[PATCH] Pretty-print date in 'git log'

[PATCH] Pretty-print date in 'git log'

[David Woodhouse]

Add tool to render git's "<utcseconds> <zone>" into an RFC2822-compliant
string, because I don't think date(1) can do it. Use same for 'git log'
output.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

--- Makefile
+++ Makefile	2005-04-18 15:40:43.000000000 +1000
@@ -14,7 +14,7 @@
 
 PROG=   update-cache show-diff init-db write-tree read-tree commit-tree \
 	cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \
-	check-files ls-tree merge-base
+	check-files ls-tree merge-base show-date
 
 SCRIPT=	parent-id tree-id git gitXnormid.sh gitadd.sh gitaddremote.sh \
 	gitcommit.sh gitdiff-do gitdiff.sh gitlog.sh gitls.sh gitlsobj.sh \
--- gitlog.sh
+++ gitlog.sh	2005-04-18 15:39:38.000000000 +1000
@@ -13,6 +13,23 @@
 
 rev-tree $base | sort -rn | while read time commit parents; do
 	echo commit ${commit%:*};
-	cat-file commit $commit
+	cat-file commit $commit | while read type rest ; do
+		case "$type" in
+		    "author"|"committer")
+		        DATESTAMP="`echo $rest | cut -f2 -d\>`"
+			RFC2822DATE="`show-date $DATESTAMP 2>/dev/null || echo $DATESTAMP`"
+			echo $type $rest | sed "s/$DATESTAMP\$/ $RFC2822DATE/"
+			;;
+
+		    "")
+			echo ""
+			cat
+			;;
+		    *)
+			echo $type $rest
+			;;
+		esac
+	    done
+		    
 	echo -e "\n--------------------------"
 done
--- show-date.c.orig	2005-04-18 15:43:06.000000000 +1000
+++ show-date.c	2005-04-18 15:42:15.000000000 +1000
@@ -0,0 +1,48 @@
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "cache.h"
+
+static const char *month_names[] = {
+        "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+        "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static const char *weekday_names[] = {
+        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+};
+
+int main(int argc, char **argv)
+{
+	time_t t;
+	int offset;
+	char *p;
+	struct tm tm;
+
+	if (argc != 3)
+		usage("usage: show-date <seconds> <zone>");
+
+	t = strtol(argv[1], &p, 0);
+	if (*p || !t)
+		usage("usage: show-date <seconds> <zone>");
+
+	if (argv[2][0] != '-' && argv[2][0] != '+')
+		usage("usage: show-date <seconds> <zone>");
+
+	offset = strtol(argv[2]+1, &p, 10);
+	if (*p || p!= argv[2]+5)
+		usage("usage: show-date <seconds> <zone>");
+
+	if (argv[2][0] == '-')
+		offset = -offset;
+
+	offset = 60 * (offset % 100 + (offset / 100 * 60));
+
+	t += offset;
+	gmtime_r(&t, &tm);
+
+	printf("%s, %d %s %04d %02d:%02d:%02d %s\n",
+	       weekday_names[tm.tm_wday], tm.tm_mday, month_names[tm.tm_mon],
+	       tm.tm_year+1900, tm.tm_hour, tm.tm_min, tm.tm_sec, argv[2]);
+	return 0;
+}

-- 
dwmw2

Re: [PATCH] Pretty-print date in 'git log'

[Petr Baudis]

Dear diary, on Mon, Apr 18, 2005 at 09:08:24AM CEST, I got a letter
where David Woodhouse <dwmw2@infradead.org> told me that...
> On Mon, 2005-04-18 at 07:43 +0100, Sanjoy Mahajan wrote:
> > Is this short script good enough:
> 
> It's not far off; thanks. We might as well just do it like that inside
> gitlog.sh. Could do with falling back to just printing the input if it
> can't parse it -- the git repo has old-style dates in it still.

Yes. As far as I'm concerned, I'd put such stuff to git log, and extend
it usage so that it is possible to print individual log entries with it
- just make it accept a _range_ of commits, and then do

	git log $commit $commit

And maybe options for changelog-suitable output (RMK-like) etc.

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
C++: an octopus made by nailing extra legs onto a dog. -- Steve Taylor

Re: [PATCH] Pretty-print date in 'git log'

[David Woodhouse]

On Mon, 2005-04-18 at 12:27 +0200, Petr Baudis wrote:
> Yes. As far as I'm concerned, I'd put such stuff to git log, and extend
> it usage so that it is possible to print individual log entries with it
> - just make it accept a _range_ of commits, and then do
> 
>         git log $commit $commit

That's fairly trivial. In the current (and misguided) version with
chronological output, rev-tree will do it all for you, in fact:

	rev-tree $1 ^$2

In the older and more useful version, it was only slightly more complex:

 base=$(gitXnormid.sh -c $1) || exit 1
 
+if [ -n "$2" ]; then
+    endpoint=$(gitXnormid.sh -c $2) || exit 1
+    if rev-tree $base $endpoint | grep -q $base:3; then
+        base=
+    else
+        rev-tree --edges $base $endpoint | sed 's/[a-z0-9]*:1//g' > $TMPCL
+    fi
+fi
 changelog $base
 rm $TMPCL $TMPCM


-- 
dwmw2

Re: [PATCH] Pretty-print date in 'git log'

[Ray Lee]

On Mon, 2005-04-18 at 15:46 +1000, David Woodhouse wrote:
> Add tool to render git's "<utcseconds> <zone>" into an RFC2822-compliant
> string, because I don't think date(1) can do it.

I admit it's not obvious, but date(1) includes gnu's full date parser,
so you can pull stunts like:

ray:~/work/home$ date -ud 'jan 1, 1970 + 1111111111 seconds'
Fri Mar 18 01:58:31 UTC 2005
ray:~/work/home$ date -ud 'jan 1, 1970 + 1111111111 seconds + 0800'
Fri Mar 18 09:58:31 UTC 2005

Ray

Re: [PATCH] Pretty-print date in 'git log'

[Sanjoy Mahajan]

> ray:~/work/home$ date -ud 'jan 1, 1970 + 1111111111 seconds'
> Fri Mar 18 01:58:31 UTC 2005
> ray:~/work/home$ date -ud 'jan 1, 1970 + 1111111111 seconds + 0800'
> Fri Mar 18 09:58:31 UTC 2005

I sent David a short script to do almost that, except that mine needed
to negate the timezone whereas yours elegantly changes +0800 to + 0800

In your 2nd example, you'll need 'sed' to replace UTC (or +0000 if
using -R) in the output by +0800, because the 1111111111 is the UTC
seconds, so the actual time is Fri Mar 18 01:58:31 UTC 2005 (as given
by your first example).

-Sanjoy