Move rotate selection and rotate selection contents to ) and <a-)>

Backward rotation are supported with (.

Fixes #1210

doc/keymap

@@ -1,5 +1,5 @@
 ┌───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┲━━━━━━━━━━━━━━┓
-│  upper│ cmdout│convtab│       │selpipe│sel all│       │  align│pattern│       │       │   trim│       ┃ ⇤            ┃
+│  upper│ cmdout│convtab│       │selpipe│sel all│       │  align│pattern│ rotate│ rotate│   trim│       ┃ ⇤            ┃
 ├┄┄CASE┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┨              ┃
 │  lower│ 1     │ 2     │ 3     │ 4     │ 5     │ 6     │ 7     │ 8     │ 9     │ 0     │       │       ┃              ┃
 ┢━━━━━━━┷━━━┱───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┺━━━┳━━━━━━━━━━┫
@@ -9,7 +9,7 @@
 ┣━━━━━━━━━━━┻━┱─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┴─┬─────┺━┓        ┃
 ┃ ⇬           ┃ APPEND│  split│       │     ᵐʳ│     ᵐᵍ│     ᵐˡ│      ᵐ│      ᵐ│     ᵐˡ│cmdline│use reg│   pipe┃        ┃
 ┃             ┠┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┤   find│  goto │       │       │       │       ├┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┨        ┃
-┃             ┃ append│ select│ delete│   char│       │     ← │     ↓ │     ↑ │     → │ cursor│ rotate│eschook┃        ┃
+┃             ┃ append│ select│ delete│   char│       │     ← │     ↓ │     ↑ │     → │ cursor│       │eschook┃        ┃
 ┣━━━━━━━━━┳━━━┹───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┬───┴───┲━━━┷━━━━━━━┻━━━━━━━━┫
 ┃         ┃ indent│   save│      ᵐ│copysel│      ᵛ│     ᵐʷ│     ᵐʳ│       │ dedent│ indent│     ᵐʳ┃                    ┃
 ┃         ┠┄┄┄┄┄┄┄┼┄MARKS┄┤ select├┄┄┄┄┄┄┄┤   view│   prev│ search│  match├┄┄┄┄┄┄┄┼┄┄┄┄┄┄┄┤ search┃                    ┃

doc/pages/keys.asciidoc

@@ -196,11 +196,11 @@ is a sequence of non whitespace characters
 *<c-d>*::
     scroll half a page down
 
-*'*::
-    rotate selections (the main selection becomes the next one)
+*)*::
+    rotate main selection (the main selection becomes the next one)
 
-*<a-'>*::
-    rotate selections backwards
+*(*::
+    rotate main selection backward (the main selection becomes the previous one)
 
 *;*::
     reduce selections to their cursor
@@ -362,7 +362,7 @@ is a sequence of non whitespace characters
 *_*::
     trim selections
 
-*<a-">*::
+*<a-)>*::
     rotate selections content, if specified, the count groups selections,
     so the following command
 
@@ -372,6 +372,9 @@ is a sequence of non whitespace characters
 
     rotate (1, 2, 3) and (3, 4, 6) independently
 
+*<a-(>*::
+    rotate selections content backward
+
 == Goto commands
 
 *g*, *G*::

src/normal.cc

@@ -1365,10 +1365,11 @@ void rotate_selections(Context& context, NormalParams params)
                               : (index + (num - count % num)) % num);
 }
 
+template<Direction direction>
 void rotate_selections_content(Context& context, NormalParams params)
 {
-    int group = params.count;
-    int count = 1;
+    size_t group = params.count;
+    size_t count = 1;
     auto strings = context.selections_content();
     if (group == 0 or group > (int)strings.size())
         group = (int)strings.size();
@@ -1376,13 +1377,20 @@ void rotate_selections_content(Context& context, NormalParams params)
     for (auto it = strings.begin(); it != strings.end(); )
     {
         auto end = std::min(strings.end(), it + group);
+        if (direction == Direction::Forward)
             std::rotate(it, end-count, end);
+        else
+            std::rotate(it, it+count, end);
         it = end;
     }
     auto& selections = context.selections();
     selections.insert(strings, InsertMode::Replace);
-    selections.set_main_index((selections.main_index() + count) %
-                              selections.size());
+    const size_t index = selections.main_index();
+    const size_t index_in_group = index % group;
+    selections.set_main_index(index - index_in_group +
+                              (direction == Forward) ?
+                                (index_in_group + count) % group
+                              : (index_in_group + group - count % group) % group);
 }
 
 enum class SelectFlags
@@ -2182,9 +2190,10 @@ static const HashMap<Key, NormalCmd, MemoryDomain::Undefined, KeymapBackend> key
     { {ctrl('o')}, {"jump backward in jump list", jump<Backward>} },
     { {ctrl('s')}, {"push current selections in jump list", push_selections} },
 
-    { {'\''}, {"rotate main selection forward", rotate_selections<Forward>} },
-    { {alt('\'')}, {"rotate main selection backward", rotate_selections<Backward>} },
-    { {alt('"')}, {"rotate selections content", rotate_selections_content} },
+    { {')'}, {"rotate main selection forward", rotate_selections<Forward>} },
+    { {'('}, {"rotate main selection backward", rotate_selections<Backward>} },
+    { {alt(')')}, {"rotate selections content forward", rotate_selections_content<Forward>} },
+    { {alt('(')}, {"rotate selections content backward", rotate_selections_content<Backward>} },
 
     { {'q'}, {"replay recorded macro", replay_macro} },
     { {'Q'}, {"start or end macro recording", start_or_end_macro_recording} },

test/normal/rotate-content/cmd

@@ -1 +1 @@
-<a-">
+<a-)>

test/normal/rotate/cmd

@@ -1 +1 @@
-'<a-space>
+)<a-space>

test/normal/trim/cmd

@@ -1 +1 @@
-%<a-s>_<a-">
+%<a-s>_<a-)>