vim：通过正则表达式复制并粘贴

Question

I'm looking to write a vim macro (not that I know how yet) eventually, as I'm sure I can do this in vim, but I don't know the basics yet.

I want to grab the branch name (or part of it anyway - that part of the regex should be straightforward) from a git commit message, and paste it, with a colon, to the top of the file, and hopefully leave the cursor at the end of that.

So the file looks a bit like this when I start:

$ <-- cursor here
# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# On branch JIRA-1234-some-description-here
# Your branch is up to date with ...

I want to capture the /On branch \\([AZ]*-[0-9]*\\)/ , move back up to the top, paste it, and a colon, leaving the cursor after the colon, eg:

JIRA-1234: $ <-- cursor here
# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# On branch JIRA-1234-some-description-here
# Your branch is up to date with ...

Ideally, also leave me in insert mode there.

Answer 1

Assuming you are using fugitive.vim you can use fugitive#head() to get the current branch name. You can probably do something like this (put in vimrc file):

augroup MyCommit
    autocmd!
    autocmd FileType gitcommit call setline(1, substitute(fugitive#head(), '^\([A-Z]\+-[0-9]\+\).*', '\1: ', ''))
augroup END

Note: I have not tested this in anyway.

Answer 2

You could use this function:

function! MyFunction()                                                      
  g/On branch \([A-Z]*-[0-9]*\)/exe "co0 | 1s/.* \\(.*-\\d\\+\\).*/\\1:/g"
  normal $                                                                  
endfunction     

and then map it:

nmap <leader>f :call MyFunction()<cr>                   

Explanation of function: the global command g/{pat}/[cmd] executes the command [cmd] on lines where pattern {pat} matches. You've already provided {pat} in your question. Then, to execute more than one command I recommend to use exe . Here exe copies the matched line to the first line ( co0 ) and performs the replacement ( 1s/.../\\\\1:/g ).