309 lines
10 KiB
EmacsLisp
309 lines
10 KiB
EmacsLisp
;;; guix-utils.el --- General utility functions -*- lexical-binding: t -*-
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;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>
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;; This file is part of GNU Guix.
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;; GNU Guix 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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;; GNU Guix 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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;;; Commentary:
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;; This file provides auxiliary general functions for guix.el package.
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;;; Code:
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(require 'cl-lib)
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(defvar guix-true-string "Yes")
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(defvar guix-false-string "–")
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(defvar guix-list-separator ", ")
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(defvar guix-time-format "%F %T"
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"String used to format time values.
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For possible formats, see `format-time-string'.")
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(defun guix-get-string (val &optional face)
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"Convert VAL into a string and return it.
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VAL can be an expression of any type.
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If VAL is t/nil, it is replaced with
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`guix-true-string'/`guix-false-string'.
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If VAL is list, its elements are concatenated using
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`guix-list-separator'.
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If FACE is non-nil, propertize returned string with this FACE."
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(let ((str (cond
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((stringp val) val)
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((null val) guix-false-string)
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((eq t val) guix-true-string)
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((numberp val) (number-to-string val))
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((listp val) (mapconcat #'guix-get-string
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val guix-list-separator))
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(t (prin1-to-string val)))))
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(if (and val face)
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(propertize str 'font-lock-face face)
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str)))
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(defun guix-get-time-string (seconds)
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"Return formatted time string from SECONDS.
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Use `guix-time-format'."
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(format-time-string guix-time-format (seconds-to-time seconds)))
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(defun guix-get-one-line (str)
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"Return one-line string from a multi-line STR."
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(replace-regexp-in-string "\n" " " str))
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(defun guix-format-insert (val &optional face format)
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"Convert VAL into a string and insert it at point.
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If FACE is non-nil, propertize VAL with FACE.
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If FORMAT is non-nil, format VAL with FORMAT."
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(let ((str (guix-get-string val face)))
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(insert (if format
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(format format str)
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str))))
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(defun guix-mapinsert (function sequence separator)
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"Like `mapconcat' but for inserting text.
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Apply FUNCTION to each element of SEQUENCE, and insert SEPARATOR
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at point between each FUNCTION call."
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(when sequence
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(funcall function (car sequence))
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(mapc (lambda (obj)
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(insert separator)
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(funcall function obj))
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(cdr sequence))))
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(defun guix-insert-button (label &optional type &rest properties)
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"Make button of TYPE with LABEL and insert it at point.
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See `insert-text-button' for the meaning of PROPERTIES."
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(if (null label)
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(guix-format-insert nil)
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(apply #'insert-text-button label
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:type (or type 'button)
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properties)))
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(defun guix-split-insert (val &optional face col separator)
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"Convert VAL into a string, split it and insert at point.
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If FACE is non-nil, propertize returned string with this FACE.
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If COL is non-nil and result string is a one-line string longer
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than COL, split it into several short lines.
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Separate inserted lines with SEPARATOR."
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(if (null val)
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(guix-format-insert nil)
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(let ((strings (guix-split-string (guix-get-string val) col)))
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(guix-mapinsert (lambda (str) (guix-format-insert str face))
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strings
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(or separator "")))))
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(defun guix-split-string (str &optional col)
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"Split string STR by lines and return list of result strings.
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If COL is non-nil and STR is a one-line string longer than COL,
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split it into several short lines."
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(let ((strings (split-string str "\n *")))
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(if (and col
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(null (cdr strings)) ; if not multi-line
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(> (length str) col))
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(split-string (guix-get-filled-string str col) "\n")
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strings)))
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(defun guix-get-filled-string (str col)
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"Return string by filling STR to column COL."
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(with-temp-buffer
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(insert str)
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(let ((fill-column col))
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(fill-region (point-min) (point-max)))
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(buffer-string)))
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(defun guix-concat-strings (strings separator &optional location)
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"Return new string by concatenating STRINGS with SEPARATOR.
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If LOCATION is a symbol `head', add another SEPARATOR to the
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beginning of the returned string; if `tail' - add SEPARATOR to
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the end of the string; if nil, do not add SEPARATOR; otherwise
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add both to the end and to the beginning."
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(let ((str (mapconcat #'identity strings separator)))
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(cond ((null location)
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str)
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((eq location 'head)
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(concat separator str))
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((eq location 'tail)
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(concat str separator))
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(t
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(concat separator str separator)))))
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(defun guix-shell-quote-argument (argument)
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"Quote shell command ARGUMENT.
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This function is similar to `shell-quote-argument', but less strict."
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(if (equal argument "")
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"''"
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(replace-regexp-in-string
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"\n" "'\n'"
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(replace-regexp-in-string
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(rx (not (any alnum "-=,./\n"))) "\\\\\\&" argument))))
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(defun guix-command-symbol (&optional args)
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"Return symbol by concatenating 'guix' and ARGS (strings)."
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(intern (guix-concat-strings (cons "guix" args) "-")))
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(defun guix-command-string (&optional args)
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"Return 'guix ARGS ...' string with quoted shell arguments."
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(let ((args (mapcar #'guix-shell-quote-argument args)))
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(guix-concat-strings (cons "guix" args) " ")))
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(defun guix-copy-as-kill (string &optional no-message?)
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"Put STRING into `kill-ring'.
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If NO-MESSAGE? is non-nil, do not display a message about it."
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(kill-new string)
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(unless no-message?
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(message "'%s' has been added to kill ring." string)))
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(defun guix-copy-command-as-kill (args &optional no-message?)
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"Put 'guix ARGS ...' string into `kill-ring'.
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See also `guix-copy-as-kill'."
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(guix-copy-as-kill (guix-command-string args) no-message?))
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(defun guix-completing-read-multiple (prompt table &optional predicate
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require-match initial-input
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hist def inherit-input-method)
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"Same as `completing-read-multiple' but remove duplicates in result."
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(cl-remove-duplicates
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(completing-read-multiple prompt table predicate
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require-match initial-input
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hist def inherit-input-method)
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:test #'string=))
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(declare-function org-read-date "org" t)
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(defun guix-read-date (prompt)
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"Prompt for a date or time using `org-read-date'.
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Return time value."
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(require 'org)
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(org-read-date nil t nil prompt))
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(defcustom guix-find-file-function #'find-file
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"Function used to find a file.
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The function is called by `guix-find-file' with a file name as a
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single argument."
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:type '(choice (function-item find-file)
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(function-item org-open-file)
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(function :tag "Other function"))
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:group 'guix)
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(defun guix-find-file (file)
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"Find FILE if it exists."
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(if (file-exists-p file)
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(funcall guix-find-file-function file)
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(message "File '%s' does not exist." file)))
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(defmacro guix-while-search (regexp &rest body)
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"Evaluate BODY after each search for REGEXP in the current buffer."
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(declare (indent 1) (debug t))
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`(save-excursion
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(goto-char (point-min))
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(while (re-search-forward ,regexp nil t)
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,@body)))
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(defun guix-any (pred lst)
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"Test whether any element from LST satisfies PRED.
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If so, return the return value from the successful PRED call.
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Return nil otherwise."
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(when lst
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(or (funcall pred (car lst))
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(guix-any pred (cdr lst)))))
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;;; Alist accessors
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(defmacro guix-define-alist-accessor (name assoc-fun)
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"Define NAME function to access alist values using ASSOC-FUN."
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`(defun ,name (alist &rest keys)
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,(format "Return value from ALIST by KEYS using `%s'.
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ALIST is alist of alists of alists ... which can be consecutively
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accessed with KEYS."
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assoc-fun)
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(if (or (null alist) (null keys))
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alist
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(apply #',name
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(cdr (,assoc-fun (car keys) alist))
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(cdr keys)))))
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(guix-define-alist-accessor guix-assq-value assq)
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(guix-define-alist-accessor guix-assoc-value assoc)
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;;; Diff
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(defvar guix-diff-switches "-u"
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"A string or list of strings specifying switches to be passed to diff.")
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(defun guix-diff (old new &optional switches no-async)
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"Same as `diff', but use `guix-diff-switches' as default."
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(diff old new (or switches guix-diff-switches) no-async))
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;;; Memoizing
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(defun guix-memoize (function)
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"Return a memoized version of FUNCTION."
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(let ((cache (make-hash-table :test 'equal)))
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(lambda (&rest args)
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(let ((result (gethash args cache 'not-found)))
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(if (eq result 'not-found)
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(let ((result (apply function args)))
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(puthash args result cache)
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result)
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result)))))
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(defmacro guix-memoized-defun (name arglist docstring &rest body)
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"Define a memoized function NAME.
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See `defun' for the meaning of arguments."
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(declare (doc-string 3) (indent 2))
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`(defalias ',name
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(guix-memoize (lambda ,arglist ,@body))
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;; Add '(name args ...)' string with real arglist to the docstring,
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;; because *Help* will display '(name &rest ARGS)' for a defined
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;; function (since `guix-memoize' returns a lambda with '(&rest
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;; args)').
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,(format "(%S %s)\n\n%s"
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name
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(mapconcat #'symbol-name arglist " ")
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docstring)))
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(defmacro guix-memoized-defalias (symbol definition &optional docstring)
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"Set SYMBOL's function definition to memoized version of DEFINITION."
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(declare (doc-string 3) (indent 1))
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`(defalias ',symbol
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(guix-memoize #',definition)
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,(or docstring
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(format "Memoized version of `%S'." definition))))
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(defvar guix-memoized-font-lock-keywords
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(eval-when-compile
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`((,(rx "("
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(group "guix-memoized-" (or "defun" "defalias"))
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symbol-end
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(zero-or-more blank)
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(zero-or-one
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(group (one-or-more (or (syntax word) (syntax symbol))))))
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(1 font-lock-keyword-face)
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(2 font-lock-function-name-face nil t)))))
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(font-lock-add-keywords 'emacs-lisp-mode guix-memoized-font-lock-keywords)
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(provide 'guix-utils)
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;;; guix-utils.el ends here
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