Questions & Help>Questions

How to get function definition file and line?

#function
fchabouis

fchabouis

How to get function definition file and line?

I would like to know if there is a way, in a mix project, to get information about where a function is defined?
I would like, given a module name and function name, to know that this function is defined line 8 of foo.ex file. I guess it is possible to find information like this, as we get lines number when running tests or for compiler warnings.
Thanks!

10 comments
#function
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Marked As Solved

fchabouis

fchabouis

Thanks, I have all the information I need :heart:
Phoenix.Router.route_info to know which module + function is called
module.module_info() for the source file path
Code.fetch_docs/1 for the line number

3
Post #8

Also Liked

hauleth

hauleth

It is in the metadata of module itself. Just check out module.module_info().

4
Post #7
fchabouis

fchabouis

@ambareesha7 No blog post, but I made a PR on Phoenix that just got merged!

4
Post #10
hauleth

hauleth

You can try to extract that information from the Code.fetch_docs/1. It will not always be 100% precise (as if there is documentation, then it will point to the line for documentation), but works well enough, especially in presence of multiple heads.

3
Post #4
LostKobrakai

LostKobrakai

Phoenix.Router — Phoenix v1.6.6 can give you the plug / plug_opts (action). But MyController.action/2 can be overwritten, so you cannot be sure that MyController, :index actually calls MyController.index/2.

2
Post #5
fchabouis

fchabouis

In my case, I don’t think there is any overwriting, so that would be good enough!
I found how to get the module and function name with Phoenix.Router.route_info.
Code.fetch_docs/1 seems to be giving the line number in the file (thanks @hauleth ), I am just missing the name of the file :slight_smile:

1
Post #6

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