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emacs: Add support for modifying options during operation confirmation.

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* emacs/guix-base.el (guix-operation-option-key): New face.
  (guix-operation-option-true-string, guix-operation-option-false-string,
  guix-operation-option-separator, guix-operation-options): New variables.
  (guix-operation-option-by-key, guix-operation-option-key,
  guix-operation-option-name, guix-operation-option-variable,
  guix-operation-option-value, guix-operation-option-string-value,
  guix-operation-prompt, guix-operation-set-mode-line): New procedures.
  (guix-continue-package-operation-p): Use 'guix-operation-prompt'.
This commit is contained in:
Alex Kost 2014-10-02 22:31:18 +04:00
parent 2a9a4fb8b7
commit b497a85be8
1 changed files with 105 additions and 1 deletions
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106
emacs/guix-base.el
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@ -591,6 +591,11 @@ This function will not update the information, use
;;; Actions on packages and generations
(defface guix-operation-option-key
'((t :inherit font-lock-warning-face))
"Face used for the keys of operation options."
:group 'guix)
(defcustom guix-operation-confirm t
"If nil, do not prompt to confirm an operation."
:type 'boolean
@ -607,6 +612,54 @@ This function will not update the information, use
(defvar guix-temp-buffer-name " *Guix temp*"
"Name of a buffer used for displaying info before executing operation.")
(defvar guix-operation-option-true-string "yes"
"String displayed in the mode-line when operation option is t.")
(defvar guix-operation-option-false-string "no "
"String displayed in the mode-line when operation option is nil.")
(defvar guix-operation-option-separator " | "
"String used in the mode-line to separate operation options.")
(defvar guix-operation-options
'((?s "substitutes" guix-use-substitutes)
(?d "dry-run" guix-dry-run))
"List of available operation options.
Each element of the list has a form:
(KEY NAME VARIABLE)
KEY is a character that may be pressed during confirmation to
toggle the option.
NAME is a string displayed in the mode-line.
VARIABLE is a name of an option variable.")
(defun guix-operation-option-by-key (key)
"Return operation option by KEY (character)."
(assq key guix-operation-options))
(defun guix-operation-option-key (option)
"Return key (character) of the operation OPTION."
(car option))
(defun guix-operation-option-name (option)
"Return name of the operation OPTION."
(nth 1 option))
(defun guix-operation-option-variable (option)
"Return name of the variable of the operation OPTION."
(nth 2 option))
(defun guix-operation-option-value (option)
"Return boolean value of the operation OPTION."
(symbol-value (guix-operation-option-variable option)))
(defun guix-operation-option-string-value (option)
"Convert boolean value of the operation OPTION to string and return it."
(if (guix-operation-option-value option)
guix-operation-option-true-string
guix-operation-option-false-string))
(defun guix-process-package-actions (&rest actions)
"Process package ACTIONS.
Each action is a list of the form:
@ -663,7 +716,7 @@ See `guix-process-package-actions' for details."
'((display-buffer-reuse-window
display-buffer-at-bottom)
(window-height . fit-window-to-buffer)))))
(prog1 (y-or-n-p "Continue operation? ")
(prog1 (guix-operation-prompt)
(quit-window nil win)))))
(message "Nothing to be done. If the REPL was restarted, information is not up-to-date.")
nil))))
@ -697,6 +750,57 @@ ENTRIES is a list of package entries to get info about packages."
strings)
(insert "\n")))
(defun guix-operation-prompt ()
"Prompt a user for continuing the current package operation.
Return non-nil, if the operation should be continued; nil otherwise."
(let* ((option-keys (mapcar #'guix-operation-option-key
guix-operation-options))
(keys (append '(?y ?n) option-keys))
(prompt (concat (propertize "Continue operation?"
'face 'minibuffer-prompt)
" ("
(mapconcat
(lambda (key)
(propertize (string key)
'face 'guix-operation-option-key))
keys
", ")
") ")))
(prog1 (guix-operation-prompt-1 prompt keys)
;; Clear the minibuffer after prompting.
(message ""))))
(defun guix-operation-prompt-1 (prompt keys)
"This function is internal for `guix-operation-prompt'."
(guix-operation-set-mode-line)
(let ((key (read-char-choice prompt (cons ?\C-g keys) t)))
(cl-case key
(?y t)
((?n ?\C-g) nil)
(t (let* ((option (guix-operation-option-by-key key))
(var (guix-operation-option-variable option)))
(set var (not (symbol-value var)))
(guix-operation-prompt-1 prompt keys))))))
(defun guix-operation-set-mode-line ()
"Display operation options in the mode-line of the current buffer."
(setq mode-line-format
(concat (propertize " Options: "
'face 'mode-line-buffer-id)
(mapconcat
(lambda (option)
(let ((key (guix-operation-option-key option))
(name (guix-operation-option-name option))
(val (guix-operation-option-string-value option)))
(concat name
" ("
(propertize (string key)
'face 'guix-operation-option-key)
"): " val)))
guix-operation-options
guix-operation-option-separator)))
(force-mode-line-update))
(provide 'guix-base)
;;; guix-base.el ends here