In a ruby script, how to ask git to open its message editor

Question

I'm currently working on a command-line ruby gem that automates the "rebase + no-ff merging" workflow discussed at https://gist.github.com/jbenet/ee6c9ac48068889b0912. You can find the WIP code for this gem at https://github.com/gsmendoza/git_pretty_accept/tree/git_pretty_accept. The gem would do something like this:

git co master
git pull
git co pull_request
git rebase master
git co master
git merge --edit --no-ff pull_request
git push
git branch -d pull_request
git push origin:pull_request

When I try to run these git commands via ruby, git merge --edit --no-ff pull_request doesn't open the git commit message editor like I hope it would. Instead, I think git just receives a blank merge message from the editor and ruby continues with the rest of the script.

Any ideas?

miaout17 · Accepted Answer · 2013-11-09 08:03:22Z

0

Just read your code.

`git merge --no-ff --message "#{merge_message}" #{branch}`

In Ruby, this backtick syntax redirects the STDIN and STDOUT.

Simply try this instead:

system("git merge --edit --no-ff #{branch}")

The system function just forks a process and wait for the subprocess finish, without touching STDIN/STDOUT. I tested and it works.

edited Nov 9, 2013 at 8:03

answered Nov 9, 2013 at 7:55

miaout17

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3 Comments

gsmendoza Over a year ago

Yeah, I tweaked the git merge call in this question. In the gem, I used the --message option. However, I would prefer to use --edit instead. Will still try using system instead of backticks because that was also what was recommended in this separate question (stackoverflow.com/questions/19873593/…). Thanks!

miaout17 Over a year ago

Edited. I have tried --edit before answering and it works. Just copy & paste mistake.

gsmendoza Over a year ago

It does! And I thought I needed to call some IO.pipe magicky :)

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