Update CHANGELOG and add a script to help with slice type migration

CHANGELOG.md

@@ -7,6 +7,15 @@
 ### Added
 - Support for placeholders in flag usage strings
 
+## [2.0.0]
+### Added
+- `NewStringSlice` and `NewIntSlice` for creating their related types
+
+### Removed
+- the ability to specify `&StringSlice{...string}` or `&IntSlice{...int}`.
+To migrate to the new API, you may choose to run [this helper
+(python) script](./cli-migrate-slice-types).
+
 ## [1.14.0] - 2016-04-03 (backfilled 2016-04-25)
 ### Added
 - Codebeat badge
@@ -220,6 +229,7 @@
 - Initial implementation.
 
 [Unreleased]: https://github.com/codegangsta/cli/compare/v1.14.0...HEAD
+[2.0.0]: https://github.com/codegangsta/cli/compare/v1.14.0...v2.0.0
 [1.14.0]: https://github.com/codegangsta/cli/compare/v1.13.0...v1.14.0
 [1.13.0]: https://github.com/codegangsta/cli/compare/v1.12.0...v1.13.0
 [1.12.0]: https://github.com/codegangsta/cli/compare/v1.11.1...v1.12.0

cli-migrate-slice-types

@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+from __future__ import print_function, unicode_literals
+
+import argparse
+import os
+import re
+import sys
+
+
+DESCRIPTION = """\
+Migrate arbitrary `.go` sources from the pre-v2.0.0 API for StringSlice and
+IntSlice types, optionally writing the changes back to file.
+"""
+SLICE_TYPE_RE = re.compile(
+    '&cli\\.(?P<type>IntSlice|StringSlice){(?P<args>[^}]*)}',
+    flags=re.DOTALL
+)
+
+
+def main(sysargs=sys.argv[:]):
+    parser = argparse.ArgumentParser(
+        description=DESCRIPTION,
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument('basedir', nargs='?', metavar='BASEDIR',
+        type=os.path.abspath, default=os.getcwd())
+    parser.add_argument('-w', '--write', help='write changes back to file',
+        action='store_true', default=False)
+
+    args = parser.parse_args(sysargs[1:])
+
+    for filepath in _find_candidate_files(args.basedir):
+        updated_source = _update_source(filepath)
+        if args.write:
+            print('Updating {!r}'.format(filepath))
+
+            with open(filepath, 'w') as outfile:
+                outfile.write(updated_source)
+        else:
+            print('// -> Updated {!r}'.format(filepath))
+            print(updated_source)
+
+    return 0
+
+
+def _update_source(filepath):
+    with open(filepath) as infile:
+        source = infile.read()
+        return SLICE_TYPE_RE.sub(_slice_type_repl, source)
+
+
+def _slice_type_repl(match):
+    return 'cli.New{}({})'.format(
+        match.groupdict()['type'], match.groupdict()['args']
+    )
+
+
+def _find_candidate_files(basedir):
+    for curdir, dirs, files in os.walk(basedir):
+        for i, dirname in enumerate(dirs[:]):
+            if dirname.startswith('.'):
+                dirs.pop(i)
+
+        for filename in files:
+            if not filename.endswith('.go'):
+                continue
+
+            filepath = os.path.join(curdir, filename)
+            if not os.access(filepath, os.R_OK | os.W_OK):
+                continue
+
+            yield filepath
+
+
+if __name__ == '__main__':
+    sys.exit(main())