Add support for paste all (on <a-[pP]>)

Paste all pastes all yanked text at all selections, selecting each
pasted text.

Replace paste moves to R, and concat yank/concat delete (Y and D)
are removed.

Fixes #161

README.asciidoc

@@ -179,7 +179,6 @@ Changes
  * _i_: insert before current selection
  * _a_: insert after current selection
  * _d_: yank and delete current selection
- * _D_: yank concatenated and delete current selection (see _Y_)
  * _c_: yank and delete current selection and insert
  * _._: repeat last insert mode change (_i_, _a_, or _c_, including
         the inserted text)
@@ -190,11 +189,15 @@ Changes
  * _O_: insert in a new line above current selection begin
 
  * _y_: yank selections
- * _Y_: yank selections concatenated (only one yank, containing
-        all selection concatenated)
  * _p_: paste after current selection end
  * _P_: paste before current selection begin
- * _alt-p_: replace current selection with yanked text
+ * _alt-p_: paste all after current selection end, and
+            select each pasted string.
+ * _alt-P_: paste all before current selection begin, and
+            select each pasted string.
+ * _R_: replace current selection with yanked text
+
+ * _r_: replace each character with the next entered one
 
  * _alt-j_: join selected lines
  * _alt-J_: join selected lines and select spaces inserted
@@ -215,7 +218,6 @@ Changes
  * _u_: undo last change
  * _U_: redo last change
 
- * _r_: replace each character with the next entered one
  * _&_: align selection, align the cursor of selections by inserting
         spaces before the first character of the selection
  * _alt-&_: copy indent, copy the indentation of the main selection

src/normal.cc

@@ -446,17 +446,6 @@ void yank(Context& context, int)
                            " selections", get_color("Information") });
 }
 
-void cat_yank(Context& context, int)
-{
-    auto sels = context.selections_content();
-    String str;
-    for (auto& sel : sels)
-        str += sel;
-    RegisterManager::instance()['"'] = memoryview<String>(str);
-    context.print_status({ "concatenated and yanked " +
-                           to_string(sels.size()) + " selections", get_color("Information") });
-}
-
 void erase_selections(Context& context, int)
 {
     RegisterManager::instance()['"'] = context.selections_content();
@@ -465,18 +454,6 @@ void erase_selections(Context& context, int)
     context.selections().avoid_eol();
 }
 
-void cat_erase_selections(Context& context, int)
-{
-    auto sels = context.selections_content();
-    String str;
-    for (auto& sel : sels)
-        str += sel;
-    RegisterManager::instance()['"'] = memoryview<String>(str);
-    context.selections().erase();
-    context.selections().avoid_eol();
-}
-
-
 void change(Context& context, int param)
 {
     RegisterManager::instance()['"'] = context.selections_content();
@@ -510,6 +487,42 @@ void paste(Context& context, int)
     context.selections().insert(strings, effective_mode);
 }
 
+template<InsertMode mode>
+void paste_all(Context& context, int)
+{
+    auto strings = RegisterManager::instance()['"'].values(context);
+    InsertMode effective_mode = mode;
+    String all;
+    std::vector<ByteCount> offsets;
+    for (auto& str : strings)
+    {
+        if (not str.empty() and str.back() == '\n')
+            effective_mode = adapt_for_linewise(mode);
+        all += str;
+        offsets.push_back(all.length());
+    }
+
+    auto& selections = context.selections();
+    {
+        ScopedEdition edition(context);
+        selections.insert(all, effective_mode, true);
+    }
+
+    const Buffer& buffer = context.buffer();
+    std::vector<Selection> result;
+    for (auto& selection : selections)
+    {
+        ByteCount pos = 0;
+        for (auto offset : offsets)
+        {
+            result.push_back({ buffer.advance(selection.min(), pos),
+                               buffer.advance(selection.min(), offset-1) });
+            pos = offset;
+        }
+    }
+    selections = std::move(result);
+}
+
 template<typename T>
 void regex_prompt(Context& context, const String prompt, T func)
 {
@@ -1250,7 +1263,6 @@ KeyMap keymap =
     { alt('F'), select_to_next_char<SelectFlags::Inclusive | SelectFlags::Extend | SelectFlags::Reverse> },
 
     { 'd', erase_selections },
-    { 'D', cat_erase_selections },
     { 'c', change },
     { 'i', enter_insert_mode<InsertMode::Insert> },
     { 'I', enter_insert_mode<InsertMode::InsertAtLineBegin> },
@@ -1266,10 +1278,11 @@ KeyMap keymap =
     { 'v', view_commands },
 
     { 'y', yank },
-    { 'Y', cat_yank },
     { 'p', repeated(paste<InsertMode::Append>) },
     { 'P', repeated(paste<InsertMode::Insert>) },
-    { alt('p'), paste<InsertMode::Replace> },
+    { alt('p'), paste_all<InsertMode::Append> },
+    { alt('P'), paste_all<InsertMode::Insert> },
+    { 'R', paste<InsertMode::Replace> },
 
     { 's', select_regex },
     { 'S', split_regex },

src/selection.cc

@@ -463,7 +463,8 @@ BufferIterator prepare_insert(Buffer& buffer, const Selection& sel, InsertMode m
     return {};
 }
 
-void SelectionList::insert(memoryview<String> strings, InsertMode mode)
+void SelectionList::insert(memoryview<String> strings, InsertMode mode,
+                           bool select_inserted)
 {
     if (strings.empty())
         return;
@@ -496,7 +497,7 @@ void SelectionList::insert(memoryview<String> strings, InsertMode mode)
         changes_tracker.update(change);
         m_timestamp = m_buffer->timestamp();
 
-        if (mode == InsertMode::Replace)
+        if (select_inserted or mode == InsertMode::Replace)
         {
             sel.anchor() = change.begin;
             sel.cursor() = m_buffer->char_prev(change.end);

src/selection.hh

@@ -124,7 +124,8 @@ struct SelectionList
     size_t timestamp() const { return m_timestamp; }
     void update_timestamp() { m_timestamp = m_buffer->timestamp(); }
 
-    void insert(memoryview<String> strings, InsertMode mode);
+    void insert(memoryview<String> strings, InsertMode mode,
+                bool select_inserted = false);
     void erase();
 
 private: