1 files changed, 50 insertions, 0 deletions
diff --git a/python/mach/mach/commands/settings.py b/python/mach/mach/commands/settings.py
new file mode 100644
index 0000000000..474790cd42
--- /dev/null
+++ b/python/mach/mach/commands/settings.py
@@ -0,0 +1,50 @@
+# 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/.
+
+from textwrap import TextWrapper
+
+from mach.config import TYPE_CLASSES
+from mach.decorators import Command, CommandArgument
+
+# Interact with settings for mach.
+
+# Currently, we only provide functionality to view what settings are
+# available. In the future, this module will be used to modify settings, help
+# people create configs via a wizard, etc.
+
+
+@Command("settings", category="devenv", description="Show available config settings.")
+@CommandArgument(
+    "-l",
+    "--list",
+    dest="short",
+    action="store_true",
+    help="Show settings in a concise list",
+)
+def run_settings(command_context, short=None):
+    """List available settings."""
+    types = {v: k for k, v in TYPE_CLASSES.items()}
+    wrapper = TextWrapper(initial_indent="# ", subsequent_indent="# ")
+    for i, section in enumerate(sorted(command_context._mach_context.settings)):
+        if not short:
+            print("%s[%s]" % ("" if i == 0 else "\n", section))
+
+        for option in sorted(command_context._mach_context.settings[section]._settings):
+            meta = command_context._mach_context.settings[section].get_meta(option)
+            desc = meta["description"]
+
+            if short:
+                print("%s.%s -- %s" % (section, option, desc.splitlines()[0]))
+                continue
+
+            if option == "*":
+                option = "<option>"
+
+            if "choices" in meta:
+                value = "{%s}" % ", ".join(meta["choices"])
+            else:
+                value = "<%s>" % types[meta["type_cls"]]
+
+            print(wrapper.fill(desc))
+            print(";%s=%s" % (option, value))