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Diffstat (limited to 'gnu/installer/newt/page.scm')
| -rw-r--r-- | gnu/installer/newt/page.scm | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/gnu/installer/newt/page.scm b/gnu/installer/newt/page.scm new file mode 100644 index 0000000000..bcede3e333 --- /dev/null +++ b/gnu/installer/newt/page.scm @@ -0,0 +1,313 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com> +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. + +(define-module (gnu installer newt page) + #:use-module (gnu installer newt utils) + #:use-module (guix i18n) + #:use-module (ice-9 match) + #:use-module (ice-9 receive) + #:use-module (newt) + #:export (draw-info-page + draw-connecting-page + run-input-page + run-error-page + run-listbox-selection-page + run-scale-page)) + +;;; Commentary: +;;; +;;; Some helpers around guile-newt to draw or run generic pages. The +;;; difference between 'draw' and 'run' terms comes from newt library. A page +;;; is drawn when the form it contains does not expect any user +;;; interaction. In that case, it is necessary to call (newt-refresh) to force +;;; the page to be displayed. When a form is 'run', it is blocked waiting for +;;; any action from the user (press a button, input some text, ...). +;;; +;;; Code: + +(define (draw-info-page text title) + "Draw an informative page with the given TEXT as content. Set the title of +this page to TITLE." + (let* ((text-box + (make-reflowed-textbox -1 -1 text 40 + #:flags FLAG-BORDER)) + (grid (make-grid 1 1)) + (form (make-form))) + (set-grid-field grid 0 0 GRID-ELEMENT-COMPONENT text-box) + (add-component-to-form form text-box) + (make-wrapped-grid-window grid title) + (draw-form form) + ;; This call is imperative, otherwise the form won't be displayed. See the + ;; explanation in the above commentary. + (newt-refresh) + form)) + +(define (draw-connecting-page service-name) + "Draw a page to indicate a connection in in progress." + (draw-info-page + (format #f (G_ "Connecting to ~a, please wait.") service-name) + (G_ "Connection in progress"))) + +(define* (run-input-page text title + #:key + (allow-empty-input? #f) + (input-field-width 40)) + "Run a page to prompt user for an input. The given TEXT will be displayed +above the input field. The page title is set to TITLE. Unless +allow-empty-input? is set to #t, an error page will be displayed if the user +enters an empty input." + (let* ((text-box + (make-reflowed-textbox -1 -1 text + input-field-width + #:flags FLAG-BORDER)) + (grid (make-grid 1 3)) + (input-entry (make-entry -1 -1 20)) + (ok-button (make-button -1 -1 (G_ "Ok"))) + (form (make-form))) + + (set-grid-field grid 0 0 GRID-ELEMENT-COMPONENT text-box) + (set-grid-field grid 0 1 GRID-ELEMENT-COMPONENT input-entry + #:pad-top 1) + (set-grid-field grid 0 2 GRID-ELEMENT-COMPONENT ok-button + #:pad-top 1) + + (add-components-to-form form text-box input-entry ok-button) + (make-wrapped-grid-window grid title) + (let ((error-page (lambda () + (run-error-page (G_ "Please enter a non empty input") + (G_ "Empty input"))))) + (let loop () + (receive (exit-reason argument) + (run-form form) + (let ((input (entry-value input-entry))) + (if (and (not allow-empty-input?) + (eq? exit-reason 'exit-component) + (string=? input "")) + (begin + ;; Display the error page. + (error-page) + ;; Set the focus back to the input input field. + (set-current-component form input-entry) + (loop)) + (begin + (destroy-form-and-pop form) + input)))))))) + +(define (run-error-page text title) + "Run a page to inform the user of an error. The page contains the given TEXT +to explain the error and an \"OK\" button to acknowledge the error. The title +of the page is set to TITLE." + (let* ((text-box + (make-reflowed-textbox -1 -1 text 40 + #:flags FLAG-BORDER)) + (grid (make-grid 1 2)) + (ok-button (make-button -1 -1 "Ok")) + (form (make-form))) + + (set-grid-field grid 0 0 GRID-ELEMENT-COMPONENT text-box) + (set-grid-field grid 0 1 GRID-ELEMENT-COMPONENT ok-button + #:pad-top 1) + + ;; Set the background color to red to indicate something went wrong. + (newt-set-color COLORSET-ROOT "white" "red") + (add-components-to-form form text-box ok-button) + (make-wrapped-grid-window grid title) + (run-form form) + ;; Restore the background to its original color. + (newt-set-color COLORSET-ROOT "white" "blue") + (destroy-form-and-pop form))) + +(define* (run-listbox-selection-page #:key + info-text + title + (info-textbox-width 50) + listbox-items + listbox-item->text + (listbox-height 20) + (listbox-default-item #f) + (listbox-allow-multiple? #f) + (sort-listbox-items? #t) + button-text + (button-callback-procedure + (const #t)) + (listbox-callback-procedure + (const #t))) + "Run a page asking the user to select an item in a listbox. The page +contains, stacked vertically from the top to the bottom, an informative text +set to INFO-TEXT, a listbox and a button. The listbox will be filled with +LISTBOX-ITEMS converted to text by applying the procedure LISTBOX-ITEM->TEXT +on every item. The selected item from LISTBOX-ITEMS is returned. The button +text is set to BUTTON-TEXT and the procedure BUTTON-CALLBACK-PROCEDURE called +when it is pressed. The procedure LISTBOX-CALLBACK-PROCEDURE is called when an +item from the listbox is selected (by pressing the <ENTER> key). + +INFO-TEXTBOX-WIDTH is the width of the textbox where INFO-TEXT will be +displayed. LISTBOX-HEIGHT is the height of the listbox. + +If LISTBOX-DEFAULT-ITEM is set to the value of one of the items in +LISTBOX-ITEMS, it will be selected by default. Otherwise, the first element of +the listbox is selected. + +If LISTBOX-ALLOW-MULTIPLE? is set to #t, multiple items from the listbox can +be selected (using the <SPACE> key). It that case, a list containing the +selected items will be returned. + +If SORT-LISTBOX-ITEMS? is set to #t, the listbox items are sorted using +'string<=' procedure (after being converted to text)." + + (define (fill-listbox listbox items) + "Append the given ITEMS to LISTBOX, once they have been converted to text +with LISTBOX-ITEM->TEXT. Each item appended to the LISTBOX is given a key by +newt. Save this key by returning an association list under the form: + + ((NEWT-LISTBOX-KEY . ITEM) ...) + +where NEWT-LISTBOX-KEY is the key returned by APPEND-ENTRY-TO-LISTBOX, when +ITEM was inserted into LISTBOX." + (map (lambda (item) + (let* ((text (listbox-item->text item)) + (key (append-entry-to-listbox listbox text))) + (cons key item))) + items)) + + (define (sort-listbox-items listbox-items) + "Return LISTBOX-ITEMS sorted using the 'string<=' procedure on the text +corresponding to each item in the list." + (let* ((items (map (lambda (item) + (cons item (listbox-item->text item))) + listbox-items)) + (sorted-items + (sort items (lambda (a b) + (let ((text-a (cdr a)) + (text-b (cdr b))) + (string<= text-a text-b)))))) + (map car sorted-items))) + + (define (set-default-item listbox listbox-keys default-item) + "Set the default item of LISTBOX to DEFAULT-ITEM. LISTBOX-KEYS is the +association list returned by the FILL-LISTBOX procedure. It is used because +the current listbox item has to be selected by key." + (for-each (match-lambda + ((key . item) + (when (equal? item default-item) + (set-current-listbox-entry-by-key listbox key)))) + listbox-keys)) + + (let* ((listbox (make-listbox + -1 -1 + listbox-height + (logior FLAG-SCROLL FLAG-BORDER FLAG-RETURNEXIT + (if listbox-allow-multiple? + FLAG-MULTIPLE + 0)))) + (form (make-form)) + (info-textbox + (make-reflowed-textbox -1 -1 info-text + info-textbox-width + #:flags FLAG-BORDER)) + (button (make-button -1 -1 button-text)) + (grid (vertically-stacked-grid + GRID-ELEMENT-COMPONENT info-textbox + GRID-ELEMENT-COMPONENT listbox + GRID-ELEMENT-COMPONENT button)) + (sorted-items (if sort-listbox-items? + (sort-listbox-items listbox-items) + listbox-items)) + (keys (fill-listbox listbox sorted-items))) + + (when listbox-default-item + (set-default-item listbox keys listbox-default-item)) + + (add-form-to-grid grid form #t) + (make-wrapped-grid-window grid title) + + (receive (exit-reason argument) + (run-form form) + (dynamic-wind + (const #t) + (lambda () + (when (eq? exit-reason 'exit-component) + (cond + ((components=? argument button) + (button-callback-procedure)) + ((components=? argument listbox) + (if listbox-allow-multiple? + (let* ((entries (listbox-selection listbox)) + (items (map (lambda (entry) + (assoc-ref keys entry)) + entries))) + (listbox-callback-procedure items) + items) + (let* ((entry (current-listbox-entry listbox)) + (item (assoc-ref keys entry))) + (listbox-callback-procedure item) + item)))))) + (lambda () + (destroy-form-and-pop form)))))) + +(define* (run-scale-page #:key + title + info-text + (info-textbox-width 50) + (scale-width 40) + (scale-full-value 100) + scale-update-proc + (max-scale-update 5)) + "Run a page with a progress bar (called 'scale' in newt). The given +INFO-TEXT is displayed in a textbox above the scale. The width of the textbox +is set to INFO-TEXTBOX-WIDTH. The width of the scale is set to +SCALE-WIDTH. SCALE-FULL-VALUE indicates the value that correspond to 100% of +the scale. + +The procedure SCALE-UPDATE-PROC shall return a new scale +value. SCALE-UPDATE-PROC will be called until the returned value is superior +or equal to SCALE-FULL-VALUE, but no more than MAX-SCALE-UPDATE times. An +error is raised if the MAX-SCALE-UPDATE limit is reached." + (let* ((info-textbox + (make-reflowed-textbox -1 -1 info-text + info-textbox-width + #:flags FLAG-BORDER)) + (scale (make-scale -1 -1 scale-width scale-full-value)) + (grid (vertically-stacked-grid + GRID-ELEMENT-COMPONENT info-textbox + GRID-ELEMENT-COMPONENT scale)) + (form (make-form))) + + (add-form-to-grid grid form #t) + (make-wrapped-grid-window grid title) + + (draw-form form) + ;; This call is imperative, otherwise the form won't be displayed. See the + ;; explanation in the above commentary. + (newt-refresh) + + (dynamic-wind + (const #t) + (lambda () + (let loop ((i max-scale-update) + (last-value 0)) + (let ((value (scale-update-proc last-value))) + (set-scale-value scale value) + ;; Same as above. + (newt-refresh) + (unless (>= value scale-full-value) + (if (> i 0) + (loop (- i 1) value) + (error "Max scale updates reached.")))))) + (lambda () + (destroy-form-and-pop form))))) |