Remote control: Allow matching windows by the environment variables of their child process as well

docs/changelog.rst

@@ -19,6 +19,9 @@ Changelog
 - macOS: Allow scrolling window contents using mouse wheel/trackpad even when the
   window is not the active window (:iss:`729`)
 
+- Remote control: Allow matching windows by the environment variables of their
+  child process as well
+
 0.11.3 [2018-07-10]
 ------------------------------
 

kitty/boss.py

@@ -152,6 +152,13 @@ class Boss:
                     return
                 if w is not None:
                     yield w
+            return
+        if field == 'env':
+            kp, vp = exp.partition('=')[::2]
+            if vp:
+                pat = tuple(map(re.compile, (kp, vp)))
+            else:
+                pat = re.compile(kp), None
         else:
             pat = re.compile(exp)
         for window in self.all_windows:

kitty/cmds.py

@@ -46,18 +46,20 @@ def cmd(short_desc, desc=None, options_spec=None, no_response=False, argspec='..
 MATCH_WINDOW_OPTION = '''\
 --match -m
 The window to match. Match specifications are of the form:
-:italic:`field:regexp`. Where field can be one of: id, title, pid, cwd, cmdline, num.
+:italic:`field:regexp`. Where field can be one of: id, title, pid, cwd, cmdline, num, env.
 You can use the :italic:`ls` command to get a list of windows. Note that for
 numeric fields such as id, pid and num the expression is interpreted as a number,
 not a regular expression. The field num refers to the window position in the current tab,
 starting from zero and counting clockwise (this is the same as the order in which the
 windows are reported by the :italic:`ls` command). The window id of the current window
-is available as the KITTY_WINDOW_ID environment variable.
+is available as the KITTY_WINDOW_ID environment variable. When using the :italic:`env` field
+to match on environment variables you can specify only the environment variable name or a name
+and value, for example, :italic:`env:MY_ENV_VAR=2`
 '''
 MATCH_TAB_OPTION = '''\
 --match -m
 The tab to match. Match specifications are of the form:
-:italic:`field:regexp`. Where field can be one of: id, title, pid, cwd, cmdline.
+:italic:`field:regexp`. Where field can be one of: id, title, pid, cwd, env, cmdline.
 You can use the :italic:`ls` command to get a list of tabs. Note that for
 numeric fields such as id and pid the expression is interpreted as a number,
 not a regular expression. When using title or id, first a matching tab is
@@ -72,8 +74,8 @@ for that window is used.
     'List all windows. The list is returned as JSON tree. The top-level is a list of'
     ' operating system {appname} windows. Each OS window has an :italic:`id` and a list'
     ' of :italic:`tabs`. Each tab has its own :italic:`id`, a :italic:`title` and a list of :italic:`windows`.'
-    ' Each window has an :italic:`id`, :italic:`title`, :italic:`current working directory`, :italic:`process id (PID)` and'
-    ' :italic:`command-line` of the process running in the window.\n\n'
+    ' Each window has an :italic:`id`, :italic:`title`, :italic:`current working directory`, :italic:`process id (PID)`, '
+    ' :italic:`command-line` and :italic:`environment` of the process running in the window.\n\n'
     'You can use these criteria to select windows/tabs for the other commands.'.format(appname=appname),
     argspec=''
 )

kitty/window.py

@@ -140,7 +140,9 @@ class Window:
             id=self.id,
             title=self.override_title or self.title,
             pid=self.child.pid,
-            cwd=self.child.current_cwd or self.child.cwd, cmdline=self.child.cmdline
+            cwd=self.child.current_cwd or self.child.cwd,
+            cmdline=self.child.cmdline,
+            env=self.child.environ,
         )
 
     @property
@@ -161,6 +163,12 @@ class Window:
                 if pat.search(x) is not None:
                     return True
             return False
+        if field == 'env':
+            key_pat, val_pat = pat
+            for key, val in self.child.environ.items():
+                if key_pat.search(key) is not None and (
+                        val_pat is None or val_pat.search(val) is not None):
+                    return True
         return False
 
     def set_visible_in_layout(self, window_idx, val):