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-rw-r--r--emacs/guix-utils.el83
1 files changed, 82 insertions, 1 deletions
diff --git a/emacs/guix-utils.el b/emacs/guix-utils.el
index 3c75417a08..4f5c69ca4d 100644
--- a/emacs/guix-utils.el
+++ b/emacs/guix-utils.el
@@ -232,6 +232,14 @@ Return time value."
(require 'org)
(org-read-date nil t nil prompt))
+(defun guix-read-file-name (prompt &optional dir default-filename
+ mustmatch initial predicate)
+ "Read file name.
+This function is similar to `read-file-name' except it also
+expands the file name."
+ (expand-file-name (read-file-name prompt dir default-filename
+ mustmatch initial predicate)))
+
(defcustom guix-find-file-function #'find-file
"Function used to find a file.
The function is called by `guix-find-file' with a file name as a
@@ -397,6 +405,77 @@ See `guix-alist-put' for details."
(diff old new (or switches guix-diff-switches) no-async))
+;;; Completing readers definers
+
+(defmacro guix-define-reader (name read-fun completions prompt)
+ "Define NAME function to read from minibuffer.
+READ-FUN may be `completing-read', `completing-read-multiple' or
+another function with the same arguments."
+ `(defun ,name (&optional prompt initial-contents)
+ (,read-fun ,(if prompt
+ `(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 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)
@@ -436,7 +515,9 @@ See `defun' for the meaning of arguments."
(defvar guix-utils-font-lock-keywords
(eval-when-compile
- `((,(rx "(" (group (or "guix-keyword-args-let"
+ `((,(rx "(" (group (or "guix-define-reader"
+ "guix-define-readers"
+ "guix-keyword-args-let"
"guix-with-indent"))
symbol-end)
. 1)