add a script to find & fix missing semicolons in ObjC method implementations

find-missing-semis.rb

@@ -0,0 +1,68 @@
+#!/usr/bin/env ruby -w
+
+require 'optparse'
+
+USAGE_TEXT = "Usage: find-missing-semis.rb [options] <directory>"
+
+Line = Struct.new(:num, :text)
+
+def main
+  options = parse_options
+  dir = ARGV.first
+  if File.directory?(dir)
+    Dir[File.join(dir, '**/*.m')].each do |path|
+      find_missing_semis(path, options[:fix])
+    end
+  else
+    puts USAGE_TEXT
+    exit 1
+  end
+end
+
+def parse_options
+  options = {
+    fix: false,
+  }
+  OptionParser.new do |opts|
+    opts.banner = USAGE_TEXT
+
+    opts.on("-f", "--[no-]fix", "Insert missing semicolons automatically") do |f|
+      options[:fix] = f
+    end
+  end.parse!
+  options
+end
+
+def find_missing_semis(path, should_fix = false)
+  num = 0
+  pairs = []
+  current_pair = nil
+  File.readlines(path).each do |text|
+    num += 1
+    line = Line.new(num, text)
+    if current_pair
+      current_pair << line
+      pairs << current_pair
+    end
+    current_pair = [line]
+  end
+
+  missing_semicolon_pairs = pairs.select do |l1, l2|
+    l1.text =~ /^[-+]/ && l1.text !~ /;$/ && l2.text =~ /^\{/
+  end
+  missing_semicolon_pairs.each do |l1, l2|
+    puts "Missing semicolon at #{path}:#{l1.num}: #{l1.text}"
+    if should_fix
+      l1.text = l1.text.chomp + ";\n"
+    end
+  end
+  if should_fix && missing_semicolon_pairs.length > 0
+    lines = pairs.map(&:first) + [pairs.last.last]
+    text = lines.map(&:text).join
+    File.open(path, 'w') do |f|
+      f.print(text)
+    end
+  end
+end
+
+main if $0 == __FILE__