277 lines
11 KiB
EmacsLisp
277 lines
11 KiB
EmacsLisp
;;; doom-modeline-env.el --- A environment parser for doom-modeline -*- lexical-binding: t -*-
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;; Copyright (C) 2019-2020 Justin Barclay, Vincent Zhang
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;; This file is not part of GNU Emacs.
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;;
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;
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;;; Commentary:
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;;
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;; Parse programming environment.
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;;
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;;; Code:
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(require 'subr-x)
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(require 'doom-modeline-core)
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;; Externals
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(defvar python-shell-interpreter)
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;; Customization
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(defgroup doom-modeline-env nil
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"The environment parser for `doom-modeline'."
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:group 'doom-modeline
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:link '(url-link :tag "Homepage" "https://github.com/seagle0128/doom-modeline"))
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(defcustom doom-modeline-env-load-string doom-modeline-ellipsis
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"What to display as the version while a new one is being loaded."
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:type 'string
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:group 'doom-modeline-env)
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(defcustom doom-modeline-before-update-env-hook nil
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"Hooks that run before the modeline version string is updated."
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:type 'hook
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:group 'doom-modeline-env)
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(defcustom doom-modeline-after-update-env-hook nil
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"Hooks that run after the modeline version string is updated."
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:type 'hook
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:group 'doom-modeline-env)
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;; Variables
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;; Show version string for multi-version managers like rvm, rbenv, pyenv, etc.
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(defvar-local doom-modeline-env--version nil
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"The version to display with major-mode in mode-line.
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Example: \"2.6.0\"")
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(defvar-local doom-modeline-env--command nil
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"A program that we're looking to extract version information from.
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Example: \"ruby\"")
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(defvar-local doom-modeline-env--command-args nil
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"A list of arguments for the command to extract the version from.
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Example: \\='(\"--version\")")
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(defvar-local doom-modeline-env--parser nil
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"A function that returns version number from a command --version (or similar).
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Example: \\='doom-modeline-env--ruby")
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;; Functions & Macros
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(defun doom-modeline-update-env ()
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"Update environment info on mode-line."
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(when (and doom-modeline-env-version
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doom-modeline-env--command
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(executable-find doom-modeline-env--command)
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doom-modeline-env--command-args
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doom-modeline-env--parser)
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(let ((default-directory (doom-modeline-project-root))
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(buffer (current-buffer)))
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(run-hooks 'doom-modeline-before-update-env-hook)
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(setq doom-modeline-env--version doom-modeline-env-load-string)
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(doom-modeline-env--get
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doom-modeline-env--command
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doom-modeline-env--command-args
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(lambda (prog-version)
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(with-current-buffer buffer
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(setq doom-modeline-env--version
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(funcall doom-modeline-env--parser prog-version))
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(run-hooks 'doom-modeline-after-update-env-hook)))))))
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(add-hook 'find-file-hook #'doom-modeline-update-env)
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(with-no-warnings
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(if (boundp 'after-focus-change-function)
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(add-function
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:after after-focus-change-function
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(lambda ()
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(if (frame-focus-state)
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(doom-modeline-update-env))))
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(add-hook 'focus-in-hook #'doom-modeline-update-env)))
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(defun doom-modeline-env--get (prog args callback)
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"Start a sub process using PROG and apply the ARGS to the sub process.
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Once it receives information from STDOUT, it closes off the subprocess and
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passes on the information into the CALLBACK.
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Example:
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(doom-modeline-env--get
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\"ruby\"
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\\='(\"--version\")
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(lambda (line)
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(message (doom-modeline-parser--ruby line)))"
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(when-let ((proc (ignore-errors
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(apply 'start-process
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;; Flaten process-args into a single list so we can handle
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;; variadic length args
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(append
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(list "doom-modeline-env" nil prog)
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args))))
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(parser callback))
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(set-process-filter proc
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(lambda (_proc line)
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(ignore-errors
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(funcall parser line))))))
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(cl-defmacro doom-modeline-def-env (name &key hooks command parser)
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"Define a handler for updating & displaying a version string for a language.
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NAME is an unquoted symbol representing the handler's unique ID.
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HOOKS is a list of hook symbols where this handler should be triggered.
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COMMAND should be a function that returns a shell command and its arguments (as
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a list). It is run on HOOKS. It takes no arguments.
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PARSER should be a function for parsing COMMAND's output line-by-line, to
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extract the version string."
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(declare (indent defun))
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(unless (and hooks command parser)
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(error "'%s' env is missing either :hooks, :command or :parser" name))
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(let ((parse-fn (intern (format "doom-modeline-env--%s-parse" name)))
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(action-fn (intern (format "doom-modeline-env--%s-args" name)))
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(setup-fn (intern (format "doom-modeline-env-setup-%s" name)))
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(update-fn (intern (format "doom-modeline-env-update-%s" name)))
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(enable-var (intern (format "doom-modeline-env-enable-%s" name)))
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(command-var (intern (format "doom-modeline-env-%s-command" name)))
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(parser-var (intern (format "doom-modeline-env-%s-parser-fn" name)))
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(exe-var (intern (format "doom-modeline-env-%s-executable" name))))
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(macroexp-progn
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`((defcustom ,enable-var t
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,(format "Whether to display the version string for %s buffers." name)
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:type 'boolean
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:group 'doom-modeline-env)
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(defvar ,command-var ',action-fn
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,(concat "A function that returns the shell command and arguments (as a list) to\n"
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"produce a version string."))
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(defvar ,parser-var ',parse-fn
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,(format "The function to parse each line of `%s'\'s output." command-var))
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(defcustom ,exe-var nil
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,(format (concat "What executable to use for the version indicator in %s buffers.\n\n"
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"If nil, the default binary for this language is used.")
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name)
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:type 'string
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:group 'doom-modeline-env)
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(defalias ',parse-fn ,parser
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(format "The line parser for %s buffers.\n\nUsed by `%s'."
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',name ',update-fn))
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(defalias ',action-fn ,command
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(format "The command resolver for %s buffers.\n\nUsed by `%s'."
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',name ',update-fn))
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(defalias ',setup-fn
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(lambda ()
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(if enable-local-variables
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(add-hook 'hack-local-variables-hook #',update-fn nil t)
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(,update-fn)))
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(format "Prepares the modeline to later display the %s version string."
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',name))
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(defalias ',update-fn
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(lambda ()
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(when ,enable-var
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(when-let* ((command-list (funcall ,command-var))
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(exe (executable-find (car command-list))))
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(setq doom-modeline-env--command exe
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doom-modeline-env--command-args (cdr command-list)
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doom-modeline-env--parser ,parser-var)
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(doom-modeline-update-env))))
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(format "Updates the %s version string in the modeline." ',name))
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(let ((hooks ',(eval hooks)))
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(dolist (hook (if (listp hooks) hooks (list hooks)))
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(add-hook hook #',setup-fn)))))))
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;; Bootstrap
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;; Versions, support Python, Ruby, Perl and Golang, etc.
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;;;###autoload (autoload 'doom-modeline-env-setup-python "doom-modeline-env")
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(doom-modeline-def-env python
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:hooks 'python-mode-hook
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:command (lambda () (cond ((and (fboundp 'pipenv-project-p)
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(pipenv-project-p))
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(list "pipenv" "run"
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(or doom-modeline-env-python-executable
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python-shell-interpreter
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"python")
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"--version"))
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((executable-find "pyenv") (list "pyenv" "version-name"))
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((list (or doom-modeline-env-python-executable
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python-shell-interpreter
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"python")
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"--version"))))
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:parser (lambda (line) (let ((version (split-string line)))
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(if (length> version 1)
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(cadr version)
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(car version)))))
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;;;###autoload (autoload 'doom-modeline-env-setup-ruby "doom-modeline-env")
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(doom-modeline-def-env ruby
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:hooks '(ruby-mode-hook enh-ruby-mode-hook)
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:command (lambda () (list (or doom-modeline-env-ruby-executable "ruby") "--version"))
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:parser (lambda (line)
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(car (split-string
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(cadr
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(split-string line))
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"p"))))
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;;;###autoload (autoload 'doom-modeline-env-setup-perl "doom-modeline-env")
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(doom-modeline-def-env perl
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:hooks 'perl-mode-hook
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:command (lambda () (list (or doom-modeline-env-perl-executable "perl") "--version"))
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:parser (lambda (line)
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(cadr
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(split-string
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(car
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(split-string
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(cadr
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(split-string line "("))
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")"))
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"v"))))
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;;;###autoload (autoload 'doom-modeline-env-setup-go "doom-modeline-env")
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(doom-modeline-def-env go
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:hooks 'go-mode-hook
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:command (lambda () (list (or doom-modeline-env-go-executable "go") "version"))
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:parser (lambda (line)
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(cadr
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(split-string
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(cadr
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(cdr
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(split-string line)))
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"go"))))
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;;;###autoload (autoload 'doom-modeline-env-setup-elixir "doom-modeline-env")
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(doom-modeline-def-env elixir
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:hooks 'elixir-mode-hook
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:command (lambda () (list (or doom-modeline-env-elixir-executable "elixir") "--version"))
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:parser (lambda (line) (cadr (split-string line))))
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;;;###autoload (autoload 'doom-modeline-env-setup-rust "doom-modeline-env")
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(doom-modeline-def-env rust
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:hooks 'rust-mode-hook
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:command (lambda () (list (or doom-modeline-env-rust-executable "rustc") "--version"))
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:parser (lambda (line)
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(car
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(split-string
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(cadr
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(split-string line))
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"-"))))
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(provide 'doom-modeline-env)
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;;; doom-modeline-env.el ends here
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