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tinmop/modules/rewrite-message-urls.lisp

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Common Lisp
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;; tinmop module for rewrite link URLs before opening
;; Copyright © 2020 cage
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :modules)
(defparameter *rewriting-link-rules* '()
"Before displaying messages that module will rewrites the first
element of each item of this list with the second
Example
(\"foo\" \"bar\")
^^^
first
^^^
second
will replace 'foo' with 'bar'.
So the whole list is like: '((\"foo\" \"bar\") (\"old\" \"new\") ...)")
(defun rewriting-link-add-rule (from to)
(push (list from to)
*rewriting-link-rules*))
(defun rewriting-link-messages-links-rules (old-links)
(let ((results ()))
(loop for old-link in old-links do
(loop named inner
for rule in *rewriting-link-rules*
do
(let ((rewritten-link (cl-ppcre:regex-replace (first rule)
old-link
(second rule))))
(when (string/= rewritten-link old-link)
(push (cons old-link rewritten-link)
results)
(return-from inner t)))))
results))
(defun rewriting-link-replace-mapping (mapping text)
(cl-ppcre:regex-replace-all (cl-ppcre:quote-meta-chars (car mapping))
text
(cdr mapping)))
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(defun rewriting-link-skipped-row-p (row)
(let* ((original-type (message-window:row-get-original-object row))
(skipped-row-types (list 'gemini-parser:pre-line
'gemini-parser:pre-start
'gemini-parser:pre-end
'gemini-parser:vertical-space)))
(or (message-window:row-invisible-p row)
(find-if (lambda (a) (typep original-type a)) skipped-row-types))))
(defun rewriting-link-rewrite-row (window index links-mapping)
(with-accessors ((rows line-oriented-window:rows)) window
(when rows
(let* ((row (elt rows index))
(original-string (line-oriented-window:normal-text row)))
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(when (not (rewriting-link-skipped-row-p row))
(let* ((simple-string (tui:tui-string->chars-string original-string))
(replaced-string simple-string))
(loop for mapping in links-mapping do
(setf replaced-string
(rewriting-link-replace-mapping mapping replaced-string)))
(setf (line-oriented-window:normal-text row)
(tui:apply-coloring original-string replaced-string))
(setf (elt rows index)
(message-window:text->rendered-lines-rows window row))))))))
(defun rewriting-link-message-hook-fn (message-window)
(multiple-value-bind (x start-visible-index end-visible-index)
(message-window:visible-rows message-window)
(declare (ignore x))
(loop for i from start-visible-index below end-visible-index do
(rewriting-link-rewrite-row message-window i *rewriting-link-rules*))
message-window))
(defun rewriting-link-links-window-hook-fn (all-links)
(let ((links-mapping (rewriting-link-messages-links-rules all-links))
(results ()))
(loop for link in all-links do
(let* ((mapping (find-if (lambda (a) (string= link (car a))) links-mapping))
(mapped (if mapping
(rewriting-link-replace-mapping mapping link)
link)))
(push mapped results)))
(reverse results)))
(hooks:add-hook 'hooks:*before-rendering-message-text*
#'rewriting-link-message-hook-fn)
(hooks:add-hook 'hooks:*before-displaying-links-hook*
#'rewriting-link-links-window-hook-fn)