Clickable URL links

bouquin/editor.py

@@ -1,23 +1,147 @@
 from __future__ import annotations
 
 from PySide6.QtGui import (
+    QBrush,
     QColor,
+    QDesktopServices,
     QFont,
     QFontDatabase,
     QTextCharFormat,
+    QTextCursor,
     QTextListFormat,
     QTextBlockFormat,
 )
-from PySide6.QtCore import Slot
+from PySide6.QtCore import Qt, QUrl, Signal, Slot, QRegularExpression
 from PySide6.QtWidgets import QTextEdit
 
+from .url_highlighter import UrlHighlighter
 
 class Editor(QTextEdit):
-    def __init__(self):
-        super().__init__()
+    linkActivated = Signal(str)
+
+    _URL_RX = QRegularExpression(r"(https?://[^\s<>\"]+|www\.[^\s<>\"]+)")
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
         tab_w = 4 * self.fontMetrics().horizontalAdvance(" ")
         self.setTabStopDistance(tab_w)
 
+        self.setTextInteractionFlags(
+            Qt.TextInteractionFlag.TextEditorInteraction
+            | Qt.TextInteractionFlag.LinksAccessibleByMouse
+            | Qt.TextInteractionFlag.LinksAccessibleByKeyboard
+        )
+
+        self.setAcceptRichText(True)
+
+        # Turn raw URLs into anchors
+        self._linkifying = False
+        self.textChanged.connect(self._linkify_document)
+        self.viewport().setMouseTracking(True)
+
+    def _linkify_document(self):
+        if self._linkifying:
+            return
+        self._linkifying = True
+
+        doc = self.document()
+        cur = QTextCursor(doc)
+        cur.beginEditBlock()
+
+        block = doc.begin()
+        while block.isValid():
+            text = block.text()
+            it = self._URL_RX.globalMatch(text)
+            while it.hasNext():
+                m = it.next()
+                start = block.position() + m.capturedStart()
+                end   = start + m.capturedLength()
+
+                cur.setPosition(start)
+                cur.setPosition(end, QTextCursor.KeepAnchor)
+
+                fmt = cur.charFormat()
+                if fmt.isAnchor():   # already linkified; skip
+                    continue
+
+                href = m.captured(0)
+                if href.startswith("www."):
+                    href = "https://" + href
+
+                fmt.setAnchor(True)
+                # Qt 6: use setAnchorHref; for compatibility, also set names.
+                try:
+                    fmt.setAnchorHref(href)
+                except AttributeError:
+                    fmt.setAnchorNames([href])
+
+                fmt.setFontUnderline(True)
+                fmt.setForeground(Qt.blue)
+                cur.setCharFormat(fmt)
+
+            block = block.next()
+
+        cur.endEditBlock()
+        self._linkifying = False
+
+    def mouseReleaseEvent(self, e):
+        if e.button() == Qt.LeftButton and (e.modifiers() & Qt.ControlModifier):
+            href = self.anchorAt(e.pos())
+            if href:
+                QDesktopServices.openUrl(QUrl.fromUserInput(href))
+                self.linkActivated.emit(href)
+                return
+        super().mouseReleaseEvent(e)
+
+    def mouseMoveEvent(self, e):
+        if (e.modifiers() & Qt.ControlModifier) and self.anchorAt(e.pos()):
+            self.viewport().setCursor(Qt.PointingHandCursor)
+        else:
+            self.viewport().setCursor(Qt.IBeamCursor)
+        super().mouseMoveEvent(e)
+
+    def keyPressEvent(self, e):
+        key = e.key()
+
+        # Pre-insert: stop link/format bleed for “word boundary” keys
+        if key in (Qt.Key_Space, Qt.Key_Tab):
+            self._break_anchor_for_next_char()
+            return super().keyPressEvent(e)
+
+        # When pressing Enter/return key, insert first, then neutralise the empty block’s inline format
+        if key in (Qt.Key_Return, Qt.Key_Enter):
+            super().keyPressEvent(e) # create the new (possibly empty) paragraph
+
+            # If we're on an empty block, clear the insertion char format so the
+            # *next* Enter will create another new line (not consume the press to reset formatting).
+            c = self.textCursor()
+            block = c.block()
+            if block.length() == 1:
+                self._clear_insertion_char_format()
+            return
+
+        return super().keyPressEvent(e)
+
+    def _clear_insertion_char_format(self):
+        """Reset inline typing format (keeps lists, alignment, margins, etc.)."""
+        nf = QTextCharFormat()
+        self.setCurrentCharFormat(nf)
+
+    def _break_anchor_for_next_char(self):
+        c = self.textCursor()
+        fmt = c.charFormat()
+        if fmt.isAnchor() or fmt.fontUnderline() or fmt.foreground().style() != 0:
+            # clone, then strip just the link-specific bits so the next char is plain text
+            nf = QTextCharFormat(fmt)
+            nf.setAnchor(False)
+            nf.setFontUnderline(False)
+            nf.clearForeground()
+            try:
+                nf.setAnchorHref("")
+            except AttributeError:
+                nf.setAnchorNames([])
+            self.setCurrentCharFormat(nf)
+
     def merge_on_sel(self, fmt):
         """
         Sets the styling on the selected characters.

bouquin/toolbar.py

@@ -19,6 +19,7 @@ class ToolBar(QToolBar):
     def __init__(self, parent=None):
         super().__init__("Format", parent)
         self._build_actions()
+        self.setObjectName("Format")
 
     def _build_actions(self):
         # Bold

bouquin/url_highlighter.py

@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+import re
+from PySide6.QtGui import QSyntaxHighlighter, QTextCharFormat
+from PySide6.QtCore import Qt, QRegularExpression
+
+class UrlHighlighter(QSyntaxHighlighter):
+    def __init__(self, doc):
+        super().__init__(doc)
+        self.rx = QRegularExpression(r"(https?://[^\s<>\"]+|www\.[^\s<>\"]+)")
+
+    def highlightBlock(self, text: str):
+        it = self.rx.globalMatch(text)
+        while it.hasNext():
+            m = it.next()
+            href = m.captured(0)
+            if href.startswith("www."):
+                href = "https://" + href
+
+            fmt = QTextCharFormat()
+            fmt.setAnchor(True)
+            fmt.setAnchorHref(href)
+            fmt.setFontUnderline(True)
+            fmt.setForeground(Qt.blue)
+            self.setFormat(m.capturedStart(0), m.capturedLength(0), fmt)