[PATCH v6] Add new git-related helper to contrib

From: Felipe Contreras <felipe.contreras@gmail.com>
Date: May 19, 2013, 15:53 UTC
Message-ID: <1368978823-18247-1-git-send-email-felipe.contreras@gmail.com>

This script find people that might be interested in a patch, by going back through the history for each single hunk modified, and finding people that reviewed, acknowledge, signed, or authored the code the patch is modifying.

It does this by running 'git blame' incrementally on each hunk, and then parsing the commit message. After gathering all the relevant people, it groups them to show what exactly was their role when the participated in the development of the relevant commit, and on how many relevant commits they participated. They are only displayed if they pass a minimum threshold of participation.

For example:

  % git related 0001-remote-hg-trivial-cleanups.patch
  Felipe Contreras <felipe.contreras@gmail.com>
  Jeff King <peff@peff.net>
  Max Horn <max@quendi.de>
  Junio C Hamano <gitster@pobox.com>

Thus it can be used for 'git send-email' as a cc-cmd.

There might be some other related functions to this script, not just to be used as a cc-cmd.

Comments-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---

Sames as v5, with a few tiny modifications. I'm tired of sending the whole series multiple times over the years, only to get stuck at the first patch, so I'll send only the first one.

 contrib/related/git-related | 124 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100755 contrib/related/git-related

diff --git a/contrib/related/git-related b/contrib/related/git-related
new file mode 100755
index 0000000..b96dcdd
--- /dev/null
+++ b/contrib/related/git-related
@@ -0,0 +1,124 @@
+#!/usr/bin/env ruby
+
+# This script finds people that might be interested in a patch
+# usage: git related <file>
+
+$since = '5-years-ago'
+$min_percent = 10
+
+def fmt_person(name, email)
+  '%s <%s>' % [name, email]
+end
+
+class Commit
+
+  attr_reader :persons
+
+  def initialize(id)
+    @id = id
+    @persons = []
+  end
+
+  def parse(data)
+    msg = nil
+    data.each_line do |line|
+      if not msg
+        case line
+        when /^author ([^<>]+) <(\S+)> (.+)$/
+          @persons << fmt_person($1, $2)
+        when /^$/
+          msg = true
+        end
+      else
+        if line =~ /^(Signed-off|Reviewed|Acked)-by: ([^<>]+) <(\S+?)>$/
+          @persons << fmt_person($2, $3)
+        end
+      end
+    end
+    @persons.uniq!
+  end
+
+end
+
+class Commits
+
+  def initialize
+    @items = {}
+  end
+
+  def size
+    @items.size
+  end
+
+  def each(&block)
+    @items.each(&block)
+  end
+
+  def import
+    return if @items.empty?
+    File.popen(%w[git cat-file --batch], 'r+') do |p|
+      p.write(@items.keys.join("\n"))
+      p.close_write
+      p.each do |line|
+        if line =~ /^(\h{40}) commit (\d+)/
+          id, len = $1, $2
+          data = p.read($2.to_i)
+          @items[id].parse(data)
+        end
+      end
+    end
+  end
+
+  def get_blame(source, start, len, from)
+    return if len == 0
+    len ||= 1
+    File.popen(['git', 'blame', '--incremental', '-CCC',
+               '-L', '%u,+%u' % [start, len],
+               '--since', $since, from + '^',
+               '--', source]) do |p|
+      p.each do |line|
+        if line =~ /^(\h{40})/
+          id = $&
+          @items[id] = Commit.new(id)
+        end
+      end
+    end
+  end
+
+  def from_patch(file)
+    from = source = nil
+    File.open(file) do |f|
+      f.each do |line|
+        case line
+        when /^From (\h+) (.+)$/
+          from = $1
+        when /^---\s+(\S+)/
+          source = $1 != '/dev/null' ? $1[2..-1] : nil
+        when /^@@ -(\d+)(?:,(\d+))?/
+          get_blame(source, $1, $2, from)
+        end
+      end
+    end
+  end
+
+end
+
+exit 1 if ARGV.size != 1
+
+commits = Commits.new
+commits.from_patch(ARGV[0])
+commits.import
+
+count_per_person = Hash.new(0)
+
+commits.each do |id, commit|
+  commit.persons.each do |person|
+    count_per_person[person] += 1
+  end
+end
+
+count_per_person.each do |person, count|
+  percent = count.to_f * 100 / commits.size
+  next if percent < $min_percent
+  puts person
+end

-- 
1.8.3.rc3.286.g3d43083