Open::This - Try to Do the Right Thing when opening files

version 0.000034

This module powers the ot command line script, which tries to do the right thing when opening a file. Imagine your $ENV{EDITOR} is set to vim. (This should also work for emacs and nano.) The following examples demonstrate how your input is translated when launching your editor.

ot Foo::Bar # vim lib/Foo/Bar.pm
ot Foo::Bar # vim t/lib/Foo/Bar.pm

Imagine this module has a sub do_something at line 55.

ot "Foo::Bar::do_something()" # vim +55 lib/Foo/Bar.pm

Or, when copy/pasting from a stack trace. (Note that you do not need quotes in this case.)

ot Foo::Bar line 36 # vim +36 lib/Foo/Bar.pm

Copy/pasting a git-grep result.

ot lib/Foo/Bar.pm:99 # vim +99 Foo/Bar.pm

Copy/pasting a partial GitHub URL.

ot lib/Foo/Bar.pm#L100 # vim +100 Foo/Bar.pm

Copy/pasting a full GitHub URL.

ot https://github.com/oalders/open-this/blob/master/lib/Open/This.pm#L17-L21
# vim +17 lib/Open/This.pm

Open a local file on the GitHub web site in your web browser. From within a checked out copy of https://github.com/oalders/open-this

ot -b Foo::Bar

Open a local file at the correct line on the GitHub web site in your web browser. From within a checked out copy of https://github.com/oalders/open-this:

ot -b Open::This line 50
# https://github.com/oalders/open-this/blob/master/lib/Open/This.pm#L50

This code has been well tested with vim. It should also work with nvim, emacs, pico, nano and kate. Patches for other editors are very welcome.

Given a scalar value or an array of scalars, this function will try to extract useful information from it. Returns a hashref on success. Returns undef on failure. file_name is the only hash key which is guaranteed to be in the hash.

use Open::This qw( parse_text );
my $parsed = parse_text('t/lib/Foo/Bar.pm:32');

# $parsed = { file_name => 't/lib/Foo/Bar.pm', line_number => 32, }

my $with_sub_name = parse_text( 'Foo::Bar::do_something()' );

# $with_sub_name = {
#     file_name     => 't/lib/Foo/Bar.pm',
#     line_number   => 3,
#     original_text => 't/lib/Foo/Bar.pm:32',
#     sub_name      => 'do_something',
# };

Given a scalar value, this calls parse_text() and returns an array of values which can be passed at the command line to an editor.

my @args = to_editor_args('Foo::Bar::do_something()');
# @args = ( '+3', 't/lib/Foo/Bar.pm' );

If you have a hashref from the parse_text function, you can get editor args via this function. (The faster way is just to call to_editor_args directly.)

my @args
    = editor_args_from_parsed_text( parse_text('t/lib/Foo/Bar.pm:32') );

Tries to return an URL to a Git repository for a checked out file. The URL will be built using the origin remote and the name of the current branch. A line number will be attached if it can be parsed from the text. This has only currently be tested with GitHub URLs and it assumes you're working on a branch which has already been pushed to your remote.

my $url = maybe_get_url_from_parsed_text( parse_text('t/lib/Foo/Bar.pm:32'));
# $url might be something like: https://github.com/oalders/open-this/blob/master/lib/Open/This.pm#L32

By default, ot will search your lib and t/lib directories for local files. You can override this via the $ENV{OPEN_THIS_LIBS} variable. It accepts a comma-separated list of libs.

If you're a vim user, you can use the following code to your .vimrc to integrate ot directly with your editor.

" Thanks to D. Ben Knoble for getting histadd() to work:
" https://vi.stackexchange.com/questions/34818/how-to-use-histadd-with-a-custom-function/34819#34819
nnoremap <leader>ot :call OT(input("ot: ", "", "file"))<cr>

" trim() requires vim 8
" https://github.com/vim/vim/commit/295ac5ab5e840af6051bed5ec9d9acc3c73445de
function! OT(fname)
    let res = system("ot --editor vim --print " . shellescape(trim(a:fname)))
    if v:shell_error
        echo "\n" . res
    else
        execute "e " res
    endif
    call histadd(':', printf('call OT("%s")', escape(a:fname, '"\')))
endfunction

With the above code, you can enter <leader>ot and then enter your ot args directly in vim. If the file is found, it will be opened in a buffer, hopefully at the appropriate line and column number. An up to date copy of this command should generally be available in my dotfiles repo as well: https://github.com/oalders/dot-files/blob/main/vim/vimrc.

Olaf Alders [email protected]

This software is copyright (c) 2018 by Olaf Alders.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.