1 files changed, 55 insertions, 0 deletions
diff --git a/python/mozbuild/mozbuild/compilation/codecomplete.py b/python/mozbuild/mozbuild/compilation/codecomplete.py
new file mode 100644
index 0000000000..b5a466b729
--- /dev/null
+++ b/python/mozbuild/mozbuild/compilation/codecomplete.py
@@ -0,0 +1,55 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This modules provides functionality for dealing with code completion.
+
+from mach.decorators import Command, CommandArgument
+
+from mozbuild.shellutil import quote as shell_quote
+from mozbuild.shellutil import split as shell_split
+
+
+# Instropection commands.
+
+
+@Command(
+    "compileflags",
+    category="devenv",
+    description="Display the compilation flags for a given source file",
+)
+@CommandArgument(
+    "what", default=None, help="Source file to display compilation flags for"
+)
+def compileflags(command_context, what):
+    from mozbuild.compilation import util
+    from mozbuild.util import resolve_target_to_make
+
+    if not util.check_top_objdir(command_context.topobjdir):
+        return 1
+
+    path_arg = command_context._wrap_path_argument(what)
+
+    make_dir, make_target = resolve_target_to_make(
+        command_context.topobjdir, path_arg.relpath()
+    )
+
+    if make_dir is None and make_target is None:
+        return 1
+
+    build_vars = util.get_build_vars(make_dir, command_context)
+
+    if what.endswith(".c"):
+        cc = "CC"
+        name = "COMPILE_CFLAGS"
+    else:
+        cc = "CXX"
+        name = "COMPILE_CXXFLAGS"
+
+    if name not in build_vars:
+        return
+
+    # Drop the first flag since that is the pathname of the compiler.
+    flags = (shell_split(build_vars[cc]) + shell_split(build_vars[name]))[1:]
+
+    print(" ".join(shell_quote(arg) for arg in util.sanitize_cflags(flags)))