tools: Add a script to generate arch-specific ctags

tools/dev/gen-tags.py

Index: tools/dev/gen-tags.py
diff --git a/tools/dev/gen-tags.py b/tools/dev/gen-tags.py
new file mode 100755
index 0000000000000000000000000000000000000000..5097287d6c02c2a6dade9375e879cd03446d10d1
--- /dev/null
+++ b/tools/dev/gen-tags.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+# Copyright 2017 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""\
+Convenience script for generating arch-specific ctags file.
+This script MUST be executed at the top directory.
+
+Usage:
+    $ tools/dev/gen-tags.py [<arch>...]
+
+The example usage is as follows:
+    $ tools/dev/gen-tags.py x64
+
+If no <arch> is given, it generates tags file for all arches:
+    $ tools/dev/gen-tags.py
+"""
+import os

[Jakob Kummerow, 2017/03/21 16:14:43]

nit: unused import

+import subprocess
+import sys
+
+# All arches that this script understands.
+ARCHES = ["ia32", "x64", "arm", "arm64", "mips", "mips64", "ppc", "s390", "x87"]
+
+def PrintHelpAndExit():
+  print(__doc__)
+  sys.exit(0)
+
+def _Call(cmd, silent=False):
+  if not silent: print("# %s" % cmd)
+  return subprocess.call(cmd, shell=True)
+
+class ArgumentParser(object):
+  def __init__(self):
+    self.global_targets = set()
+    self.configs = {}
+
+  def ParseArg(self, argstring):
+    if argstring in ("-h", "--help", "help"):
+      PrintHelpAndExit()
+    return argstring
+
+  def ParseArguments(self, argv):
+#    if not CheckIfTopDir(argv[0]):

[Jakob Kummerow, 2017/03/21 16:14:43]

nit: drop this

+    if not "tools/dev" in argv[0]:
+      PrintHelpAndExit()
+    argv = argv[1:]
+
+    # if no argument is given, then generate ctags for all arches

[Jakob Kummerow, 2017/03/21 16:14:43]

nit: Proper capitalization and punctuation please.

+    if len(argv) == 0:
+      return ARCHES
+
+    user_arches = []
+    for argstring in argv:
+      user_arches.append(self.ParseArg(argstring))
+
+    return user_arches
+
+def Main(argv):
+  user_arches = []
+
+  parser = ArgumentParser()
+  user_arches = parser.ParseArguments(argv)
+
+  exclude_arches = list(ARCHES)
+  for user_arch in user_arches:
+    exclude_arches.remove(user_arch)
+
+  f = lambda arch : "--exclude=" + arch
+  exclude_options = ' '.join(map(f, exclude_arches))

[Jakob Kummerow, 2017/03/21 16:14:43]

simpler:

exclude_options = ["--exclude=%s" % arch for arch in exclude_arches]

+
+  command = "ctags --fields=+l " + exclude_options + " -R include/* src/*"

[Jakob Kummerow, 2017/03/21 16:14:43]

what about test/* ?

+  _Call(command)
+
+if __name__ == "__main__":
+  sys.exit(Main(sys.argv))