Trey Harris treyharris

Why the `ident` attribute doesn't work in Git like in CVS or SVN

This is a wrinkle that people often don't get about the ident attribute: in CVS or Subversion, it would be legitimate to have a VERSION file containing nothing but $Id$ as a way of tracking that the right push had happened; if you did that with git, you'd get nothing useful. If you run the script below (or just read it and the output that follows), you can see why.

(Please direct comments on this to https://plus.google.com/+TreyHarris/posts/KRgNG3zDk9x.)

How do you do it?

Setting it up in Git is relatively simple. You create (or edit) the file .gitattributes and add a line telling Git to replace $Id$ when found in files that match certain filenames:

	# Clear scrollback buffer portably
	if [[ $TERM_PROGRAM =~ 'Apple_Terminal' ]]; then
	clear
	printf '\e[3J'
	elif [[ $TERM_PROGRAM =~ 'iTerm2' ]]; then
	printf '\e]50;ClearScrollback\a'
	fi

	#!/bin/zsh
	## Show shell commands in progress
	## Usage:
	## source $thisFile
	##
	# show "Explanation" "
	# cmd 1
	# cmd 2"

	banner() {

	#!/bin/zsh

	# Make any non-zero return fatal just in case
	setopt err_exit

	source =(curl https://gist.githubusercontent.com/treyharris/c486c9f8776802e270b7/raw/2d0519826f3b8ca8446f59211ecd0dc738221d3d/showshell.zsh 2> /dev/null)

	local dir=/tmp/ident-test
	local files=5

	# Just skip the theme.
	echo From the trey theme >&2
	touch /tmp/trey-theme-run
	export MY_NO_ZSH_THEME=1

	# Need a token for homebrew calls to GitHub.
	function {
	local _homebrew_github_pat_file=~/.homebrew-github-token
	if [[ -f "${_homebrew_github_pat_file}" ]]; then
	export HOMEBREW_GITHUB_API_TOKEN=$(cat "${_homebrew_github_pat_file}")
	elif _is_interactive_shell; then
	export HOMEBREW_GITHUB_PAT_FILE="${_homebrew_github_pat_file}"
	echoerr \
	"No GitHub Personal Access Token for Homebrew. You may be rate-limited.
	Run 'homebrew_github_token' for details."

	@font-face {
	font-family: octicons-anchor;
	src: url(data:font/woff;charset=utf-8;base64,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

	/*
	* Trey's Markdown Here primary styling css, updated 2015-09-06
	* NOTE:
	* - The use of browser-specific styles (-moz-, -webkit-) should be avoided.
	* If used, they may not render correctly for people reading the email in
	* a different browser than the one from which the email was sent.
	* - The use of state-dependent styles (like a:hover) don't work because they
	* don't match at the time the styles are made explicit. (In email, styles
	* must be explicitly applied to all elements -- stylesheets get stripped.)
	*/

	#!/usr/bin/env python
	# Ported to Python from http://www.vim.org/scripts/script.php?script_id=1349

	print "Color indexes should be drawn in bold text of the same color."
	print

	colored = [0] + [0x5f + 40 * n for n in range(0, 5)]
	colored_palette = [
	"%02x/%02x/%02x" % (r, g, b)
	for r in colored

Trey Harris treyharris

Why the ident attribute doesn't work in Git like in CVS or SVN

How do you do it?

Why the `ident` attribute doesn't work in Git like in CVS or SVN