#+TITLE: Cscope layer

[[file:img/cscope.jpg]]

* Table of Contents                                         :TOC_4_gh:noexport:
 - [[#description][Description]]
 - [[#install][Install]]
   - [[#layer][Layer]]
   - [[#cscope][Cscope]]
   - [[#pycscope][PyCscope]]
 - [[#usage][Usage]]
 - [[#key-bindings][Key bindings]]

* Description
This layer provides bindings for using [[http://cscope.sourceforge.net][Cscope]] and [[https://github.com/portante/pycscope][PyCscope]] in Spacemacs.

=Cscope= provides indexing and searching capabilities for C and C++ code.
=PyCscope= extends these capabilities for Python code as well. See
[[https://github.com/OpenGrok/OpenGrok/wiki/Comparison-with-Similar-Tools][here]] for a comparison between =Cscope= and other similar tools (such as gtags).

* Install
** Layer
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =cscope= to the existing =dotspacemacs-configuration-layers= list in this
file.

** Cscope
Install =Cscope= through your package manager, or download it from the
[[http://cscope.sourceforge.net/#downloads][website]] and build it from source.

From package manager (for example, Ubuntu):

#+BEGIN_SRC sh
sudo apt-get install cscope
#+END_SRC

From source:

#+BEGIN_SRC sh
tar xvf cscope-15.8b
cd cscope-15.8b
./configure
make
sudo make install
#+END_SRC

** PyCscope
Install PyCscope through pip:

#+BEGIN_SRC sh
pip install pycscope
#+END_SRC

* Usage
Before using any helm-cscope commands, remember to create a Cscope index file.
Do it by running the command =cscope-index-files= for C and C++ projects, or the
command =cscope/run-pycscope= for Python projects, bound to ~SPC m g i~.

* Key bindings

| Key Binding | Description                                   |
|-------------+-----------------------------------------------|
| ~SPC m g c~ | find which functions are called by a function |
| ~SPC m g C~ | find where a function is called               |
| ~SPC m g d~ | find global definition of a symbol            |
| ~SPC m g e~ | search regular expression                     |
| ~SPC m g f~ | find a file                                   |
| ~SPC m g F~ | find which files include a file               |
| ~SPC m g i~ | create Cscope index                           |
| ~SPC m g r~ | find references of a symbol                   |
| ~SPC m g x~ | search text                                   |