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

Linus Torvalds wrote:

On Tue, 18 Oct 2005, John Ellson wrote:

quoted

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 [off-list ref] Tue, 18 Oct 2005 23:13:44 -0400
committer John Ellson [off-list ref] 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