emacs: Reorganize 'readers' code.

* emacs/guix-base.el (guix-graph-type-names, guix-refresh-updater-names)
  (guix-lint-checker-names, guix-package-names): Move to...
* emacs/guix-read.el: ... here.
  (guix-read-file-name, guix-define-reader, guix-define-readers): Move to...
* emacs/guix-utils.el: ... here.

emacs/guix-base.el

@@ -108,35 +108,6 @@ For the meaning of location, see `guix-find-location'."
   (guix-eval-read (guix-make-guile-expression
                    'package-location-string id-or-name)))
 
-
-;;; Receivable lists of packages, lint checkers, etc.
-
-(guix-memoized-defun guix-graph-type-names ()
-  "Return a list of names of available graph node types."
-  (guix-eval-read (guix-make-guile-expression 'graph-type-names)))
-
-(guix-memoized-defun guix-refresh-updater-names ()
-  "Return a list of names of available refresh updater types."
-  (guix-eval-read (guix-make-guile-expression 'refresh-updater-names)))
-
-(guix-memoized-defun guix-lint-checker-names ()
-  "Return a list of names of available lint checkers."
-  (guix-eval-read (guix-make-guile-expression 'lint-checker-names)))
-
-(guix-memoized-defun guix-package-names ()
-  "Return a list of names of available packages."
-  (sort
-   ;; Work around <https://github.com/jaor/geiser/issues/64>:
-   ;; list of strings is parsed much slower than list of lists,
-   ;; so we use 'package-names-lists' instead of 'package-names'.
-
-   ;; (guix-eval-read (guix-make-guile-expression 'package-names))
-
-   (mapcar #'car
-           (guix-eval-read (guix-make-guile-expression
-                            'package-names-lists)))
-   #'string<))
-
 
 ;;; Getting and displaying info about packages and generations
 

emacs/guix-read.el

@@ -26,83 +26,40 @@
 
 (require 'guix-help-vars)
 (require 'guix-utils)
-(require 'guix-base)
+(require 'guix-backend)
+(require 'guix-guile)
 
-(defun guix-read-file-name (prompt &optional dir default-filename
+
-                                   mustmatch initial predicate)
+;;; Receivable lists of packages, lint checkers, etc.
-  "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)))
 
-(defmacro guix-define-reader (name read-fun completions prompt)
+(guix-memoized-defun guix-graph-type-names ()
-  "Define NAME function to read from minibuffer.
+  "Return a list of names of available graph node types."
-READ-FUN may be `completing-read', `completing-read-multiple' or
+  (guix-eval-read (guix-make-guile-expression 'graph-type-names)))
-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)
+(guix-memoized-defun guix-refresh-updater-names ()
-  "Define reader functions.
+  "Return a list of names of available refresh updater types."
+  (guix-eval-read (guix-make-guile-expression 'refresh-updater-names)))
 
-ARGS should have a form [KEYWORD VALUE] ...  The following
+(guix-memoized-defun guix-lint-checker-names ()
-keywords are available:
+  "Return a list of names of available lint checkers."
+  (guix-eval-read (guix-make-guile-expression 'lint-checker-names)))
 
-  - `completions-var' - variable used to get completions.
+(guix-memoized-defun guix-package-names ()
+  "Return a list of names of available packages."
+  (sort
+   ;; Work around <https://github.com/jaor/geiser/issues/64>:
+   ;; list of strings is parsed much slower than list of lists,
+   ;; so we use 'package-names-lists' instead of 'package-names'.
 
-  - `completions-getter' - function used to get completions.
+   ;; (guix-eval-read (guix-make-guile-expression 'package-names))
 
-  - `single-reader', `single-prompt' - name of a function to read
+   (mapcar #'car
-    a single value, and a prompt for it.
+           (guix-eval-read (guix-make-guile-expression
+                            'package-names-lists)))
+   #'string<))
 
-  - `multiple-reader', `multiple-prompt' - name of a function to
+
-    read multiple values, and a prompt for it.
+;;; Readers
-
-  - `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))))))))
 
 (guix-define-readers
  :completions-var guix-help-system-types

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
@@ -396,6 +404,77 @@ See `guix-alist-put' for details."
   "Same as `diff', but use `guix-diff-switches' as default."
   (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
 
@@ -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)