[PATCH] cg-history FILE [NTH_PARENT] - was: Re: Wanted - a file browser interface to git

[John Ellson <ellson@research.att.com>]

Linus Torvalds wrote:
> 
> On Tue, 18 Oct 2005, John Ellson wrote:
>> An example is:  "I know that file xxx contained algorithm yyy at some point in
>> the past and now I'd like to browse back through the history of xxx to find
>> the exact details."
> 
> You are aware of "git whatchanged -p xxx", right?
> 
> Yeah, it's not graphical, and I agree that it might be very cool to have a 
> graphical version of it. But I thought I'd mention it even so. A 
> surprising number of people seem to have never realized, and at least for 
> me personally, it's one of the most common things I do.
> 
> 		Linus


OK.  Here is a not-very-smart cogito command to display the history of a file, 
or the state of the nth parent of the file in its history.

Feedback and or complete rewrites are requested ;-)

John


produce the history of a file, or its state at its nth_parent

---
commit 8478ad1164e37e9cca039a3f9552d2a98f7bead6
tree 40b39d5f9af573a7815f073cada03c7903bfc6fa
parent 5d74e4859afc81a4658133d5a83809ac814dbf34
author John Ellson <ellson@ontap.ellson.com> Tue, 18 Oct 2005 23:13:44 -0400
committer John Ellson <ellson@ontap.ellson.com> Tue, 18 Oct 2005 23:13:44 -0400

  cg-history |   36 ++++++++++++++++++++++++++++++++++++
  1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/cg-history b/cg-history
new file mode 100755
index 0000000..ba86f71
--- /dev/null
+++ b/cg-history
@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+#
+# Display the change history of a file.
+# Copyright (c) John Ellson, 2005
+#
+# The change history of a file is displayed on stdout, or
+# if an integer is provided for NTH_PARENT, then the complete
+# state of the file at that step in its history is sent to stdout.
+#
+
+USAGE="cg-history FILE [NTH_PARENT]"
+
+. ${COGITO_LIB}cg-Xlib || exit 1
+
+[ "$ARGS" ] || usage
+
+if [ "${ARGS[1]}" = "" ]; then
+       git-whatchanged -p "${ARGS[0]}"
+else
+       i=0
+       git-whatchanged -p "${ARGS[0]}" |
+       while read -r cmd sha rest
+       do
+               case "$cmd" in
+               diff-tree)
+                       i=`expr $i + 1`
+                       if [ $i = ${ARGS[1]} ] ; then
+                               cg-admin-cat -r "$sha" "${ARGS[0]}"
+                               exit 0
+                       fi
+                       ;;
+               *)
+                       ;;
+               esac
+       done
+fi