CodeMirror: Vim bindings demo

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#include "syscalls.h"
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/* getchar:  simple buffered version */
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int getchar(void)
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{
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  static char buf[BUFSIZ];
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  static char *bufp = buf;
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  static int n = 0;
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  if (n == 0) {  /* buffer is empty */
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    n = read(0, buf, sizeof buf);
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    bufp = buf;
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  }
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  return (--n >= 0) ? (unsigned char) *bufp++ : EOF;
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}
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The vim keybindings are enabled by including keymap/vim.js and setting the keyMap option to "vim". Because CodeMirror's internal API is quite different from Vim, they are only a loose approximation of actual vim bindings, though.