Pass plugin names as arguments (#788)

Author: jorgebucaran

Diff for: README.md

@@ -130,22 +130,22 @@ Non `.fish` files and directories inside these locations will be copied to `$fis
 
 ### Event system
 
-Fish [events](https://fishshell.com/docs/current/cmds/emit.html) notify plugins when they're being installed, updated, or removed.
+Fisher notifies plugins when they're being installed, updated, or removed via [events](https://fishshell.com/docs/current/cmds/emit.html). Each relevant event handler is invoked with the plugin's name supplied as the first argument.
 
-> Keep in mind, `--on-event` functions must be loaded when their event is emitted. So, place your event handlers in the `conf.d` directory.
+> Place your event handler functions in the `conf.d` directory to ensure they're loaded and ready when needed.
 
 ```fish
 # Defined in flipper/conf.d/flipper.fish
 
-function _flipper_install --on-event flipper_install
+function _flipper_install --on-event flipper_install --argument-names plugin
     # Set universal variables, create bindings, and other initialization logic.
 end
 
-function _flipper_update --on-event flipper_update
+function _flipper_update --on-event flipper_update --argument-names plugin
     # Migrate resources, print warnings, and other update logic.
 end
 
-function _flipper_uninstall --on-event flipper_uninstall
+function _flipper_uninstall --on-event flipper_uninstall --argument-names plugin
     # Erase "private" functions, variables, bindings, and other uninstall logic.
 end
 ```

Diff for: functions/fisher.fish

@@ -132,7 +132,7 @@ function fisher --argument-names cmd --description "A plugin manager for Fish"
 
                     if contains -- "$plugin" $remove_plugins
                         for name in (string replace --filter --regex -- '.+/conf\.d/([^/]+)\.fish$' '$1' $$plugin_files_var)
-                            emit {$name}_uninstall
+                            emit {$name}_uninstall $plugin
                         end
                         printf "%s\n" Removing\ (set_color red --bold)$plugin(set_color normal) "         "$$plugin_files_var | string replace -- \~ ~
                         set --erase _fisher_plugins[$index]
@@ -188,7 +188,7 @@ function fisher --argument-names cmd --description "A plugin manager for Fish"
                 for file in (string match --regex -- '.+/[^/]+\.fish$' $$plugin_files_var | string replace -- \~ ~)
                     source $file
                     if set --local name (string replace --regex -- '.+conf\.d/([^/]+)\.fish$' '$1' $file)
-                        emit {$name}_$event
+                        emit {$name}_$event $plugin
                     end
                 end
             end