Re: [PATCH v2 0/9] rebase -i: add config to abbreviate command names

> This series will add the 'rebase.abbreviateCommands' configuration
> option to allow `git rebase -i` to default to the single-letter command
> names when generating the todo list.
> 
> Using single-letter command names can present two benefits. First, it
> makes it easier to change the action since you only need to replace a
> single character (i.e.: in vim "r<character>" instead of
> "ciw<character>").  Second, using this with a large enough value of
> 'core.abbrev' enables the lines of the todo list to remain aligned
> making the files easier to read.
> 
> Changes in V2:
> - Refactor and rename 'transform_todo_ids'
> - Replace SHA-1 by OID in rebase--helper.c
> - Update todo list related functions to take a generic 'flags' parameter
> - Rename 'add_exec_commands' function to 'sequencer_add_exec_commands'
> - Rename 'add-exec' option to 'add-exec-commands'
> - Use 'strbur_read_file' instead of rewriting it
> - Make 'command_to_char' return 'comment_char_line' if no single-letter
>   command name is defined
> - Combine both tests into a single test case
> - Update commit messages