stop pretending globals are local

One advantage of this approach: we don't end up with multiple lexical
scopes containing duplicates of the same modules.

drawing.lua

@@ -1,7 +1,5 @@
 -- primitives for editing drawings
 Drawing = {}
-geom = require 'geom'
-
 require 'drawing_tests'
 
 -- All drawings span 100% of some conceptual 'page width' and divide it up
@@ -719,5 +717,3 @@ function table.find(h, x)
     end
   end
 end
-
-return Drawing

file.lua

@@ -1,6 +1,4 @@
 -- primitives for saving to file and loading from file
-Drawing = require 'drawing'
-
 function load_from_disk(filename)
   local infile = App.open_for_reading(filename)
   local result = load_from_file(infile)

geom.lua

@@ -1,4 +1,4 @@
-local geom = {}
+geom = {}
 
 function geom.on_shape(x,y, drawing, shape)
   if shape.mode == 'freehand' then
@@ -166,5 +166,3 @@ function geom.angle_between(ox,oy, x,y, s,e)
 end
 
 function geom.dist(x1,y1, x2,y2) return ((x2-x1)^2+(y2-y1)^2)^0.5 end
-
-return geom

main.lua

@@ -1,4 +1,4 @@
-local utf8 = require 'utf8'
+utf8 = require 'utf8'
 
 require 'app'
 require 'test'
@@ -6,9 +6,9 @@ require 'test'
 require 'keychord'
 require 'file'
 require 'button'
-local Text = require 'text'
-local Drawing = require 'drawing'
-local geom = require 'geom'
+require 'text'
+require 'drawing'
+require 'geom'
 require 'help'
 require 'icons'
 

select.lua

@@ -1,7 +1,5 @@
 -- helpers for selecting portions of text
 
-local utf8 = require 'utf8'
-
 -- Return any intersection of the region from Selection1 to Cursor1 (or
 -- current mouse, if mouse is pressed; or recent mouse if mouse is pressed and
 -- currently over a drawing) with the region between {line=line_index, pos=apos}

text.lua

@@ -1,8 +1,6 @@
 -- text editor, particularly text drawing, horizontal wrap, vertical scrolling
 Text = {}
 
-local utf8 = require 'utf8'
-
 require 'search'
 require 'select'
 require 'undo'
@@ -1010,5 +1008,3 @@ function Text.clear_cache(line)
   line.fragments = nil
   line.screen_line_starting_pos = nil
 end
-
-return Text