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Posted by Nate Murray - Jul 23, 20081

Mac OS X color showing ESC[whatever for git-diff colors (and more)

Since my upgrade to OS X 10.5 I have been having a terrible time getting colors to work with git.

Originally I was using OS X 10.5.4, git version 1.5.3.1, and iTerm or Terminal.app. $TERM=xterm or xterm-color. I have color with PS1, ls, vim and most git tasks. However, git diff (or git show) always screws up the diff by showing the ESC[ characters instead of colors. For instance:

  [nathan@nate ~/s3]$ git show 67d254ec17f
  ESC[33mcommit 67d254ec17fdc507765ddee1feb2a14e5896e79fESC[m

I searched and searched wasn’t able to figure out how to fix this. It was suggested on the github forum that I upgrade to git 1.5.6.4. Unfortunately not only did it not fix the color in git diff, it broke the color in git status which was working previously.

After about a week of poking around on and off I discovered that the problem was not git, but my GIT_PAGER which is more. If I tried GIT_PAGER=cat git-diff then the color output just fine. less and more use the same environment variable LESS (man less for details). And less was outputting the colors as raw escape codes.

man less shows that the option -R is defined as follows:

       -R or --RAW-CONTROL-CHARS
              Like  -r,  but  only  ANSI "color" escape
              sequences are output in "raw" form.

That would do it.

After perusing the man page for a while I settled on adding this to my
~/.profile:

  export LESS="-erX"

At the end of the day, this tip is really about less and how it interprets colors and probably has little to do with git. Even so, I only found this odd behavior while using git. Hopefully this post will help someone who is having similar issues.

As a side note, below is an example of how to configure your colors for git-diff and other commands. 

[user]
    name = Your Name
    email = y...@yours.com
[color]
    branch = auto
    status = auto
    diff = auto
[color "diff"]
    meta = yellow
    frag = cyan
    old = red
    new = green
[color "branch"]
    current = yellow reverse
    local = yellow
    remote = green
[color "status"]
    added = yellow
    changed = green
    untracked = cyan
[alias]
    st = status
    ci = commit
    co = checkout
    br = branch
Posted by Matt Pulver - Jul 6, 20083

ActiveRecord from_json and from_xml

Unless I’m missing something, the default rails from_json and from_xml methods don’t work with data that have associated objects. Here are routines that work for some simple examples I’ve tested. I placed this code in vendor/rails/activerecord/lib/active_record/base.rb within the ActiveRecord::Base class, but there might be a better place to put it.

Also available on pastie.

Example usage, using the to_xml example:

Note: this only works if the classes of the nested objects are canonically named. If any of your associations use the :class_name option, you will probably need to update this code to discover the proper class names.

I just wrote this a couple hours ago, so please consider this to be an alpha version.

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