Support autoloading session for the current git repository (#128)

Author: nuchs

README.md

@@ -12,14 +12,15 @@ The plugin saves the sessions in the specified folder (see [configuration](#conf
 
 Use the command `:SessionManager[!]` with one of the following arguments:
 
-| Argument                     | Description                                                                                                                                                        |
-| -----------------------------| ------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
-| `load_session`               | Select and load session. (Your current session won't appear on the list).                                                                                          |
-| `load_last_session`          | Removes all buffers and tries to `:source` the last saved session. Returns `true` if the session was restored and `false` otherwise.                               |
-| `load_current_dir_session`   | Removes all buffers and tries to `:source` the last saved session file of the current directory. Returns `true` if the session was restored and `false` otherwise. |
-| `save_current_session`       | Works like `:mksession`, but saves/creates current directory as a session in `sessions_dir`.                                                                       |
-| `delete_session`             | Select and delete session.                                                                                                                                         |
-| `delete_current_dir_session` | Deletes the session associated with the current directory.                                                                                                         |
+| Argument                     | Description                                                                                                                                                                             |
+| -----------------------------| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `load_session`               | Select and load session. (Your current session won't appear on the list).                                                                                                               |
+| `load_last_session`          | Removes all buffers and tries to `:source` the last saved session. Returns `true` if the session was restored and `false` otherwise.                                                    |
+| `load_current_dir_session`   | Removes all buffers and tries to `:source` the last saved session of the current directory. Returns `true` if the session was restored and `false` otherwise.                           |
+| `load_git_session`           | When in a git repo, removes all buffers and tries to `:source` the last saved session of the git repo root directory. Returns `true` if the session was restored and `false` otherwise. |
+| `save_current_session`       | Works like `:mksession`, but saves/creates current directory as a session in `sessions_dir`.                                                                                            |
+| `delete_session`             | Select and delete session.                                                                                                                                                              |
+| `delete_current_dir_session` | Deletes the session associated with the current directory.                                                                                                                              |
 
 When `!` is specified, the modified buffers will not be saved.
 
@@ -54,11 +55,12 @@ require('session_manager').setup({
 
 If Neovim is started without arguments the value of the autoload_mode option is used to determine which session to initially load. The following modes are supported:
 
-| Mode        | Description                                                  |
-| ----------- | ------------------------------------------------------------ |
-| Disabled    | No session will be loaded.                                   |
-| CurrentDir  | The session in the current working directory will be loaded. |
-| LastSession | The last session will be loaded. This is the default.        |
+| Mode        | Description                                                     |
+| ----------- | --------------------------------------------------------------- |
+| Disabled    | No session will be loaded.                                      |
+| CurrentDir  | The session in the current working directory will be loaded.    |
+| LastSession | The last session will be loaded. This is the default.           |
+| GitSession  | If in a git repo the session for repository root will be loaded |
 
 `autoload_mode` can be set to either a single mode or an array of modes, in which
 case each mode will be tried until one succeeds e.g.

lua/session_manager/config.lua

@@ -9,6 +9,7 @@ local config = {
     'Disabled',
     'CurrentDir',
     'LastSession',
+    'GitSession',
   }),
 }
 

lua/session_manager/init.lua

@@ -1,6 +1,7 @@
 local config = require('session_manager.config')
 local AutoloadMode = require('session_manager.config').AutoloadMode
 local utils = require('session_manager.utils')
+local Job = require('plenary.job')
 local session_manager = {}
 
 --- Apply user settings.
@@ -66,6 +67,25 @@ function session_manager.load_current_dir_session(discard_current)
   return false
 end
 
+--- If in a git repo, tries to load a session for the repo's root directory
+---@return boolean: `true` if session was loaded, `false` otherwise.
+function session_manager.load_git_session(discard_current)
+  local job = Job:new({
+    command = 'git',
+    args = { 'rev-parse', '--show-toplevel' },
+  })
+  job:sync()
+  local git_dir = job:result()[1]
+  if git_dir then
+    local session = config.dir_to_session_filename(git_dir)
+    if session:exists() then
+      utils.load_session(session.filename, discard_current)
+      return true
+    end
+  end
+  return false
+end
+
 --- Saves a session for the current working directory.
 function session_manager.save_current_session()
   local cwd = vim.uv.cwd()
@@ -78,6 +98,7 @@ local autoloaders = {
   [AutoloadMode.Disabled] = function() return true end,
   [AutoloadMode.CurrentDir] = session_manager.load_current_dir_session,
   [AutoloadMode.LastSession] = session_manager.load_last_session,
+  [AutoloadMode.GitSession] = session_manager.load_git_session,
 }
 
 --- Loads a session based on settings. Executed after starting the editor.