Checkout the Last Public Revision with Mercurial

By  on  

I've always preferred git over Mercurial (hg) because the feature branch workflow makes organizing code and working off of master very easy. You don't get that with vanilla mercurial -- instead, commits can just sort of apply on top of each other, without much organization. Sometimes mercurial can feel a bit chaotic.

When working on Mozilla's mozilla-central repository (for your beloved Firefox!), I always start new commits off of the latest public commit. "public means it has been merged into mozilla-central, "draft" means it was created locally and is only on my machine.

Getting the last public revision ID required a bit of command line hackery and search so I found a better way to check out the last public revision:

hg checkout -r 'last(public())'

That command is a bit much to remember so I created an alias in my .bash_profile:

alias hgmaster='hg checkout -r “last(public())”’

As with every alias I create, whether a git alias or a bash alias, I wish I had created this sooner -- I'd have saved so much time!

Recent Features

  • By
    Responsive and Infinitely Scalable JS Animations

    Back in late 2012 it was not easy to find open source projects using requestAnimationFrame() - this is the hook that allows Javascript code to synchronize with a web browser's native paint loop. Animations using this method can run at 60 fps and deliver fantastic...

  • By
    Introducing MooTools Templated

    One major problem with creating UI components with the MooTools JavaScript framework is that there isn't a great way of allowing customization of template and ease of node creation. As of today, there are two ways of creating: new Element Madness The first way to create UI-driven...

Incredible Demos

  • By
    MooTools 1.2 Image Protector: dwProtector

    Image protection is a hot topic on the net these days, and why shouldn't it be? If you spent two hours designing an awesome graphic, would you want it ripped of in matter of seconds? Hell no! That's why I've created an image...

  • By
    Image Manipulation with PHP and the GD Library

    Yeah, I'm a Photoshop wizard. I rock the selection tool. I crop like a farmer. I dominate the bucket tool. Hell, I even went as far as wielding the wizard wand selection tool once. ...OK I'm rubbish when it comes to Photoshop.

Discussion

  1. Jeremy

    What do you mean you can’t use the feature branch workflow with Mercurial?

    • I guess branches are different with Mercurial, and that bookmarks don’t feel the same as branching off of master. Could just be me.

  2. glob

    It would be simpler/quicker to instead do:

    hg checkout -r 'last(public())'
  3. agentgt

    You can also use mercurials excellent revsetalias and alias support:

    [alias]
    master = update -r 'last(public())'
    
    [revsetalias]
    master = last(public())
    wip = (parents(not public()) or not public() or . or head()) and not closed()
    

    Now You can do

    hg update master
    

    or

    hg master
    

    I added the revset alias wip as well which shows the changes you haven’t yet pushed to master.

    Finally for lightweight branches I highly recommend the evolve extension and just making normal mercurial named branches that you only push to your local mutable (non publishing repository). So long as the branches are in draft you can delete them which will be the case if the repository is non publishing.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!