gn: start of format command

tools/gn/format_test_data/003.golden

+executable("test") {
+  sources = [
+    "stuff.cc",
+    "things.cc",
+  ]
+
+  deps = [ "//base" ]

[brettw, 2014/09/25 22:11:32]

I usually like source and deps on separate lines even if there is only one since
it makes it easier to add stuff. But this is fine for now, and I won't be too
sad if we decide to change the rule to make the autoformatting easier.

[scottmg, 2014/09/25 23:03:11]

You mean specifically just for source and deps, not all lists? Right now it
doesn't know what the lhs of the list is, but we could certainly have a pass
that walks the tree and forces things the way we like them.

[brettw, 2014/09/25 23:06:58]

Yeah, in the style guide I listed these as separate cases to always use the
multiline format when assigning (but not +=. But with an autoformatter, I'm not
necessarily wedded to this, and it could be a bad idea.

+}