Add multibyte support.

Increased vim.js compiled size from 25MB to 44MB.
It is disabled by default.
Uses builtin emscripten UTF8 functions.

Author: emnh

build.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 set -e
-[ -z $EM_DIR] && EM_DIR=~/src/emscripten
+[ -z "$EM_DIR" ] && EM_DIR=~/src/emscripten
 
 do_config() {
     echo config

web/usr/local/share/vim/vimrc

@@ -55,6 +55,8 @@ set wildmenu
 set tabstop=4
 set expandtab
 set nocompatible
+set encoding=utf8
+set termencoding=utf8
 set fileencodings=utf8
 set backspace=indent,eol,start
 set wildmode=longest,list,full

web/vim_lib.js

@@ -91,8 +91,19 @@ var LibraryVIM = {
         } 
       }
 
-      if(!handled)
-        vimjs.gui_web_handle_key(charCode || keyCode, modifiers, 0, 0);
+      if(!handled) {
+        var MAX_UTF8_BYTES = 6;
+        var chars = new Uint8Array(MAX_UTF8_BYTES + 1); // null-terminated
+        var charLen = stringToUTF8Array(String.fromCharCode(charCode), chars, 0, MAX_UTF8_BYTES);
+        if (charLen == 1) {
+          vimjs.gui_web_handle_key(chars[0], modifiers, 0, 0);
+        } else {
+          // no modifers for UTF-8, should be handled in chars already
+          for (var i = 0; i < charLen; i++) {
+            vimjs.gui_web_handle_key(chars[i], 0, 0, 0);
+          }
+        }
+      }
 
     },//VIMJS_FOLD_END
 
@@ -778,7 +789,15 @@ var LibraryVIM = {
   },
 
   vimjs_draw_string__deps: ['vimjs_clear_block'],
-  vimjs_draw_string: function(row, col, s, len, flags) {
+  vimjs_draw_string: function(row, col, s_ptr, len, flags) {
+    var byteArray = [];
+    for (var i = 0; i < len; i++) {
+      c = getValue(s_ptr + i, 'i8', true);
+      byteArray.push(c);
+    }
+    byteArray.push(0);
+    var s = UTF8ArrayToString(byteArray, 0);
+    len = s.length;
 
     // TODO: use macros for flag constants
     if(!(flags & 0x01)) {
@@ -788,8 +807,6 @@ var LibraryVIM = {
     var font = vimjs.font;
     if(flags & 0x02) font = 'bold ' + font;
 
-    s = Pointer_stringify(s, len);
-
     var ctx = vimjs.canvas_ctx;
 
     ctx.font = font;