vim-mode: support shorcuts to jump between titles

- `[[`: jump to previous title;
- `]]`: jump to next title;
- `[]`: jump to previous title at the same level;
- `][`: jump to next title at the same level;
- `[{`: jump to previous title at a higher level;
- `]}`: jump to next title at a higher level;

src/resources/docs/shortcuts_en.md

@@ -57,6 +57,8 @@ Delete all the characters from current cursor to the beginning of current line.
 Insert title at level `<Num>`. `<Num>` should be 1 to 6. Currently selected text will be changed to title if exist.
 - `Tab`/`Shift+Tab`  
 Increase or decrease the indentation. If any text is selected, the indentation will operate on all these selected lines.
+- `Shift+Enter`  
+Insert two spaces followed by a new line, namely a soft linebreak in Markdown.
 - `Shift+Left`, `Shift+Right`, `Shift+Up`, `Shift+Down`  
 Expand the selection one character left or right, or one line up or down.
 - `Ctrl+Shift+Left`, `Ctrl+Shift+Right`  
@@ -132,6 +134,13 @@ VNote supports following features of Vim:
 - `u` and `Ctrl+R` for undo and redo;
 - Text objects `i/a`: word, WORD, `''`, `""`, `` ` ` ``, `()`, `[]`, `<>`, and `{}`;
 - Command line `:w`, `:wq`, `:x`, `:q`, and `:q!`;
+- Jump between titles
+    - `[[`: jump to previous title;
+    - `]]`: jump to next title;
+    - `[]`: jump to previous title at the same level;
+    - `][`: jump to next title at the same level;
+    - `[{`: jump to previous title at a higher level;
+    - `]}`: jump to next title at a higher level;
 
 For now, VNote does **NOT** support the macro and repeat(`.`) features of Vim.
 

src/resources/docs/shortcuts_zh.md

@@ -57,6 +57,8 @@
 插入级别为`<Num>`的标题。`<Num>`应该是1到6的一个数字。如果已经选择文本，则将当前选择文本改为标题。
 - `Tab`/`Shift+Tab`  
 增加或减小缩进。如果已经选择文本，则对所有选择的行进行缩进操作。
+- `Shift+Enter`  
+插入两个空格然后换行，在Markdown中类似于软换行的概念。
 - `Shift+Left`, `Shift+Right`, `Shift+Up`, `Shift+Down`  
 扩展选定左右一个字符，或上下一行。
 - `Ctrl+Shift+Left`, `Ctrl+Shift+Right`  
@@ -131,6 +133,13 @@ VNote支持以下几个Vim的特性：
 - `u` 和 `Ctrl+R` 撤销和重做；
 - 文本对象 `i/a`：word, WORD, `''`, `""`, `` ` ` ``, `()`, `[]`, `<>`, and `{}`;
 - 命令行 `:w`, `:wq`, `:x`, `:q`, and `:q!`;
+- 标题跳转
+    - `[[`：跳转到上一个标题；
+    - `]]`: 跳转到下一个标题；
+    - `[]`：跳转到上一个同层级的标题；
+    - `][`：跳转到下一个同层级的标题；
+    - `[{`：跳转到上一个高一层级的标题；
+    - `]}`：跳转到下一个高一层级的标题；
 
 VNote目前暂时不支持Vim的宏和重复(`.`)特性。
 

src/utils/vvim.cpp

@@ -1173,7 +1173,22 @@ bool VVim::handleKeyPressEvent(int key, int modifiers, int *p_autoIndentPos)
                 addRangeToken(range);
                 processCommand(m_tokens);
                 break;
+            } else if (hasActionToken() || !checkMode(VimMode::Normal)) {
+                // Invalid sequence.
+                break;
+            } else if (m_keys.isEmpty()) {
+                // First ], pend it.
+                m_keys.append(keyInfo);
+                goto accept;
+            } else if (checkPendingKey(keyInfo)) {
+                // ]], goto next title, regardless of level.
+                processTitleJump(m_tokens, true, 1);
+            } else if (checkPendingKey(Key(Qt::Key_BracketLeft))) {
+                // [], goto previous title at the same level.
+                processTitleJump(m_tokens, false, 0);
             }
+
+            break;
         }
 
         break;
@@ -1197,6 +1212,19 @@ bool VVim::handleKeyPressEvent(int key, int modifiers, int *p_autoIndentPos)
                 addRangeToken(range);
                 processCommand(m_tokens);
                 break;
+            } else if (hasActionToken() || !checkMode(VimMode::Normal)) {
+                // Invalid sequence.
+                break;
+            } else if (m_keys.isEmpty()) {
+                // First [, pend it.
+                m_keys.append(keyInfo);
+                goto accept;
+            } else if (checkPendingKey(keyInfo)) {
+                // [[, goto previous title, regardless of level.
+                processTitleJump(m_tokens, false, 1);
+            } else if (checkPendingKey(Key(Qt::Key_BracketRight))) {
+                // ][, goto next title at the same level.
+                processTitleJump(m_tokens, true, 0);
             }
 
             break;
@@ -1855,7 +1883,15 @@ bool VVim::handleKeyPressEvent(int key, int modifiers, int *p_autoIndentPos)
                 addRangeToken(range);
                 processCommand(m_tokens);
                 break;
+            } else if (hasActionToken() || !checkMode(VimMode::Normal)) {
+                // Invalid sequence.
+                break;
+            } else if (checkPendingKey(Key(Qt::Key_BracketLeft))) {
+                // [{, goto previous title at one higher level.
+                processTitleJump(m_tokens, false, -1);
             }
+
+            break;
         }
 
         break;
@@ -1876,7 +1912,15 @@ bool VVim::handleKeyPressEvent(int key, int modifiers, int *p_autoIndentPos)
                 addRangeToken(range);
                 processCommand(m_tokens);
                 break;
+            } else if (hasActionToken() || !checkMode(VimMode::Normal)) {
+                // Invalid sequence.
+                break;
+            } else if (checkPendingKey(Key(Qt::Key_BracketRight))) {
+                // ]}, goto next title at one higher level.
+                processTitleJump(m_tokens, true, -1);
             }
+
+            break;
         }
 
         break;
@@ -4881,3 +4925,24 @@ QChar VVim::Marks::getLastUsedMark() const
 {
     return m_lastUsedMark;
 }
+
+void VVim::processTitleJump(const QList<Token> &p_tokens, bool p_forward, int p_relativeLevel)
+{
+    int repeat = 1;
+    if (p_tokens.size() == 1) {
+        Token to = p_tokens.first();
+        if (to.isRepeat()) {
+            repeat = to.m_repeat;
+        } else {
+            return;
+        }
+    } else if (!p_tokens.isEmpty()) {
+        return;
+    }
+
+    QTextCursor cursor = m_editor->textCursor();
+    if (m_editor->jumpTitle(p_forward, p_relativeLevel, repeat)) {
+        // Record current location.
+        m_locations.addLocation(cursor);
+    }
+}

src/utils/vvim.h

@@ -662,6 +662,10 @@ private:
     // P: "+P
     bool processLeaderSequence(const Key &p_key);
 
+    // Jump across titles.
+    // [[, ]], [], ][, [{, ]}.
+    void processTitleJump(const QList<Token> &p_tokens, bool p_forward, int p_relativeLevel);
+
     VEdit *m_editor;
     const VEditConfig *m_editConfig;
     VimMode m_mode;

src/vedit.cpp

@@ -790,3 +790,11 @@ void VEdit::requestUpdateVimStatus()
         emit vimStatusUpdated(NULL);
     }
 }
+
+bool VEdit::jumpTitle(bool p_forward, int p_relativeLevel, int p_repeat)
+{
+    Q_UNUSED(p_forward);
+    Q_UNUSED(p_relativeLevel);
+    Q_UNUSED(p_repeat);
+    return false;
+}

src/vedit.h

@@ -110,6 +110,14 @@ signals:
 public slots:
     virtual void highlightCurrentLine();
 
+    // Jump to a title.
+    // @p_forward: jump forward or backward.
+    // @p_relativeLevel: 0 for the same level as current header;
+    //                   negative value for upper level;
+    //                   positive value is ignored.
+    // Returns true if the jump succeeded.
+    virtual bool jumpTitle(bool p_forward, int p_relativeLevel, int p_repeat);
+
 private slots:
     void labelTimerTimeout();
     void highlightSelectedWord();

src/vmdedit.cpp

@@ -264,10 +264,10 @@ void VMdEdit::clearUnusedImages()
     m_initImages.clear();
 }
 
-void VMdEdit::updateCurHeader()
+int VMdEdit::currentCursorHeader() const
 {
     if (m_headers.isEmpty()) {
-        return;
+        return -1;
     }
 
     int curLine = textCursor().block().firstLineNumber();
@@ -281,13 +281,26 @@ void VMdEdit::updateCurHeader()
     }
 
     if (i == -1) {
+        return -1;
+    } else {
+        Q_ASSERT(m_headers[i].index == i);
+        return i;
+    }
+}
+
+void VMdEdit::updateCurHeader()
+{
+    if (m_headers.isEmpty()) {
+        return;
+    }
+
+    int idx = currentCursorHeader();
+    if (idx == -1) {
         emit curHeaderChanged(VAnchor(m_file, "", -1, -1));
         return;
     }
 
-    V_ASSERT(m_headers[i].index == i);
-
-    emit curHeaderChanged(VAnchor(m_file, "", m_headers[i].lineNumber, m_headers[i].index));
+    emit curHeaderChanged(VAnchor(m_file, "", m_headers[idx].lineNumber, m_headers[idx].index));
 }
 
 void VMdEdit::generateEditOutline()
@@ -454,3 +467,91 @@ const QVector<VHeader> &VMdEdit::getHeaders() const
 {
     return m_headers;
 }
+
+bool VMdEdit::jumpTitle(bool p_forward, int p_relativeLevel, int p_repeat)
+{
+    if (m_headers.isEmpty()) {
+        return false;
+    }
+
+    QTextCursor cursor = textCursor();
+    int cursorLine = cursor.block().firstLineNumber();
+    int targetIdx = -1;
+    // -1: skip level check.
+    int targetLevel = 0;
+    int idx = currentCursorHeader();
+    if (idx == -1) {
+        // Cursor locates at the beginning, before any headers.
+        if (p_relativeLevel < 0 || !p_forward) {
+            return false;
+        }
+    }
+
+    int delta = 1;
+    if (!p_forward) {
+        delta = -1;
+    }
+
+    bool firstHeader = true;
+    for (targetIdx = idx == -1 ? 0 : idx;
+         targetIdx >= 0 && targetIdx < m_headers.size();
+         targetIdx += delta) {
+        const VHeader &header = m_headers[targetIdx];
+        if (header.isEmpty()) {
+            continue;
+        }
+
+        if (targetLevel == 0) {
+            // The target level has not been init yet.
+            Q_ASSERT(firstHeader);
+            targetLevel = header.level;
+            if (p_relativeLevel < 0) {
+                targetLevel += p_relativeLevel;
+                if (targetLevel < 1) {
+                    // Invalid level.
+                    return false;
+                }
+            } else if (p_relativeLevel > 0) {
+                targetLevel = -1;
+            }
+        }
+
+        if (targetLevel == -1 || header.level == targetLevel) {
+            if (firstHeader
+                && (cursorLine == header.lineNumber
+                    || p_forward)
+                && idx != -1) {
+                // This header is not counted for the repeat.
+                firstHeader = false;
+                continue;
+            }
+
+            if (--p_repeat == 0) {
+                // Found.
+                break;
+            }
+        } else if (header.level < targetLevel) {
+            // Stop by higher level.
+            return false;
+        }
+
+        firstHeader = false;
+    }
+
+    if (targetIdx < 0 || targetIdx >= m_headers.size()) {
+        return false;
+    }
+
+    // Jump to target header.
+    int line = m_headers[targetIdx].lineNumber;
+    if (line > -1) {
+        QTextBlock block = document()->findBlockByLineNumber(line);
+        if (block.isValid()) {
+            cursor.setPosition(block.position());
+            setTextCursor(cursor);
+            return true;
+        }
+    }
+
+    return false;
+}

src/vmdedit.h

@@ -39,6 +39,9 @@ public:
 
     const QVector<VHeader> &getHeaders() const;
 
+public slots:
+    bool jumpTitle(bool p_forward, int p_relativeLevel, int p_repeat) Q_DECL_OVERRIDE;
+
 signals:
     void headersChanged(const QVector<VHeader> &headers);
 
@@ -68,13 +71,18 @@ protected:
 private:
     void initInitImages();
     void clearUnusedImages();
+
     // p_text[p_index] is QChar::ObjectReplacementCharacter. Remove the line containing it.
     // Returns the index of previous line's '\n'.
     int removeObjectReplacementLine(QString &p_text, int p_index) const;
+
     // There is a QChar::ObjectReplacementCharacter in the selection.
     // Get the QImage.
     QImage selectedImage();
 
+    // Return the header index in m_headers where current cursor locates.
+    int currentCursorHeader() const;
+
     HGMarkdownHighlighter *m_mdHighlighter;
     VCodeBlockHighlightHelper *m_cbHighlighter;
     VImagePreviewer *m_imagePreviewer;