[GSoC] Shell autocompletion for clang

Summary:
This is a first 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.

Simple flag completion and path completion is available in this patch.

Reviewers: teemperor, v.g.vassilev, ruiu, Bigcheese, efriedma

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D33237

llvm-svn: 303670
diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
index 9e43a10..c163a2b 100644
--- a/clang/CMakeLists.txt
+++ b/clang/CMakeLists.txt
@@ -359,6 +359,10 @@
     PATTERN "*.inc"
     PATTERN "*.h"
     )
+
+  install(PROGRAMS utils/bash-autocomplete.sh
+    DESTINATION share/clang
+    )
 endif()
 
 add_definitions( -D_GNU_SOURCE )
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index d812bd8..4f1ea08 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -469,6 +469,7 @@
 def arch : Separate<["-"], "arch">, Flags<[DriverOption]>;
 def arch__only : Separate<["-"], "arch_only">;
 def a : Joined<["-"], "a">;
+def autocomplete : Joined<["--"], "autocomplete=">;
 def bind__at__load : Flag<["-"], "bind_at_load">;
 def bundle__loader : Separate<["-"], "bundle_loader">;
 def bundle : Flag<["-"], "bundle">;
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index f36deff..bec4bf4 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1216,6 +1216,13 @@
     return false;
   }
 
+  if (Arg *A = C.getArgs().getLastArg(options::OPT_autocomplete)) {
+    // Print out all options that start with a given argument. This is used for
+    // shell autocompletion.
+    llvm::outs() << llvm::join(Opts->findByPrefix(A->getValue()), " ") << '\n';
+    return false;
+  }
+
   if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
     ToolChain::RuntimeLibType RLT = TC.GetRuntimeLibType(C.getArgs());
     switch (RLT) {
diff --git a/clang/test/Driver/autocomplete.c b/clang/test/Driver/autocomplete.c
new file mode 100644
index 0000000..94649f2
--- /dev/null
+++ b/clang/test/Driver/autocomplete.c
@@ -0,0 +1,6 @@
+// RUN: %clang --autocomplete=-fsyn | FileCheck %s -check-prefix=FSYN
+// FSYN: -fsyntax-only
+// RUN: %clang --autocomplete=-s | FileCheck %s -check-prefix=STD
+// STD: -std={{.*}}-stdlib=
+// RUN: %clang --autocomplete=foo | not FileCheck %s -check-prefix=NONE
+// NONE: foo
diff --git a/clang/utils/bash-autocomplete.sh b/clang/utils/bash-autocomplete.sh
new file mode 100644
index 0000000..a906712
--- /dev/null
+++ b/clang/utils/bash-autocomplete.sh
@@ -0,0 +1,14 @@
+# Please add "source /path/to/bash-autocomplete.sh" to your .bashrc to use this.
+_clang()
+{
+  local cur prev words cword flags
+  _init_completion -n : || return
+
+  flags=$( clang --autocomplete="$cur" )
+  if [[ "$flags" == "" || "$cur" == "" ]]; then
+    _filedir
+  else
+    COMPREPLY=( $( compgen -W "$flags" -- "$cur" ) )
+  fi
+} 
+complete -F _clang clang