From d39c25b413e8a3380bb6566dd0bfb672be848050 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 6 Aug 2014 21:20:03 +0530
Subject: [PATCH] Edit Book: Allow changing the case of selected text by right
 clicking and choosing the appropriate change case action. Fixes #1353263
 [[Enhancement] - add Change Case functionality to Edit
 Book](https://bugs.launchpad.net/calibre/+bug/1353263)

---
 src/calibre/gui2/tweak_book/editor/text.py   | 10 +++++++++-
 src/calibre/gui2/tweak_book/editor/widget.py |  8 ++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/tweak_book/editor/text.py b/src/calibre/gui2/tweak_book/editor/text.py
index a6812cdb78..44094260a8 100644
--- a/src/calibre/gui2/tweak_book/editor/text.py
+++ b/src/calibre/gui2/tweak_book/editor/text.py
@@ -28,7 +28,8 @@ from calibre.gui2.tweak_book.editor.smart import NullSmarts
 from calibre.gui2.tweak_book.editor.smart.html import HTMLSmarts
 from calibre.gui2.tweak_book.editor.smart.css import CSSSmarts
 from calibre.spell.break_iterator import index_of
-from calibre.utils.icu import safe_chr, string_length
+from calibre.utils.icu import safe_chr, string_length, capitalize, upper, lower, swapcase
+from calibre.utils.titlecase import titlecase
 
 PARAGRAPH_SEPARATOR = '\u2029'
 entity_pat = re.compile(r'&(#{0,1}[a-zA-Z0-9]{1,8});')
@@ -826,3 +827,10 @@ class TextEdit(PlainTextEdit):
             c = self.textCursor()
             c.setPosition(block.position() + col)
             self.setTextCursor(c)
+
+    def change_case(self, action, cursor=None):
+        cursor = cursor or self.textCursor()
+        text = self.selected_text_from_cursor(cursor)
+        text = {'lower':lower, 'upper':upper, 'capitalize':capitalize, 'title':titlecase, 'swap':swapcase}[action](text)
+        cursor.insertText(text)
+        self.setTextCursor(cursor)
diff --git a/src/calibre/gui2/tweak_book/editor/widget.py b/src/calibre/gui2/tweak_book/editor/widget.py
index 6fcccb0a75..9f633f94bb 100644
--- a/src/calibre/gui2/tweak_book/editor/widget.py
+++ b/src/calibre/gui2/tweak_book/editor/widget.py
@@ -488,6 +488,14 @@ class Editor(QMainWindow):
         m.addSeparator()
         m.addAction(_('&Select all'), self.editor.select_all)
         m.addAction(actions['mark-selected-text'])
+        if self.syntax != 'css' and actions['editor-cut'].isEnabled():
+            cm = QMenu(_('Change &case'), m)
+            for ac, text in (
+                    ('upper', _('&Upper case')), ('lower', _('&Lower case')), ('swap', _('&Swap case')),
+                    ('title', _('&Title case')), ('capitalize', _('&Capitalize'))
+            ):
+                cm.addAction(text, partial(self.editor.change_case, ac))
+            m.addMenu(cm)
         if self.syntax == 'html':
             m.addAction(actions['multisplit'])
         m.exec_(self.editor.mapToGlobal(pos))