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I wanted to write a bash alias for the git commit command. I typically use it like so: git commit -m "my message here", so I wrote an alias like this:

alias commit='git commit'

which allows me to do this:

$ commit -m "My message"

However, then I thought I could also update my alias to remove the -m option, getting me

$ commit "my message"

Then I thought, "Do I even need to type the quotes?" What I envisioned was this:

$ commit
> My message here

Where > is the quote-continuation prompt you get when you are type enter in a quoted string:

$ git commit -m "I am about to hit the enter key
> 

And it completes the command when I hit enter.

Is there any way I can script this behavior in bash?

Bonus: the command aborts when I hit Ctrl+c.

  • 2
    It appears you want to re-implement git commit without the -m option. – glenn jackman Apr 26 '19 at 13:35
  • @glennjackman A fair assessment-- but with the caveat that I still want its feature. – user394 Apr 26 '19 at 13:41
1

I wonder if you want this function:

commit() {
    if (( $# == 0 )); then
        command git commit  # no `-m`: invoke an editor
    else
        command git commit -m "$*"
    fi
}

As you don't want to open an editor, perhaps:

commit() {
    [[ $# -eq 0 ]] && set -- A default commit message here.
    command git commit -m "$*"
}
  • My git doesn't behave this way $ git commit On branch master nothing to commit, working directory clean $ git version git version 2.7.4 – user394 Apr 26 '19 at 13:46
  • You have to do something commit worthy first: touch some_file; git add some_file; git commit – glenn jackman Apr 26 '19 at 13:54
  • Ah, okay, I see, thanks. I don't want to open an editor; I just want to avoid typing quote marks. – user394 Apr 26 '19 at 14:08
  • 1
    expanded my answer. – glenn jackman Apr 26 '19 at 14:32
  • So now I have the command where I can write commit this is my commit message. But I wonder, can I get it so that I type commit, hit enter, and get a prompt like this: >, where I type my commit message, and cancel with Ctrl+c? – user394 Apr 26 '19 at 20:52
4

You could write a function that uses bash's read -e:

commit() {
  local commitlog
  IFS= read -rep '> ' commitlog &&
     git commit -m "$commitlog" "$@"
}

read -e lets you insert a litterral newline by pressing Ctrl+VCtrl+J, but because read reads only one line, everything past the first newline will be discarded.

You can work around that by adding a -d $'\r' option to read, but then I found that at least with version 5.0.7 and 4.4.19, that messes up the handling of Enter afterwards at the prompt.

In any case, it's easier in zsh:

commit() {
  local commitlog=
  vared -ep '> ' commitlog &&
    git commit -m "$commitlog" "$@"
}

Where newline can be entered with Ctrl+VCtrl+J like in bash or with Alt+Enter

Or with history (here shared and avoiding duplicates):

commit() {
  emulate -L zsh
  setopt sharehistory histignorealldups histsavenodups
  local commitlog=
  fc -ap ~/.zcommit-history 500
  vared -ehp '> ' commitlog || return
  print -rs -- "$commitlog"
  git commit -m "$commitlog" "$@"
}

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