generators: separate source generators from scripts

src/nvim/generators/gen_char_blob.lua

@@ -0,0 +1,48 @@
+if arg[1] == '--help' then
+  print('Usage:')
+  print('  gencharblob.lua source target varname')
+  print('')
+  print('Generates C file with big uint8_t blob.')
+  print('Blob will be stored in a static const array named varname.')
+  os.exit()
+end
+
+assert(#arg == 3)
+
+local source_file = arg[1]
+local target_file = arg[2]
+local varname = arg[3]
+
+source = io.open(source_file, 'r')
+target = io.open(target_file, 'w')
+
+target:write('#include <stdint.h>\n\n')
+target:write(('static const uint8_t %s[] = {\n'):format(varname))
+
+num_bytes = 0
+MAX_NUM_BYTES = 15  -- 78 / 5: maximum number of bytes on one line
+target:write(' ')
+
+increase_num_bytes = function()
+  num_bytes = num_bytes + 1
+  if num_bytes == MAX_NUM_BYTES then
+    num_bytes = 0
+    target:write('\n ')
+  end
+end
+
+for line in source:lines() do
+  for i = 1,string.len(line) do
+    byte = string.byte(line, i)
+    assert(byte ~= 0)
+    target:write(string.format(' %3u,', byte))
+    increase_num_bytes()
+  end
+  target:write(string.format(' %3u,', string.byte('\n', 1)))
+  increase_num_bytes()
+end
+
+target:write('   0};\n')
+
+source:close()
+target:close()