[GSoC] Flag value completion for clang

This is patch for GSoC project, bash-completion for clang.

To use this on bash, please run `source clang/utils/bash-autocomplete.sh`.
bash-autocomplete.sh is code for bash-completion.

In this patch, Options.td was mainly changed in order to add value class
in Options.inc.

llvm-svn: 305805

1 files changed, 27 insertions, 3 deletions

diff --git a/clang/utils/bash-autocomplete.sh b/clang/utils/bash-autocomplete.sh
index de4a435b884..3e9f65f10db 100644
--- a/clang/utils/bash-autocomplete.sh
+++ b/clang/utils/bash-autocomplete.sh
@@ -1,11 +1,35 @@
 # Please add "source /path/to/bash-autocomplete.sh" to your .bashrc to use this.
 _clang()
 {
-  local cur prev words cword flags
+  local cur prev words cword arg
   _init_completion -n : || return
 
-  flags=$( clang --autocomplete="$cur" )
-  if [[ "$flags" == "" || "$cur" == "" ]]; then
+  # 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]}"
+  if [[ "$cur" == -* ]]; then
+    # -foo<tab>
+    arg="$cur"
+  elif [[ "$w1" == -*  && "$cur" == '=' ]]; then
+    # -foo=<tab>
+    arg="$w1=,"
+  elif [[ "$w1" == -* ]]; then
+    # -foo <tab> or -foo bar<tab>
+    arg="$w1,$cur"
+  elif [[ "$w2" == -* && "$w1" == '=' ]]; then
+    # -foo=bar<tab>
+    arg="$w2=,$cur"
+  else
+    _filedir
+  fi
+
+  local flags=$( clang --autocomplete="$arg" )
+  if [[ "$cur" == "=" ]]; then
+    COMPREPLY=( $( compgen -W "$flags" -- "") )
+  elif [[ "$flags" == "" ]]; then
     _filedir
   else
     COMPREPLY=( $( compgen -W "$flags" -- "$cur" ) )