Question

Let´s say I have two branches, default and mybranch, I would like to write a small script to see:

1. How often mybranch merges with default (changes goes from mybranch to default)
2. How often mybranch merges from default (changes goes from default into mybranch)

Some pseudocode for #1:

    m_lastmergetime = 0
    for each m in [all merges with default from mybranch]
        m_mergetime = m.date_in_hours
        m_timebetweenmerges = m_mergetime - m_lastmergetime
        if m_lastmergetime > 0
            print m_timebetweenmerges

Sub.steps:

1. A Mercurial query which matches all merges with default from mybranch
2. A style for Mercurial which shows the date in hours
3. Calculate the time between merges as in the above pseudocode using Bash or Python

Case #2 will be pretty similar. I only need:

1. A Mercurial query which matches all merges with mybranch from default

Answer 1

To find all the changesets on branch X that was merged in from branch Y you would issue the following Mercurial command:

hg log --rev "children(branch(X)) and children(branch(Y)) and branch(X)"

To find everything on branch Y that was merged in from branch X (ie. the opposite direction), simply change the last branch name there to Y:

hg log --rev "children(branch(X)) and children(branch(Y)) and branch(Y)"
                              ^                       ^              ^
                              +------ leave these ----+              |
                                                                     |
                                      but change this ---------------+

Basically the query says that you want all changesets that:

• is a child of any of the changesets on branch X
• is also a child of any of the changesets on branch Y (only merge changesets have two parents, and can thus be a child of changesets on two branches at the same time)
• is on branch Y (so you merged to branch Y)