Re: feature request: git-log should accept sth like v2.6.26-rc8-227

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

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Hi,

On Fri, 11 Jul 2008, Johannes Schindelin wrote:

> On Fri, 11 Jul 2008, Dmitry Potapov wrote:
> 
> > On Fri, Jul 11, 2008 at 04:58:40PM +0200, Toralf Förster wrote:
> > > 
> > > $> git-log v2.6.26-rc9.. --pretty=short | grep "^commit" | cut -f2 -d' ' | xargs -n 1 git describe | grep '\-56\-'
> > 
> > The fastest way to do the same would be:
> > 
> > git rev-list v2.6.26-rc9.. | xargs git describe | grep '\-56\-'
> 
> You forgot the "--all" option to rev-list.
> 
> And I doubt it would be the "fastest" way, in terms of execution speed.
> 
> Also, it leaves out this case:
> 
> rc9 - A - B - C - D - F
>     \               /
>       ----- E -----
> 
> F would be "rc9-5", but also "rc9-2".
> 
> Oh, and this would leave out reflogs, too.
> 
> Can we please let this concept die now?

Heh, just as an intellectual exercise, I could not resist trying to brush 
up my l33t py7h0n sk1llz (and I am sure somebody will teach me something 
useful again):

-- snipsnap --
#!/usr/bin/python

import os
import sys

if len(sys.argv) != 2:
	print 'Usage:', sys.argv[0], '<pseudo-describe>'

# split argument
dash = sys.argv[1].rindex('-')
tag = sys.argv[1][0:dash]
generation = int(sys.argv[1][dash + 1:])

# get sha1 of given tag's commit
pipe = os.popen('git rev-parse ' + tag + '^{commit}')
sha1 = pipe.readlines()[0].strip()
pipe.close()

# 'number' will contain (positive) distance to given commit
number = dict()
number[sha1] = set()
number[sha1].add(0)

pipe = os.popen('git rev-list ^' + sha1 + ' --all --parents')
rev_list = pipe.readlines()
pipe.close()

rev_list.reverse()
for line in rev_list:
	list = line.strip().split(' ')
	number[list[0]] = set()
	for parent in list[1:]:
		if parent in number:
			for n in number[parent]:
				number[list[0]].add(n + 1)
	for n in number[list[0]]:
		if n == generation:
			print list[0]