some string helpers from http://lua-users.org/wiki/StringIndexing
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>
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>-- index characters using []
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>getmetatable('').__index = function(str,i)
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> if type(i) == 'number' then
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> return string.sub(str,i,i)
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> else
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> return string[i]
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> end
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>end
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>
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>-- ranges using (), selected bytes using {}
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>getmetatable('').__call = function(str,i,j)
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> if type(i)~='table' then
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> return string.sub(str,i,j)
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> else
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> local t={}
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> for k,v in ipairs(i) do
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> t[k]=string.sub(str,v,v)
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> end
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> return table.concat(t)
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> end
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>end
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>
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>-- iterate over an ordered sequence
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>function q(x)
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> if type(x) == 'string' then
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> return x:gmatch('.')
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> else
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> return ipairs(x)
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> end
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>end
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>
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>-- insert within string
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>function string.insert(str1, str2, pos)
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> return str1:sub(1,pos)..str2..str1:sub(pos+1)
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>end
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>
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>function string.remove(s, pos)
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> return s:sub(1,pos-1)..s:sub(pos+1)
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>end
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>
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>-- TODO: backport utf-8 support from Lua 5.3
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- __teliva_timestamp: original
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debugy:
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>debugy = 5
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- __teliva_timestamp: original
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dbg:
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>-- helper for debug by print; overlay debug information towards the right
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>-- reset debugy every time you refresh screen
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>function dbg(window, s)
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> local oldy = 0
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> local oldx = 0
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> oldy, oldx = window:getyx()
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> window:mvaddstr(debugy, 60, s)
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> debugy = debugy+1
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> window:mvaddstr(oldy, oldx, '')
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>end
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- __teliva_timestamp: original
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check_eq:
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>function check_eq(x, expected, msg)
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> if x == expected then
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> curses.addch('.')
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> else
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> print('F - '..msg)
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> print(' expected '..tostring(expected)..' but got '..x)
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> teliva_num_test_failures = teliva_num_test_failures + 1
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> -- overlay first test failure on editors
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> if teliva_first_failure == nil then
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> teliva_first_failure = msg
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> end
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> end
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>end
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- __teliva_timestamp: original
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map:
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>-- only for arrays
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>function map(l, f)
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> result = {}
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> for _, x in ipairs(l) do
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> table.insert(result, f(x))
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> end
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> return result
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>end
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- __teliva_timestamp: original
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reduce:
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>-- only for arrays
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>function reduce(l, f, init)
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> result = init
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> for _, x in ipairs(l) do
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> result = f(result, x)
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> end
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> return result
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>end
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- __teliva_timestamp: original
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filter:
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>-- only for arrays
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>function filter(l, f)
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> result = {}
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> for _, x in ipairs(l) do
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> if f(x) then
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> table.insert(result, x)
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> end
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> end
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> return result
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>end
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- __teliva_timestamp: original
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find_index:
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>function find_index(arr, x)
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> for n, y in ipairs(arr) do
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> if x == y then
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> return n
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> end
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> end
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>end
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- __teliva_timestamp: original
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trim:
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>function trim(s)
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> return s:gsub('^%s*', ''):gsub('%s*$', '')
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>end
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- __teliva_timestamp: original
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split:
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>function split(s, d)
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> result = {}
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> for match in (s..d):gmatch("(.-)"..d) do
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> table.insert(result, match);
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> end
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> return result
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>end
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- __teliva_timestamp: original
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append:
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>function append(target, src)
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> for _, line in ipairs(src) do
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> table.insert(target, line)
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> end
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>end
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- __teliva_timestamp: original
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clear:
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>function clear(lines)
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> while #lines > 0 do
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> table.remove(lines)
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> end
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>end
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- __teliva_timestamp: original
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zap:
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>function zap(target, src)
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> clear(target)
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> append(target, src)
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>end
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- __teliva_timestamp: original
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window:
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>window = curses.stdscr()
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- __teliva_timestamp: original
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render_line:
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>function render_line(window, y, line)
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> window:mvaddstr(y, 0, '')
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> for i=1,string.len(line) do
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> window:addstr(line[i])
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> end
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>end
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- __teliva_timestamp: original
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render_link:
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>function render_link(window, y, line)
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> local rendered_line = string.gsub(line, '=>%s*%S*%s*', '')
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> if trim(rendered_line) == '' then
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> rendered_line = line
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> end
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> render_line(window, y, rendered_line)
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>end
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- __teliva_timestamp: original
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state:
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>state = {
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> lines={},
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> history={},
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> highlight_index=0,
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> source=false, -- show source (link urls, etc.)
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>}
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- __teliva_timestamp: original
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render_page:
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>function render_page(window)
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> local y = 0
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> window:attron(curses.color_pair(6))
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> print(state.url)
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> window:attroff(curses.color_pair(6))
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> y = y+2
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>--? dbg(window, state.highlight_index)
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> for i, line in pairs(state.lines) do
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> if not state.source and string.find(line, '=> ') == 1 then
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> if state.highlight_index == 0 or i == state.highlight_index then
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> -- highlighted link
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> state.highlight_index = i -- TODO: ugly state update while rendering, just for first render after gemini_get
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> curses.attron(curses.A_REVERSE)
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> render_link(window, y, line)
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> curses.attroff(curses.A_REVERSE)
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> else
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> -- link
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> curses.attron(curses.A_BOLD)
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> render_link(window, y, line)
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> curses.attroff(curses.A_BOLD)
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> end
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> else
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> -- non-link
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> render_line(window, y, line)
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> end
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> y = y+1
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> end
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>end
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- __teliva_timestamp: original
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render:
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>function render(window, lines)
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> window:clear()
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> render_page(window, lines)
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> curses.curs_set(0)
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> window:refresh()
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>end
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- __teliva_timestamp: original
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menu:
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>menu = {
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> {'Enter', 'go to highlight'},
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> {'<-', 'back'},
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> {'^g', 'enter url'},
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> {'^u', 'view source'},
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>}
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- __teliva_timestamp: original
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edit_line:
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>function edit_line(window)
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> local result = ''
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> local cursor = 1
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> local screen_rows, screen_cols = window:getmaxyx()
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> while true do
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> window:mvaddstr(screen_rows-1, 9, '')
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> window:clrtoeol()
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> window:mvaddstr(screen_rows-1, 9, result)
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> window:attron(curses.A_REVERSE)
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> -- window:refresh()
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> local key = curses.getch()
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> window:attrset(curses.A_NORMAL)
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> if key >= 32 and key < 127 then
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> local screen_rows, screen_cols = window:getmaxyx()
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> if #result < screen_cols then
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> result = result:insert(string.char(key), cursor-1)
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> cursor = cursor+1
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> end
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> elseif key == curses.KEY_LEFT then
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> if cursor > 1 then
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> cursor = cursor-1
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> end
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> elseif key == curses.KEY_RIGHT then
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> if cursor <= #result then
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> cursor = cursor+1
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> end
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> elseif key == curses.KEY_BACKSPACE then
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> if cursor > 1 then
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> cursor = cursor-1
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> result = result:remove(cursor)
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> end
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> elseif key == 21 then -- ctrl-u
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> result = ''
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> cursor = 1
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> elseif key == 10 then -- enter
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> return result
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> elseif key == 24 then -- ctrl-x
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> return nil
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> end
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> end
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>end
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- __teliva_timestamp: original
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is_link:
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>function is_link(line)
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> return string.find(line, '=>%s*%S*%s*') == 1
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>end
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- __teliva_timestamp: original
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next_link:
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>function next_link()
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> local new_index = state.highlight_index
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> while true do
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> new_index = new_index+1
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> if new_index > #state.lines then return end
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> if is_link(state.lines[new_index]) then break end
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> end
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> state.highlight_index = new_index
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>end
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- __teliva_timestamp: original
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previous_link:
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>function previous_link()
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> local new_index = state.highlight_index
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> while true do
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> new_index = new_index - 1
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> if new_index < 1 then return end
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> if is_link(state.lines[new_index]) then break end
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> end
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> state.highlight_index = new_index
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>end
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- __teliva_timestamp: original
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update:
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>function update(window)
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> local key = curses.getch()
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> local screen_rows, screen_cols = window:getmaxyx()
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> if key == 258 then -- down arrow
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> next_link()
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> elseif key == 259 then -- up arrow
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> previous_link()
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> elseif key == 260 then -- left arrow
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> if #state.history > 1 then
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> table.remove(state.history)
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> gemini_get(table.remove(state.history))
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> end
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> elseif key == 21 then -- ctrl-u
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> state.source = not state.source
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> elseif key == 10 then -- enter
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> local s, e, new_url = string.find(state.lines[state.highlight_index], '=>%s*(%S*)')
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> gemini_get(url.absolute(state.url, new_url))
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> elseif key == 7 then -- ctrl-g
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> window:mvaddstr(screen_rows-2, 0, '')
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> window:clrtoeol()
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> window:mvaddstr(screen_rows-1, 0, '')
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> window:clrtoeol()
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> window:mvaddstr(screen_rows-1, 5, 'go: ')
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> curses.curs_set(2)
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> local new_url = edit_line(window)
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> if new_url then
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> state.url = new_url
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> gemini_get(new_url)
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> end
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> curses.curs_set(0)
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> end
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>end
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- __teliva_timestamp: original
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init_colors:
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>function init_colors()
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> for i=0,7 do
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> curses.init_pair(i, i, -1)
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> end
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> curses.init_pair(8, 7, 0)
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> curses.init_pair(9, 7, 1)
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> curses.init_pair(10, 7, 2)
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> curses.init_pair(11, 7, 3)
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> curses.init_pair(12, 7, 4)
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> curses.init_pair(13, 7, 5)
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> curses.init_pair(14, 7, 6)
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> curses.init_pair(15, -1, 15)
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>end
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- __teliva_timestamp: original
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main:
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>function main()
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> init_colors()
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> local lines = {}
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> local url = ''
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> if #arg > 0 then
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> state.url = arg[1]
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> lines = gemini_get(state.url)
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> end
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> while true do
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> render(window, lines)
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> update(window, lines)
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> end
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>end
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- __teliva_timestamp: original
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http_get:
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>function http_get(url)
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> -- https://stackoverflow.com/questions/42445423/luasocket-serveraccept-timeout-tcp
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> local parsed_url = socket.url.parse(url)
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> local tcp = socket.tcp()
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> tcp:connect(parsed_url.host, 80)
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> tcp:send('GET / HTTP/1.1\r\n')
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> -- http requires the Host header
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> tcp:send(string.format('Host: %s\r\n', parsed_url.host))
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> tcp:send('\r\n')
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> -- tcp:receive('*a') doesn't seem to detect when a request is done
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> -- so we have to manage the size of the expected response
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> headers = {}
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> while true do
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> local s, status = tcp:receive()
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> if s == nil then break end
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> if s == '' then break end
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> local header, value = string.match(s, '(.-): (.*)')
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> if header == nil then
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> print(s)
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> else
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> headers[string.lower(header)] = value
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> print(header, value)
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> end
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> end
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> local bytes_remaining = tonumber(headers['content-length'])
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> body = ''
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> while true do
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> local s, status = tcp:receive(bytes_remaining)
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> if s == nil then break end
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> body = body .. s
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> bytes_remaining = bytes_remaining - string.len(s)
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> if bytes_remaining <= 0 then break end
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> end
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> return body
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>end
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- __teliva_timestamp: original
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https_get:
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>-- http://notebook.kulchenko.com/programming/https-ssl-calls-with-lua-and-luasec
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>function https_get(url)
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> local parsed_url = socket.url.parse(url)
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> local params = {
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> mode = 'client',
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> protocol = 'any',
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> verify = 'none', -- I don't know what I'm doing
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> options = 'all',
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> }
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> local conn = socket.tcp()
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> conn:connect(parsed_url.host, parsed_url.port or 443)
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> conn, err = ssl.wrap(conn, params)
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> if conn == nil then
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> io.write(err)
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> os.exit(1)
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> end
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> conn:dohandshake()
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>
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> conn:send(url .. "\r\n")
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> local line, err = conn:receive()
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> return line or err
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>end
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- __teliva_timestamp: original
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parse_gemini_body:
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>function parse_gemini_body(conn, type)
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> if type == 'text/gemini' then
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> while true do
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> local line, err = conn:receive()
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> if line == nil then break end
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> table.insert(state.lines, line)
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> end
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> elseif string.sub(type, 1, 5) == 'text/' then
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> while true do
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> local line, err = conn:receive()
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> if line == nil then break end
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> table.insert(state.lines, line)
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> end
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> end
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>end
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- __teliva_timestamp: original
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gemini_get:
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>-- http://notebook.kulchenko.com/programming/https-ssl-calls-with-lua-and-luasec
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>-- https://tildegit.org/solderpunk/gemini-demo-2
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>-- returns an array of lines, containing either the body or just an error
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>function gemini_get(url)
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> if string.find(url, "://") == nil then
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> url = "gemini://" .. url
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> end
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> local parsed_url = socket.url.parse(url)
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> local params = {
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> mode = 'client',
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> protocol = 'any',
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> verify = 'none', -- I don't know what I'm doing
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> options = 'all',
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> }
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> local conn = socket.tcp()
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> conn:connect(parsed_url.host, parsed_url.port or 1965)
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> conn, err = ssl.wrap(conn, params)
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> if conn == nil then
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> io.write(err)
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> os.exit(1)
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> end
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> conn:dohandshake()
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> conn:send(url .. "\r\n")
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> clear(state.lines)
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> state.highlight_index = 0 -- highlighted link not computed yet
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> local line, err = conn:receive()
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> if line == nil then
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> table.insert(state.lines, err)
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> return
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> end
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> local status, meta = string.match(line, "(%S+) (%S+)")
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> if status[1] == '2' then
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> parse_gemini_body(conn, meta)
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> state.url = url
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> table.insert(state.history, url)
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> elseif status[1] == '3' then
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> gemini_get(socket.url.absolute(url, meta))
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> elseif status[1] == '4' or line[1] == '5' then
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> table.insert(state.lines, 'Error: '..meta)
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> else
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> table.insert(state.lines, 'invalid response from server: '..line)
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> end
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>end
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