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609 lines
21 KiB
EmacsLisp
609 lines
21 KiB
EmacsLisp
;;; guix-utils.el --- General utility functions -*- lexical-binding: t -*-
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;; Copyright © 2014, 2015, 2016 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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(defmacro guix-with-indent (indent &rest body)
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"Evaluate BODY and indent inserted text by INDENT number of spaces."
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(declare (indent 1) (debug t))
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(let ((region-beg-var (make-symbol "region-beg"))
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(indent-var (make-symbol "indent")))
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`(let ((,region-beg-var (point))
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(,indent-var ,indent))
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,@body
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(unless (zerop ,indent-var)
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(indent-rigidly ,region-beg-var (point) ,indent-var)))))
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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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(cl-defun guix-mapinsert (function sequence separator &key indent column)
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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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If INDENT is non-nil, it should be a number of spaces used to
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indent each line of the inserted text.
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If COLUMN is non-nil, it should be a column number which
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shouldn't be exceeded by the inserted text."
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(pcase sequence
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(`(,first . ,rest)
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(let* ((indent (or indent 0))
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(max-column (and column (- column indent))))
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(guix-with-indent indent
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(funcall function first)
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(dolist (element rest)
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(let ((before-sep-pos (and column (point))))
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(insert separator)
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(let ((after-sep-pos (and column (point))))
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(funcall function element)
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(when (and column
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(> (current-column) max-column))
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(save-excursion
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(delete-region before-sep-pos after-sep-pos)
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(goto-char before-sep-pos)
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(insert "\n")))))))))))
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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-buttonize (value button-type separator &rest properties)
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"Make BUTTON-TYPE button(s) from VALUE.
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Return a string with button(s).
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VALUE should be a string or a list of strings. If it is a list
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of strings, buttons are separated with SEPARATOR string.
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PROPERTIES are passed to `guix-insert-button'."
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(with-temp-buffer
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(let ((labels (if (listp value) value (list value))))
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(guix-mapinsert (lambda (label)
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(apply #'guix-insert-button
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label button-type properties))
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labels
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separator))
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(buffer-substring (point-min) (point-max))))
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(defun guix-button-type? (symbol)
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"Return non-nil, if SYMBOL is a button type."
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(and symbol
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(get symbol 'button-category-symbol)))
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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, fill STR to this column."
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(let ((str (if col
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(guix-get-filled-string str col)
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str)))
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(split-string str "\n *" t)))
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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-hexify (value)
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"Convert VALUE to string and hexify it."
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(url-hexify-string (guix-get-string value)))
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(defun guix-number->bool (number)
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"Convert NUMBER to boolean value.
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Return nil, if NUMBER is 0; return t otherwise."
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(not (zerop number)))
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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-symbol-title (symbol)
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"Return SYMBOL's name, a string.
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This is like `symbol-name', but fancier."
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(if (eq symbol 'id)
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"ID"
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(let ((str (replace-regexp-in-string "-" " " (symbol-name symbol))))
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(concat (capitalize (substring str 0 1))
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(substring str 1)))))
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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-compose-buffer-name (base-name postfix)
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"Return buffer name by appending BASE-NAME and POSTFIX.
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In a simple case the result is:
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BASE-NAME: POSTFIX
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If BASE-NAME is wrapped by '*', then the result is:
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*BASE-NAME: POSTFIX*"
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(let ((re (rx string-start
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(group (? "*"))
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(group (*? any))
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(group (? "*"))
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string-end)))
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(or (string-match re base-name)
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(error "Unexpected error in defining buffer name"))
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(let ((first* (match-string 1 base-name))
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(name-body (match-string 2 base-name))
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(last* (match-string 3 base-name)))
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;; Handle the case when buffer name is wrapped by '*'.
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(if (and (string= "*" first*)
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(string= "*" last*))
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(concat "*" name-body ": " postfix "*")
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(concat base-name ": " postfix)))))
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(defun guix-completing-read (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' but return nil instead of an empty string."
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(let ((res (completing-read prompt table predicate
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require-match initial-input
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hist def inherit-input-method)))
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(unless (string= "" res) res)))
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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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(defun guix-read-file-name (prompt &optional dir default-filename
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mustmatch initial predicate)
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"Read file name.
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This function is similar to `read-file-name' except it also
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expands the file name."
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(expand-file-name (read-file-name prompt dir default-filename
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mustmatch initial predicate)))
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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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(defvar url-handler-regexp)
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(defun guix-find-file-or-url (file-or-url)
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"Find FILE-OR-URL."
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(require 'url-handlers)
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(let ((file-name-handler-alist
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(cons (cons url-handler-regexp 'url-file-handler)
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file-name-handler-alist)))
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(find-file file-or-url)))
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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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(defmacro guix-while-null (&rest body)
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"Evaluate BODY until its result becomes non-nil."
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(declare (indent 0) (debug t))
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(let ((result-var (make-symbol "result")))
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`(let (,result-var)
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(while (null ,result-var)
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(setq ,result-var ,@body))
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,result-var)))
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(defun guix-modify (object modifiers)
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"Apply MODIFIERS to OBJECT.
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OBJECT is passed as an argument to the first function from
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MODIFIERS list, the returned result is passed to the second
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function from the list and so on. Return result of the last
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modifier call."
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(if (null modifiers)
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object
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(guix-modify (funcall (car modifiers) object)
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(cdr modifiers))))
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(defmacro guix-keyword-args-let (args varlist &rest body)
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"Parse ARGS, bind variables from VARLIST and eval BODY.
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Find keyword values in ARGS, bind them to variables according to
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VARLIST, then evaluate BODY.
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ARGS is a keyword/value property list.
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Each element of VARLIST has a form:
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(SYMBOL KEYWORD [DEFAULT-VALUE])
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SYMBOL is a varible name. KEYWORD is a symbol that will be
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searched in ARGS for an according value. If the value of KEYWORD
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does not exist, bind SYMBOL to DEFAULT-VALUE or nil.
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The rest arguments (that present in ARGS but not in VARLIST) will
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be bound to `%foreign-args' variable.
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Example:
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(guix-keyword-args-let '(:two 8 :great ! :guix is)
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((one :one 1)
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(two :two 2)
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(foo :smth))
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(list one two foo %foreign-args))
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=> (1 8 nil (:guix is :great !))"
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(declare (indent 2))
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(let ((args-var (make-symbol "args")))
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`(let (,@(mapcar (lambda (spec)
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(pcase-let ((`(,name ,_ ,val) spec))
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(list name val)))
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varlist)
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(,args-var ,args)
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%foreign-args)
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(while ,args-var
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(pcase ,args-var
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(`(,key ,val . ,rest-args)
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(cl-case key
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,@(mapcar (lambda (spec)
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(pcase-let ((`(,name ,key ,_) spec))
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`(,key (setq ,name val))))
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varlist)
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(t (setq %foreign-args
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(cl-list* key val %foreign-args))))
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(setq ,args-var rest-args))))
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,@body)))
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;;; Alist procedures
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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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(defun guix-alist-put (value alist &rest keys)
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"Put (add or replace if exists) VALUE to ALIST using KEYS.
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Return the new alist.
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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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Example:
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(guix-alist-put
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'foo
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'((one (a . 1) (b . 2))
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(two (m . 7) (n . 8)))
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'one 'b)
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=> ((one (a . 1) (b . foo))
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(two (m . 7) (n . 8)))"
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(or keys (error "Keys should be specified"))
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(guix-alist-put-1 value alist keys))
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(defun guix-alist-put-1 (value alist keys)
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"Subroutine of `guix-alist-put'."
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(cond
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((null keys)
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value)
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((null alist)
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(list (cons (car keys)
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(guix-alist-put-1 value nil (cdr keys)))))
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((eq (car keys) (caar alist))
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(cons (cons (car keys)
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(guix-alist-put-1 value (cdar alist) (cdr keys)))
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(cdr alist)))
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(t
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(cons (car alist)
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(guix-alist-put-1 value (cdr alist) keys)))))
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(defun guix-alist-put! (value variable &rest keys)
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"Modify alist VARIABLE (symbol) by putting VALUE using KEYS.
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See `guix-alist-put' for details."
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(set variable
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(apply #'guix-alist-put value (symbol-value variable) keys)))
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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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;;; Completing readers definers
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(defmacro guix-define-reader (name read-fun completions prompt)
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"Define NAME function to read from minibuffer.
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READ-FUN may be `completing-read', `completing-read-multiple' or
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another function with the same arguments."
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`(defun ,name (&optional prompt initial-contents)
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(,read-fun ,(if prompt
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`(or prompt ,prompt)
|
||
'prompt)
|
||
,completions nil nil initial-contents)))
|
||
|
||
(defmacro guix-define-readers (&rest args)
|
||
"Define reader functions.
|
||
|
||
ARGS should have a form [KEYWORD VALUE] ... The following
|
||
keywords are available:
|
||
|
||
- `completions-var' - variable used to get completions.
|
||
|
||
- `completions-getter' - function used to get completions.
|
||
|
||
- `single-reader', `single-prompt' - name of a function to read
|
||
a single value, and a prompt for it.
|
||
|
||
- `multiple-reader', `multiple-prompt' - name of a function to
|
||
read multiple values, and a prompt for it.
|
||
|
||
- `multiple-separator' - if specified, another
|
||
`<multiple-reader-name>-string' function returning a string
|
||
of multiple values separated the specified separator will be
|
||
defined."
|
||
(guix-keyword-args-let args
|
||
((completions-var :completions-var)
|
||
(completions-getter :completions-getter)
|
||
(single-reader :single-reader)
|
||
(single-prompt :single-prompt)
|
||
(multiple-reader :multiple-reader)
|
||
(multiple-prompt :multiple-prompt)
|
||
(multiple-separator :multiple-separator))
|
||
(let ((completions
|
||
(cond ((and completions-var completions-getter)
|
||
`(or ,completions-var
|
||
(setq ,completions-var
|
||
(funcall ',completions-getter))))
|
||
(completions-var
|
||
completions-var)
|
||
(completions-getter
|
||
`(funcall ',completions-getter)))))
|
||
`(progn
|
||
,(when (and completions-var
|
||
(not (boundp completions-var)))
|
||
`(defvar ,completions-var nil))
|
||
|
||
,(when single-reader
|
||
`(guix-define-reader ,single-reader guix-completing-read
|
||
,completions ,single-prompt))
|
||
|
||
,(when multiple-reader
|
||
`(guix-define-reader ,multiple-reader completing-read-multiple
|
||
,completions ,multiple-prompt))
|
||
|
||
,(when (and multiple-reader multiple-separator)
|
||
(let ((name (intern (concat (symbol-name multiple-reader)
|
||
"-string"))))
|
||
`(defun ,name (&optional prompt initial-contents)
|
||
(guix-concat-strings
|
||
(,multiple-reader prompt initial-contents)
|
||
,multiple-separator))))))))
|
||
|
||
|
||
;;; Memoizing
|
||
|
||
(defun guix-memoize (function)
|
||
"Return a memoized version of FUNCTION."
|
||
(let ((cache (make-hash-table :test 'equal)))
|
||
(lambda (&rest args)
|
||
(let ((result (gethash args cache 'not-found)))
|
||
(if (eq result 'not-found)
|
||
(let ((result (apply function args)))
|
||
(puthash args result cache)
|
||
result)
|
||
result)))))
|
||
|
||
(defmacro guix-memoized-defun (name arglist docstring &rest body)
|
||
"Define a memoized function NAME.
|
||
See `defun' for the meaning of arguments."
|
||
(declare (doc-string 3) (indent 2))
|
||
`(defalias ',name
|
||
(guix-memoize (lambda ,arglist ,@body))
|
||
;; Add '(name args ...)' string with real arglist to the docstring,
|
||
;; because *Help* will display '(name &rest ARGS)' for a defined
|
||
;; function (since `guix-memoize' returns a lambda with '(&rest
|
||
;; args)').
|
||
,(format "(%S %s)\n\n%s"
|
||
name
|
||
(mapconcat #'symbol-name arglist " ")
|
||
docstring)))
|
||
|
||
(defmacro guix-memoized-defalias (symbol definition &optional docstring)
|
||
"Set SYMBOL's function definition to memoized version of DEFINITION."
|
||
(declare (doc-string 3) (indent 1))
|
||
`(defalias ',symbol
|
||
(guix-memoize #',definition)
|
||
,(or docstring
|
||
(format "Memoized version of `%S'." definition))))
|
||
|
||
|
||
(defvar guix-utils-font-lock-keywords
|
||
(eval-when-compile
|
||
`((,(rx "(" (group (or "guix-define-reader"
|
||
"guix-define-readers"
|
||
"guix-keyword-args-let"
|
||
"guix-while-null"
|
||
"guix-while-search"
|
||
"guix-with-indent"))
|
||
symbol-end)
|
||
. 1)
|
||
(,(rx "("
|
||
(group "guix-memoized-" (or "defun" "defalias"))
|
||
symbol-end
|
||
(zero-or-more blank)
|
||
(zero-or-one
|
||
(group (one-or-more (or (syntax word) (syntax symbol))))))
|
||
(1 font-lock-keyword-face)
|
||
(2 font-lock-function-name-face nil t)))))
|
||
|
||
(font-lock-add-keywords 'emacs-lisp-mode guix-utils-font-lock-keywords)
|
||
|
||
(provide 'guix-utils)
|
||
|
||
;;; guix-utils.el ends here
|