FakeVim: Emulate Vim option "tildeop" ("top")

Change-Id: I61a07f5edc0e2a062ca10cb17f489ac3ce113d9f
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/fakevim/fakevim_test.cpp

@@ -1604,6 +1604,9 @@ void FakeVimPlugin::test_vim_letter_case()
     TestData data;
     setup(&data);
 
+    // set command ~ not to behave as g~
+    data.doCommand("set notildeop");
+
     // upper- and lower-case
     data.setText("abc DEF");
     KEYS("~", "A" X "bc DEF");
@@ -1616,6 +1619,12 @@ void FakeVimPlugin::test_vim_letter_case()
     KEYS(".", "aBC de" X "F" N "ghi");
     KEYS("h.", "aBC dE" X "f" N "ghi");
 
+    // set command ~ to behave as g~
+    data.doCommand("set tildeop");
+
+    data.setText("abc DEF" N "ghi JKL");
+    KEYS("ll~j", "ABC def" N "GHI jkl");
+
     data.setText("abc DEF");
     KEYS("lv3l~", "a" X "BC dEF");
     KEYS("v4lU", "a" X "BC DEF");

src/plugins/fakevim/fakevimactions.cpp

@@ -195,6 +195,7 @@ FakeVimSettings *theFakeVimSettings()
     createAction(s, ConfigSmartCase,      false, _("SmartCase"),     _("scs"));
     createAction(s, ConfigIgnoreCase,     false, _("IgnoreCase"),    _("ic"));
     createAction(s, ConfigWrapScan,       true,  _("WrapScan"),      _("ws"));
+    createAction(s, ConfigTildeOp,        false, _("TildeOp"),       _("top"));
     createAction(s, ConfigShowCmd,        true,  _("ShowCmd"),       _("sc"));
     createAction(s, ConfigScrollOff,      0,     _("ScrollOff"),     _("so"));
     createAction(s, ConfigBackspace,      _("indent,eol,start"), _("ConfigBackspace"), _("bs"));

src/plugins/fakevim/fakevimactions.h

@@ -78,6 +78,9 @@ enum FakeVimSettingsCode
     ConfigIgnoreCase,
     ConfigWrapScan,
 
+    // command ~ behaves as g~
+    ConfigTildeOp,
+
     // indent  allow backspacing over autoindent
     // eol     allow backspacing over line breaks (join lines)
     // start   allow backspacing over the start of insert; CTRL-W and CTRL-U

src/plugins/fakevim/fakevimhandler.cpp

@@ -3826,7 +3826,7 @@ bool FakeVimHandler::Private::handleNoSubMode(const Input &input)
             else if (input.is('U'))
                 m_submode = UpCaseSubMode;
             finishMovement();
-        } else if (m_gflag) {
+        } else if (m_gflag || (input.is('~') && hasConfig(ConfigTildeOp))) {
             setUndoPosition();
             if (atEndOfLine())
                 moveLeft();