Rewrite env system

+ Initializes the modeline segment on hack-local-variables-hook, which
  is triggered as late as possible in the major mode activation process,
  when file/dir-local variables have been processed. This allows users
  to exploit file/dir-local variables to modify the behavior of this
  mode-line segment.
+ Add doom-modeline-{before,after}-update-env-hook hooks. Useful for
  injecting environment detection for things like conda and virtualenv.
+ Add customizable executable variables for each language. e.g.
  doom-modeline-env-python-executable
+ Simplify language env definition into a macro.
+ Replaces the version string with "..." while we wait for a new one.
+ Add support for enh-ruby-mode.

doom-modeline-core.el

@@ -123,9 +123,6 @@ The icons may not be showed correctly in terminal and on Windows.")
   "Whether display environment version or not.")
 (define-obsolete-variable-alias 'doom-modeline-version 'doom-modeline-env-version "1.7.4")
 
-(defvar doom-modeline-python-executable "python"
-  "What executable of Python will be used (if nil nothing will be showed).")
-
 (defvar doom-modeline-mu4e t
   "Whether display mu4e notifications or not. Requires `mu4e-alert' package.")
 

doom-modeline-env.el

@@ -44,19 +44,33 @@ Example: '(\"--version\") ")
   "A function that returns version number from a programs --version (or similar) command.
 Example: 'doom-modeline-env--ruby")
 
+(defvar doom-modeline-load-string "..."
+  "What to dispaly as the version while a new one is being loaded.")
+
+(defvar doom-modeline-after-update-env-hook nil
+  "Hooks that run after the modeline version string is updated.")
+
+(defvar doom-modeline-before-update-env-hook nil
+  "Hooks that run before the modeline version string is updated.")
+
 (defun doom-modeline-update-env ()
   "Update environment info on mode-line."
   (when (and doom-modeline-env-version
              doom-modeline-env--command
-             (executable-find doom-modeline-env--command)
              doom-modeline-env--command-args
              doom-modeline-env--parser)
-    (let ((default-directory (doom-modeline-project-root)))
+    (let ((default-directory (doom-modeline-project-root))
-      (doom-modeline-env--get doom-modeline-env--command
+          (buffer (current-buffer)))
-                              doom-modeline-env--command-args
+      (run-hooks 'doom-modeline-before-update-env-hook)
-                              (lambda (prog-version)
+      (setq doom-modeline-env--version doom-modeline-load-string)
-                                (setq doom-modeline-env--version
+      (doom-modeline-env--get
-                                      (funcall doom-modeline-env--parser prog-version)))))))
+       doom-modeline-env--command
+       doom-modeline-env--command-args
+       (lambda (prog-version)
+         (with-current-buffer buffer
+           (setq doom-modeline-env--version
+                 (funcall doom-modeline-env--parser prog-version))
+           (run-hooks 'doom-modeline-after-update-env-hook)))))))
 
 (add-hook 'find-file-hook #'doom-modeline-update-env)
 (with-no-warnings
@@ -89,55 +103,62 @@ Example:
                           (ignore-errors
                             (funcall parser line))))))
 
-;;
+(cl-defmacro doom-modeline-def-env (name &key hooks command parser)
-;; Parser
+  "Defines a handler for updating & displaying a version string for a language.
-;;
 
-(defun doom-modeline-env--ruby (line)
+NAME is an unquoted symbol representing the handler's unique ID.
-  "Parse Ruby version from LINE."
+HOOKS is a list of hook symbols where this handler should be triggered.
-  (car (split-string
+COMMAND should be a function that returns a shell command and its arguments (as
-        (cadr
+  a list). It is run on HOOKS. It takes no arguments.
-         (split-string line))
+PARSER should be a function for parsing COMMAND's output line-by-line, to
-        "p")))
+  extract the version string."
-
+  (declare (indent defun))
-(defun doom-modeline-env--elixir (line)
+  (unless (and hooks command parser)
-  "Parse Elixir version from LINE."
+    (error "'%s' env is missing either :hooks, :command or :parser" name))
-  (cadr
+  (let ((parse-fn  (intern (format "doom-modeline-env--%s-parse" name)))
-   (split-string line)))
+        (action-fn (intern (format "doom-modeline-env--%s-args"  name)))
-
+        (setup-fn  (intern (format "doom-modeline-env-setup-%s"  name)))
-(defun doom-modeline-env--rustc (line)
+        (update-fn (intern (format "doom-modeline-env-update-%s" name)))
-  "Parse Rust version from LINE."
+        (enable-var  (intern (format "doom-modeline-env-enable-%s" name)))
-  (car
+        (command-var (intern (format "doom-modeline-env-%s-command" name)))
-   (split-string
+        (parser-var  (intern (format "doom-modeline-env-%s-parser-fn" name)))
-    (cadr
+        (exe-var     (intern (format "doom-modeline-env-%s-executable" name))))
-     (split-string line))
+    (macroexp-progn
-    "-")))
+     `((defvar ,enable-var t
-
+         (format "Whether to display the version string for %s buffers." ',name))
-(defun doom-modeline-env--go (line)
+       (defvar ,command-var ',action-fn
-  "Parse Go version from LINE."
+         (concat "A function that returns the shell command and arguments (as a list) to\n"
-  (cadr
+                 "produce a version string."))
-   (split-string
+       (defvar ,parser-var ',parse-fn
-    (cadr
+         (format "The function for parsing each line of `%s's output." ',command-var))
-     (cdr
+       (defvar ,exe-var nil
-      (split-string
+         (format (concat "What executable to use for the version indicator in %s buffers.\n\n"
-       line)))
+                         "If nil, the default binary for this language is used.")
-    "go")))
+                 ',name))
-
+       (defalias ',parse-fn ,parser
-(defun doom-modeline-env--perl (line)
+         (format "The line parser for %s buffers.\n\nUsed by `%s'."
-  "Parse Perl version from LINE."
+                 ',name ',update-fn))
-  (cadr
+       (defalias ',action-fn ,command
-   (split-string
+         (format "The command resolver for %s buffers.\n\nUsed by `%s'."
-    (car
+                 ',name ',update-fn))
-     (split-string
+       (defalias ',setup-fn
-      (cadr
+         (lambda ()
-       (split-string line "("))
+           (if enable-local-variables
-      ")"))
+               (add-hook 'hack-local-variables-hook #',update-fn nil t)
-    "v")))
+             (,update-fn)))
-
+         (format "Prepares the modeline to later display the %s version string."
-(defun doom-modeline-env--python (line)
+                 ',name))
-  "Parse Python version from LINE."
+       (defalias ',update-fn
-  (cadr
+         (lambda ()
-   (split-string line)))
+           (when ,enable-var
+             (when-let* ((command (funcall ,command-var)))
+               (setq doom-modeline-env--command (car command)
+                     doom-modeline-env--command-args (cdr command)
+                     doom-modeline-env--parser ,parser-var)
+               (doom-modeline-update-env))))
+         (format "Updates the %s version string in the modeline." ',name))
+       (dolist (hook ',(doom-enlist (eval hooks)))
+         (add-hook hook #',setup-fn))))))
 
 
 ;;
@@ -145,43 +166,74 @@ Example:
 ;; Versions, support Python, Ruby, Perl and Golang, etc.
 ;;
 
-(add-hook 'python-mode-hook
+;;;###autoload (autoload 'doom-modeline-env-setup-python "doom-modeline-env")
-          (lambda ()
+(doom-modeline-def-env python
-            (cond ((and (fboundp 'pipenv-project-p) (pipenv-project-p) (executable-find "pipenv"))
+  :hooks   'python-mode-hook
-                   (setq doom-modeline-env--parser 'doom-modeline-env--python)
+  :command (lambda () (cond ((and (fboundp 'pipenv-project-p)
-                   (setq doom-modeline-env--command "pipenv")
+                             (pipenv-project-p))
-                   (setq doom-modeline-env--command-args '("run" "python" "--version")))
+                        (list "pipenv" "run"
-                  ((and doom-modeline-python-executable
+                              (or doom-modeline-env-python-executable
-                        (executable-find doom-modeline-python-executable))
+                                  python-shell-interpreter
-                   (setq doom-modeline-env--parser 'doom-modeline-env--python)
+                                  "python")
-                   (setq doom-modeline-env--command doom-modeline-python-executable)
+                              "--version"))
-                   (setq doom-modeline-env--command-args '("--version"))))))
+                       ((list (or doom-modeline-env-python-executable
-(add-hook 'ruby-mode-hook
+                                  python-shell-interpreter
-          (lambda ()
+                                  "python")
-            (setq doom-modeline-env--command "ruby")
+                              "--version"))))
-            (setq doom-modeline-env--command-args '("--version"))
+  :parser  (lambda (line) (cadr (split-string line))))
-            (setq doom-modeline-env--parser 'doom-modeline-env--ruby)))
-(add-hook 'perl-mode-hook
-          (lambda ()
-            (setq doom-modeline-env--command "perl")
-            (setq doom-modeline-env--command-args '("--version"))
-            (setq doom-modeline-env--parser 'doom-modeline-env--perl)))
-(add-hook 'go-mode-hook
-          (lambda ()
-            (setq doom-modeline-env--command "go")
-            (setq doom-modeline-env--command-args '("version"))
-            (setq doom-modeline-env--parser 'doom-modeline-env--go)))
 
-(add-hook 'elixir-mode-hook
+;;;###autoload (autoload 'doom-modeline-env-setup-ruby "doom-modeline-env")
-          (lambda ()
+(doom-modeline-def-env ruby
-            (setq doom-modeline-env--command "iex")
+  :hooks   '(ruby-mode-hook enh-ruby-mode-hook)
-            (setq doom-modeline-env--command-args '("--version"))
+  :command (lambda () (list (or doom-modeline-env-ruby-executable "ruby") "--version"))
-            (setq doom-modeline-env--parser 'doom-modeline-env--elixir)))
+  :parser  (lambda (line)
-(add-hook 'rust-mode-hook
+             (car (split-string
-          (lambda ()
+                   (cadr
-            (setq doom-modeline-env--command "rustc")
+                    (split-string line))
-            (setq doom-modeline-env--command-args '("--version"))
+                   "p"))))
-            (setq doom-modeline-env--parser 'doom-modeline-env--rustc)))
+
+;;;###autoload (autoload 'doom-modeline-env-setup-perl "doom-modeline-env")
+(doom-modeline-def-env perl
+  :hooks   'perl-mode-hook
+  :command (lambda () (list (or doom-modeline-env-perl-executable "perl") "--version"))
+  :parser  (lambda (line)
+             (cadr
+              (split-string
+               (car
+                (split-string
+                 (cadr
+                  (split-string line "("))
+                 ")"))
+               "v"))))
+
+;;;###autoload (autoload 'doom-modeline-env-setup-go "doom-modeline-env")
+(doom-modeline-def-env go
+  :hooks   'go-mode-hook
+  :command (lambda () (list (or doom-modeline-env-go-executable "go") "version"))
+  :parser  (lambda (line)
+             (cadr
+              (split-string
+               (cadr
+                (cdr
+                 (split-string line)))
+               "go"))))
+
+;;;###autoload (autoload 'doom-modeline-env-setup-elixir "doom-modeline-env")
+(doom-modeline-def-env elixir
+  :hooks   'elixir-mode-hook
+  :command (lambda () (list (or doom-modeline-env-elixir-executable "iex") "--version"))
+  :parser  (lambda () (cadr (split-string line))))
+
+;;;###autoload (autoload 'doom-modeline-env-setup-rust "doom-modeline-env")
+(doom-modeline-def-env rust
+  :hooks   'rust-mode-hook
+  :command (lambda () (list (or doom-modeline-env-rust-executable "rustc") "--version"))
+  :parser  (lambda (line)
+             (car
+              (split-string
+               (cadr
+                (split-string line))
+               "-"))))
 
 (provide 'doom-modeline-env)