[PATCH v8 6/6] contrib: related: implement custom option parser

[Felipe Contreras <felipe.contreras@xxxxxxxxx>]

Ruby's option parser is not extensible enough to keep unknown options.

Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
---
 contrib/related/git-related | 83 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 71 insertions(+), 12 deletions(-)

diff --git a/contrib/related/git-related b/contrib/related/git-related
index 585572b..c933898 100755
--- a/contrib/related/git-related
+++ b/contrib/related/git-related
@@ -3,26 +3,85 @@
 # This script finds people that might be interested in a patch
 # usage: git related <file>
 
-require 'optparse'
-
 $since = '5-years-ago'
 $min_percent = 10
 $files = []
 $rev_args = []
 
-OptionParser.new do |opts|
-  opts.program_name = 'git related'
-  opts.banner = 'usage: git related [options] <files | rev-list options>'
+class SimpleParser
+  attr_writer :usage
+
+  class Option
+    attr_reader :short, :long, :help
+
+    def initialize(short, long, help, &block)
+      @block = block
+      @short = short
+      @long = long
+      @help = help
+    end
+
+    def call(v)
+      @block.call(v)
+    end
+  end
 
-  opts.on('-p', '--min-percent N', Integer,
-          'Minium percentage of role participation') do |v|
-    $min_percent = v
+  def initialize
+    @list = {}
+  end
+
+  def on(short=nil, long=nil, help=nil, &block)
+    opt = Option.new(short, long, help, &block)
+    @list[short] = opt if short
+    @list[long] = opt if long
+  end
+
+  def parse
+    i = 0
+    if ARGV.member?('-h') or ARGV.member?('--help')
+      usage
+      exit 1
+    end
+    while cur = ARGV[i] do
+      if cur =~ /^(-.+?)(?:=(.*))?$/
+        opt = @list[$1]
+        if opt
+          v = $2 || ARGV.delete_at(i + 1)
+          opt.call(v)
+          ARGV.delete_at(i)
+          next
+        end
+      end
+      i += 1
+    end
   end
-  opts.on('-d', '--since DATE',
-          'How far back to search for relevant commits') do |v|
-    $since = v
+
+  def usage
+    puts 'usage: %s' % @usage
+    @list.values.uniq.each do |opt|
+      s = '    '
+      s << [opt.short, opt.long].compact.join(', ')
+      s << '%*s%s' % [26 - s.size, '', opt.help] if opt.help
+      puts s
+    end
   end
-end.parse!
+
+end
+
+opts = SimpleParser.new
+opts.usage = 'usage: git related [options] <files | rev-list options>'
+
+opts.on('-p', '--min-percent',
+        'Minium percentage of role participation') do |v|
+  $min_percent = v.to_i
+end
+
+opts.on('-d', '--since',
+        'How far back to search for relevant commits') do |v|
+  $since = v
+end
+
+opts.parse
 
 class Commit
 
-- 
1.8.3.358.g5a91d05

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