add alt-X for trimming non full lines

README.asciidoc

@@ -59,6 +59,8 @@ Basic Movement
  * _x_: select line on which selection end lies (or next line when end lies on
         an end-of-line)
  * _alt-x_: expand selections to contain full lines (including end-of-lines)
+ * _alt-X_: trim selections to only contain full lines (not including last
+            end-of-line)
 
  * _%_: select whole buffer
 

src/normal.cc

@@ -759,6 +759,7 @@ KeyMap keymap =
     { { Key::Modifiers::None, 'x' }, repeated(select<SelectMode::Replace>(select_line)) },
     { { Key::Modifiers::None, 'X' }, repeated(select<SelectMode::Extend>(select_line)) },
     { { Key::Modifiers::Alt,  'x' }, select<SelectMode::Replace>(select_whole_lines) },
+    { { Key::Modifiers::Alt,  'X' }, select<SelectMode::Replace>(trim_partial_lines) },
 
     { { Key::Modifiers::None, 'm' }, select<SelectMode::Replace>(select_matching) },
     { { Key::Modifiers::None, 'M' }, select<SelectMode::Extend>(select_matching) },

src/selectors.cc

@@ -379,6 +379,22 @@ Selection select_whole_lines(const Selection& selection)
     return Selection(first, last);
 }
 
+Selection trim_partial_lines(const Selection& selection)
+{
+    // same as select_whole_lines
+    BufferIterator first = selection.first();
+    BufferIterator last =  selection.last();
+    BufferIterator& to_line_start = first <= last ? first : last;
+    BufferIterator& to_line_end = first <= last ? last : first;
+
+    while (not is_begin(to_line_start) and *(to_line_start-1) != '\n')
+        ++to_line_start;
+    while (*(to_line_end+1) != '\n' and to_line_end != to_line_start)
+        --to_line_end;
+
+    return Selection(first, last);
+}
+
 Selection select_whole_buffer(const Selection& selection)
 {
     const Buffer& buffer = selection.first().buffer();

src/selectors.hh

@@ -29,6 +29,7 @@ template<bool punctuation_is_word>
 Selection select_whole_word(const Selection& selection, bool inner);
 Selection select_whole_lines(const Selection& selection);
 Selection select_whole_buffer(const Selection& selection);
+Selection trim_partial_lines(const Selection& selection);
 
 template<bool forward>
 Selection select_next_match(const Selection& selection, const Regex& regex);