src/v8/tools/bash-completion.sh

#!/bin/bash
# Copyright 2012 the V8 project authors. All rights reserved.
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# Inspired by and based on:
# http://src.chromium.org/viewvc/chrome/trunk/src/tools/bash-completion

# Flag completion rule for bash.
# To load in your shell, "source path/to/this/file".

v8_source=$(readlink -f $(dirname $BASH_SOURCE)/..)

_v8_flag() {
  local cur defines targets
  cur="${COMP_WORDS[COMP_CWORD]}"
  defines=$(cat $v8_source/src/flag-definitions.h \
    | grep "^DEFINE" \
    | grep -v "DEFINE_IMPLICATION" \
    | sed -e 's/_/-/g'; \
    cat $v8_source/src/flag-definitions.h \
    | grep "^  V(harmony_" \
    | sed -e 's/^  V/DEFINE-BOOL/' \
    | sed -e 's/_/-/g')
  targets=$(echo "$defines" \
    | sed -ne 's/^DEFINE-[^(]*(\([^,]*\).*/--\1/p'; \
    echo "$defines" \
    | sed -ne 's/^DEFINE-BOOL(\([^,]*\).*/--no\1/p'; \
    cat $v8_source/src/d8.cc \
    | grep "strcmp(argv\[i\]" \
    | sed -ne 's/^[^"]*"--\([^"]*\)".*/--\1/p')
  COMPREPLY=($(compgen -W "$targets" -- "$cur"))
  return 0
}

complete -F _v8_flag -f d8