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[Bash-autocompletion] Add support for older bash version.

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Summary:
OS X seems to use older bash version which doesn't suport
_init_completion and compopt, so add support for this.

Reviewers: ruiu, v.g.vassilev, teemperor

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D34924

llvm-svn: 306962
This commit is contained in:
Yuka Takahashi 2017-07-01 18:32:55 +00:00
parent 3bad6f3167
commit 4776cb072f
1 changed files with 25 additions and 7 deletions
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32
clang/utils/bash-autocomplete.sh
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@ -1,15 +1,33 @@
# 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=( $( compgen -f ) )
}
_clang()
{
local cur prev words cword arg flags
_init_completion -n : || return
local cur prev words cword arg flags w1 w2
# If latest bash-completion is not supported just initialize COMPREPLY and
# initialize variables by setting manualy.
_init_completion -n 2> /dev/null
if [[ "$?" != 0 ]]; then
COMPREPLY=()
cword=$COMP_CWORD
cur="${COMP_WORDS[$cword]}"
fi
# bash always separates '=' as a token even if there's no space before/after '='.
# On the other hand, '=' is just a regular character for clang options that
# contain '='. For example, "-stdlib=" is defined as is, instead of "-stdlib" and "=".
# So, we need to partially undo bash tokenization here for integrity.
local w1="${COMP_WORDS[$cword - 1]}"
local w2="${COMP_WORDS[$cword - 2]}"
w1="${COMP_WORDS[$cword - 1]}"
if [[ $cword > 1 ]]; then
w2="${COMP_WORDS[$cword - 2]}"
fi
if [[ "$cur" == -* ]]; then
# -foo<tab>
arg="$cur"
@ -30,18 +48,18 @@ _clang()
# If clang is old that it does not support --autocomplete,
# fall back to the filename completion.
if [[ "$?" != 0 ]]; then
_filedir
_clang_filedir
return
fi
if [[ "$cur" == '=' ]]; then
COMPREPLY=( $( compgen -W "$flags" -- "") )
elif [[ "$flags" == "" || "$arg" == "" ]]; then
_filedir
_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.
[[ "${flags: -1}" == '=' ]] && compopt -o nospace
[[ "${flags: -1}" == '=' ]] && compopt -o nospace 2> /dev/null
COMPREPLY=( $( compgen -W "$flags" -- "$cur" ) )
fi
}