monotonically accumulate versions of definitions

One old drawback now has a new look. Before, we loaded definitions in
order, so global definitions had to exist before other global
definitions that used them. See window and grid in life.tlv. Now we load
definitions in reverse order, so initialization needs to change. Worse,
if we update window, we need to edit grid just to fix the order.

This implies that we can't yet optimize away bindings where there are no
new changes.

1 files changed, 37 insertions, 5 deletions

diff --git a/life.tlv b/life.tlv
index 8a3f9d4..b0e5500 100644
--- a/life.tlv
+++ b/life.tlv
@@ -1,9 +1,5 @@
 teliva_program = {
-    window = [==[
-window = curses.stdscr()
--- animation-based app
-window:nodelay(true)
-lines, cols = window:getmaxyx()]==],
+  {
     grid = [==[
 -- main data structure
 grid = {}
@@ -14,6 +10,15 @@ for i=1,lines*4 do
   end
 end
 ]==],
+  },
+  {
+    window = [==[
+window = curses.stdscr()
+-- animation-based app
+window:nodelay(true)
+lines, cols = window:getmaxyx()]==],
+  },
+  {
     grid_char = [==[
 -- grab a 4x2 chunk of grid
 function grid_char(line, col)
@@ -23,6 +28,8 @@ function grid_char(line, col)
   end
   return result
 end]==],
+  },
+  {
     print_grid_char = [==[
 function print_grid_char(window, x)
   result = {}
@@ -33,6 +40,8 @@ function print_grid_char(window, x)
   end
   return result
 end]==],
+  },
+  {
     glyph = [==[
 -- look up the braille pattern corresponding to a 4x2 chunk of grid
 -- https://en.wikipedia.org/wiki/Braille_Patterns
@@ -56,6 +65,8 @@ glyph = {
   0x28b0, 0x28b1, 0x28b2, 0x28b3, 0x28b4, 0x28b5, 0x28b6, 0x28b7,   0x28f0, 0x28f1, 0x28f2, 0x28f3, 0x28f4, 0x28f5, 0x28f6, 0x28f7,
   0x28b8, 0x28b9, 0x28ba, 0x28bb, 0x28bc, 0x28bd, 0x28be, 0x28bf,   0x28f8, 0x28f9, 0x28fa, 0x28fb, 0x28fc, 0x28fd, 0x28fe, 0x28ff,
 }]==],
+  },
+  {
     utf8 = [==[
 -- https://stackoverflow.com/questions/7983574/how-to-write-a-unicode-symbol-in-lua
 function utf8(decimal)
@@ -75,6 +86,8 @@ function utf8(decimal)
   end
   return table.concat(charbytes)
 end]==],
+  },
+  {
     grid_char_to_glyph_index = [==[
 -- convert a chunk of grid into a number
 function grid_char_to_glyph_index(g)
@@ -82,6 +95,8 @@ function grid_char_to_glyph_index(g)
          g[1][2]*16 + g[2][2]*32 + g[3][2]*64 + g[4][2]*128 +
          1  -- 1-indexing
 end]==],
+  },
+  {
     render = [==[
 function render(window)
   window:clear()
@@ -93,6 +108,8 @@ function render(window)
   curses.refresh()
 end
 ]==],
+  },
+  {
     state = [==[
 function state(line, col)
   if line < 1 or line > table.getn(grid) or col < 1 or col > table.getn(grid[1]) then
@@ -100,12 +117,16 @@ function state(line, col)
   end
   return grid[line][col]
 end]==],
+  },
+  {
     num_live_neighbors = [==[
 function num_live_neighbors(line, col)
   return state(line-1, col-1) + state(line-1, col) + state(line-1, col+1) +
          state(line,   col-1) +                      state(line,   col+1) +
          state(line+1, col-1) + state(line+1, col) + state(line+1, col+1)
 end]==],
+  },
+  {
     step = [==[
 function step()
   local new_grid = {}
@@ -124,12 +145,16 @@ function step()
   end
   grid = new_grid
 end]==],
+  },
+  {
     sleep = [==[
 function sleep(a)
     local sec = tonumber(os.clock() + a);
     while (os.clock() < sec) do
     end
 end]==],
+  },
+  {
     file_exists = [==[
 function file_exists(filename)
   local f = io.open(filename, "r")
@@ -140,6 +165,8 @@ function file_exists(filename)
     return false
   end
 end]==],
+  },
+  {
     load_file = [==[
 function load_file(window, filename)
   io.input(filename)
@@ -160,6 +187,8 @@ function load_file(window, filename)
     end
   end
 end]==],
+  },
+  {
     update = [==[
 menu = {arrow="pan"}
 
@@ -198,6 +227,8 @@ function update(window, c)
     end
   end
 end]==],
+  },
+  {
     main = [==[
 function main()
   for i=1,7 do
@@ -274,4 +305,5 @@ function main()
     step()
   end
 end]==],
+  },
 }