Add indent object type (bound to i)

README.asciidoc

@@ -218,6 +218,7 @@ object you want.
  * _W_: select the whole WORD
  * _s_: select the sentence
  * _p_: select the paragraph
+ * _i_: select the current indentation block
 
 Registers
 ---------

src/normal.cc

@@ -582,6 +582,7 @@ void select_object(Context& context)
             { { Key::Modifiers::None, 'W' }, std::bind(select_whole_word<true>, _1, _2, flags) },
             { { Key::Modifiers::None, 's' }, std::bind(select_whole_sentence, _1, _2, flags) },
             { { Key::Modifiers::None, 'p' }, std::bind(select_whole_paragraph, _1, _2, flags) },
+            { { Key::Modifiers::None, 'i' }, std::bind(select_whole_indent, _1, _2, flags) },
         };
 
         auto it = key_to_selector.find(key);

src/selectors.cc

@@ -494,6 +494,45 @@ Selection select_whole_paragraph(const Buffer& buffer, const Selection& selectio
                                         : Selection{last.coord(), first.coord()};
 }
 
+static CharCount get_indent(const String& str, int tabstop)
+{
+    CharCount indent = 0;
+    for (auto& c : str)
+    {
+    if (c == ' ')
+        ++indent;
+    else if (c =='\t')
+        indent = (indent / tabstop + 1) * tabstop;
+    else
+        break;
+    }
+    return indent;
+}
+
+Selection select_whole_indent(const Buffer& buffer, const Selection& selection, ObjectFlags flags)
+{
+    int tabstop = buffer.options()["tabstop"].get<int>();
+    LineCount line = selection.last().line;
+    auto indent = get_indent(buffer[line], tabstop);
+
+    LineCount begin_line = line - 1;
+    if (flags & ObjectFlags::ToBegin)
+    {
+        while (begin_line >= 0 and (buffer[begin_line] == "\n" or get_indent(buffer[begin_line], tabstop) >= indent))
+            --begin_line;
+    }
+    ++begin_line;
+    LineCount end_line = line + 1;
+    if (flags & ObjectFlags::ToEnd)
+    {
+        LineCount end = buffer.line_count();
+        while (end_line < end and (buffer[end_line] == "\n" or get_indent(buffer[end_line], tabstop) >= indent))
+            ++end_line;
+    }
+    --end_line;
+    return Selection{begin_line, {end_line, buffer[end_line].length() - 1}};
+}
+
 Selection select_whole_lines(const Buffer& buffer, const Selection& selection)
 {
     // no need to be utf8 aware for is_eol as we only use \n as line seperator

src/selectors.hh

@@ -48,6 +48,8 @@ Selection select_whole_sentence(const Buffer& buffer, const Selection& selection
                                 ObjectFlags flags);
 Selection select_whole_paragraph(const Buffer& buffer, const Selection& selection,
                                  ObjectFlags flags);
+Selection select_whole_indent(const Buffer& buffer, const Selection& selection,
+                              ObjectFlags flags);
 Selection select_whole_lines(const Buffer& buffer, const Selection& selection);
 Selection select_whole_buffer(const Buffer& buffer, const Selection& selection);
 Selection trim_partial_lines(const Buffer& buffer, const Selection& selection);