bash-autocomplete.sh

# 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 manually.
 _init_completion -n 2> /dev/null
if [[ "$?"!= 0 ]];then
 COMPREPLY=()
 cword=$COMP_CWORD
 cur="${COMP_WORDS[$cword]}"
fi

 w1="${COMP_WORDS[$cword - 1]}"
if [[ $cword> 1 ]];then
 w2="${COMP_WORDS[$cword - 2]}"
fi

# Pass all the current command-line flags to clang, so that clang can handle
# these internally.
# '=' is separated differently by bash, so we have to concat them without ','
foriin`seq 1 $cword`;do
if [[ $i==$cword||"${COMP_WORDS[$(($i+1))]}"=='=' ]];then
 arg="$arg${COMP_WORDS[$i]}"
else
 arg="$arg${COMP_WORDS[$i]},"
fi
done

# expand ~ to $HOME
evallocal path=${COMP_WORDS[0]}
# Use $'\t' so that bash expands the \t for older versions of sed.
 flags=$("$path" --autocomplete="$arg"2>/dev/null | sed -e $'s/\t.*//')
# If clang is old that it does not support --autocomplete,
# fall back to the filename completion.
if [[ "$?"!= 0 ]];then
 _clang_filedir
return
fi

# When clang does not emit any possible autocompletion, or user pushed tab after " ",
# just autocomplete files.
if [[ "$flags"=="$(echo -e '\n')" ]];then
# If -foo=<tab> and there was no possible values, autocomplete files.
 [[ "$cur"=='='||"$cur"== -*= ]] && cur=""
 _clang_filedir
elif [[ "$cur"=='=' ]];then
 COMPREPLY=( $(compgen -W "$flags" -- "") )
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