92 lines
3.1 KiB
EmacsLisp
92 lines
3.1 KiB
EmacsLisp
;;; -*- lexical-binding: t -*-
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;;; ohai-lib.el --- Utility functions for use elsewhere.
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;; Copyright (C) 2015 Bodil Stokke
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;; Author: Bodil Stokke <bodil@bodil.org>
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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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;; 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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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(require 'ohai-package)
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;; Ensure the New Standard Library is installed and always available.
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;; f.el - files and paths https://github.com/rejeep/f.el
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;; s.el - strings https://github.com/magnars/s.el
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;; dash.el - lists https://github.com/magnars/dash.el
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(package-require 'f)
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(require 'f)
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(package-require 's)
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(require 's)
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(package-require 'dash)
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(require 'dash)
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(defun ohai/font-lock-replace-symbol (mode reg sym)
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"Given a major mode `mode', replace the regular expression `reg' with
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the symbol `sym' when rendering."
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(font-lock-add-keywords
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mode `((,reg
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(0 (progn (compose-region (match-beginning 1) (match-end 1)
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,sym 'decompose-region)))))))
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(defun ohai/exec (command)
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"Run a shell command and return its output as a string, whitespace trimmed."
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(s-trim (shell-command-to-string command)))
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(defun ohai/is-exec (command)
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"Returns true if `command' is an executable on the system search path."
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(f-executable? (s-trim (shell-command-to-string (s-concat "which " command)))))
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(defun ohai/resolve-exec (command)
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"If `command' is an executable on the system search path, return its absolute path.
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Otherwise, return nil."
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(-let [path (s-trim (shell-command-to-string (s-concat "which " command)))]
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(when (f-executable? path) path)))
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(defun ohai/exec-if-exec (command args)
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"If `command' satisfies `ohai/is-exec', run it with `args' and return its
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output as per `ohai/exec'. Otherwise, return nil."
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(when (ohai/is-exec command) (ohai/exec (s-concat command " " args))))
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(defun ohai/getent (user)
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"Get the /etc/passwd entry for the user `user' as a list of strings,
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or nil if there is no such user. Empty fields will be represented as nil,
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as opposed to empty strings."
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(-let [ent (ohai/exec (s-concat "getent passwd " user))]
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(when (not (s-blank? ent))
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(-map (lambda (i) (if (s-blank? i) nil i))
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(s-split ":" ent)))))
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(defun ohai/user-full-name ()
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"Guess the user's full name. Returns nil if no likely name could be found."
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(or (ohai/exec-if-exec "git" "config --get user.name")
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(elt (ohai/getent (getenv "USER")) 4)))
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(defun ohai/user-email ()
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"Guess the user's email address. Returns nil if none could be found."
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(or (ohai/exec-if-exec "git" "config --get user.email")
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(getenv "EMAIL")))
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(provide 'ohai-lib)
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;;; ohai-lib.el ends here
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