Go command line tool : how to launch a text editor and grab the user input ?

[joseph...@gmail.com]

Hello

I would like to create a command line tool where the user can add comment "the git way", ie the workflow for a command line tool named "tool" would be the following:

1. The user types the following on the command line:

$> tool answer

2. The software opens the default text editor (or vi as a fallback)

3. the user types his text

4. on the user leaving the text editor, the input is taken by the software

It's basically a simple "git commit"

Is it possible and if so how ? My trials using the package Exec did all failed...

Thanks in advance

Joseph

[Gabriel Comeau]

While I'm not familiar with the git internals I've seen enough evidence of this to suspect this is how they do it:

1)  exec the text editor with a filename in place (vim $PROJECT_ROOT/.git/COMMIT_EDITMSG is what git looks to be doing, evidenced by the fact that there's a COMMIT_EDITMSG.swp while the message is still open)

2)  Once the exec is over (the user saved and quit from the editor) read the file and get your input from there.  Handle errors where the file is empty / doesn't exist (aborted commit)

3)  Once you've validated the input, you should probably delete the temp file.

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[Joseph Pachod]

Hi all

Stupid me, that was my original plan but somehow I forgot on the way while digging into Go...

Thanks a lot, back to coding ! :)

[joseph...@gmail.com]

Hi

End of coding for tonight, current state at https://gist.github.com/cluelessjoe/9476219

doesn't work currently :

./main

vim is available at /usr/bin/vim

Calling it with file /var/folders/4r/b51g0pl93sv6gdgx7vxh7r8m0000gp/T/tempFilePrefix283772469

Waiting for command to finish...Command finished with error: exit status 1

If anyone can help, great, otherwise digging in again tomorrow night :)

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[Martin Hilton]

You need to wire in the standard file descriptors.

e.g. http://play.golang.org/p/ixS9g4RveQ

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[joseph...@gmail.com]

It works, thanks a lot :)

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