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# Please add "source /path/to/bash-autocomplete.sh" to your .bashrc to use this.
_clang_filedir()
{
# _filedir function provided by recent versions of bash-completion package is
# better than "compgen -f" because the former honors spaces in pathnames while
# the latter doesn't. So we use compgen only when _filedir is not provided.
_filedir 2> /dev/null || COMPREPLY=( $( compgen -f ) )
}
_clang()
{
local cur prev words cword arg flags w1 w2
# If latest bash-completion is not supported just initialize COMPREPLY and
# initialize variables by setting manualy.
_init_completion -n 2> /dev/null
if [[ "$?" != 0 ]]; then
COMPREPLY=()
cword=$COMP_CWORD
cur="${COMP_WORDS[$cword]}"
fi
# bash always separates '=' as a token even if there's no space before/after '='.
# On the other hand, '=' is just a regular character for clang options that
# contain '='. For example, "-stdlib=" is defined as is, instead of "-stdlib" and "=".
# So, we need to partially undo bash tokenization here for integrity.
w1="${COMP_WORDS[$cword - 1]}"
if [[ $cword > 1 ]]; then
w2="${COMP_WORDS[$cword - 2]}"
fi
if [[ "$cur" == -* ]]; then
# -foo<tab>
arg="$cur"
elif [[ "$w1" == -* && "$cur" == '=' ]]; then
# -foo=<tab>
arg="$w1=,"
elif [[ "$cur" == -*= ]]; then
# -foo=<tab>
arg="$cur,"
elif [[ "$w1" == -* ]]; then
# -foo <tab> or -foo bar<tab>
arg="$w1,$cur"
elif [[ "$w2" == -* && "$w1" == '=' ]]; then
# -foo=bar<tab>
arg="$w2=,$cur"
elif [[ ${cur: -1} != '=' && ${cur/=} != $cur ]]; then
# -foo=bar<tab>
arg="${cur%=*}=,${cur#*=}"
fi
# expand ~ to $HOME
eval local path=${COMP_WORDS[0]}
flags=$( "$path" --autocomplete="$arg" 2>/dev/null )
# If clang is old that it does not support --autocomplete,
# fall back to the filename completion.
if [[ "$?" != 0 ]]; then
_clang_filedir
return
fi
if [[ "$cur" == '=' ]]; then
COMPREPLY=( $( compgen -W "$flags" -- "") )
elif [[ "$flags" == "" || "$arg" == "" ]]; then
_clang_filedir
else
# Bash automatically appends a space after '=' by default.
# Disable it so that it works nicely for options in the form of -foo=bar.
[[ "${flags: -1}" == '=' ]] && compopt -o nospace 2> /dev/null
COMPREPLY=( $( compgen -W "$flags" -- "$cur" ) )
fi
}
complete -F _clang clang
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