[go-nuts] Emacs and Code Navigation

You could always right a module/plugin for emacs that does this. I find a
normal search works just fine or grep if the codebase is large.

--

I'd also be interested in any good answers to this question. My method is a
bit manual but works OK (assuming Ubuntu or similar):

sudo apt-get install exuberant-ctags

etags --list-languages

# Go to source tree containing some Go code
etags -Re *

vi .emacs # This step requires a text editor

(require 'etags-select)

More information on etags-select can be found at:
http://marmalade-repo.org/packages/etags-select

If you use the most excellent Ido mode then the following function is also
good


;; Use ido to list tags, but then select via etags-select (best of
both worlds!)
(defun my-ido-find-tag ()
"Find a tag using ido"
(interactive)
(tags-completion-table)
(let (tag-names)
(mapatoms (lambda (x)
(push (prin1-to-string x t) tag-names))
tags-completion-table)
(etags-select-find (ido-completing-read "Tag: " tag-names))))
(global-set-key (kbd "M-.") 'my-ido-find-tag)




--

Thank you for the pointers. I will try them out.
Another question, how can I use gofmt inside of Emacs? I am fairly new to
Emacs but I know I can launch a shell command and do "gofmt" but my file in
Emacs doesn't change and I have to close and re-open it to see the changes.
Is there any shortcut or anyway that I could run the gofmt command and
have Emacs automatically reload the updated file?

Luke

Better yet use this in your .emacs

(require 'go-mode)(add-hook 'before-save-hook #'gofmt-before-save)


other wise use


M-x gofmt


bwt you can use godoc inside emacs


M-x godoc


then type net/http to see an example.


The other mode i find is helpful is go-play (google for it) you can post any buffer to play.golang.org

I added that code to my .emacs and now when I save, emacs invokes gofmt and
it shows me the differences but my question is, how do I apply those
differences to the file I am editing and save it? I am sure there must be
some command to do it but I have been unable to find it.

Luke

Luke Mauldin <lukemauldin@gmail.com>
writes:
You may have an older version of the emacs plugin. There was an issue
like this that was fixed a while back.

Dustin,

I just downloaded a version of the emacs plugin from TIP and I configured
my emacs version to use that plugin. I then followed the same steps I
followed before to edit the file and when I clicked save I still get the
"Gofmt patch" buffer as shown in the screenshot. Is there some command I
need to use to apply the changes or do I need to submit a bug report? I am
attaching a screenshot.

Luke

Answering an earlier question, you can run gofmt over your code in a buffer
as follows

control-x h This is mark-whole-buffer, which sets the region
to be the whole buffer.
control-u This is universal -argument, which alters the
next command
Escape | This is shell-command-on-region, it will prompt
you for a command, and you answer gofmt

This will take your buffer, pass it as stdin to the command, and put the
output back in place of the contents of the buffer. If something goes wrong
then you can just use control-underscore or control-x u or control-/ (or if
you have the menu then "undo" from the edit menu) to get your code back.

--

Luke Mauldin <lukemauldin@gmail.com>
writes:
Interesting. You're using Windows (which I don't know at all). I
didn't find that fix until I went through the effort of doing it
myself. The implementation that went in was a little odd in that it
had some custom logic for determining what the temporary directory is
instead of just asking.

You can see the bug here:

http://code.google.com/p/go/issues/detail?id=3782

You might try my suggestion I mentioned in the bug. I suspect that
would help, but if not, I think it'll at least give you the area to
look.

I tried your suggestion and it still didn't work. I think Emacs with gofmt
on save is just broken on Windows and unfortunately I don't have enough
Emacs experience to fix it. I submitted a issue 4475.

Luke