Add support for -itersel option in exec/eval

-itersel makes a -draft eval/exec run once for each selections
separately rather than with all selections at a time.

README.asciidoc

@@ -299,10 +299,14 @@ Commands are entered using +:+.
       is relative to kak executable path.
  * +nameclient <name>+: set current client name
  * +namebuf <name>+: set current buffer name
- * +exec [-client <name>] <keys>+: execute <keys> as if pressed in normal mode.
-      if client if specified, exec keys in the named client context.
- * +eval [-client <name>] <command>+: execute <command> as if entered in command line
-      if client if specified, exec command in the named client context.
+ * +exec [-client <name>] [-draft [-itersel]] <keys>+: execute <keys> as if
+     pressed in normal mode. if +client+ if specified, exec keys in the named
+     client context. if +draft+ is specified, execute the keys in a draft
+     context. if +itersel+ is specified, apply the keys on each selection
+     separately.
+ * +eval [-client <name>] [-draft [-itersel]] <command>+: execute <command> as
+     if entered in command line. +draft+, +client+ and +itersel+ works the same
+     as for the +exec+ command.
  * +echo <text>+: show <text> in status line
  * +name <name>+: sets current client name to name
  * +nop+: does nothing, but as with every other commands, arguments may be

src/commands.cc

@@ -540,7 +540,7 @@ public:
 template<typename Func>
 void context_wrap(CommandParameters params, Context& context, Func func)
 {
-    ParametersParser parser(params, { { "client", true }, { "draft", false }},
+    ParametersParser parser(params, { { "client", true }, { "draft", false }, { "itersel", false } },
                             ParametersParser::Flags::OptionsOnlyAtStart, 1);
 
     Context& real_context = parser.has_option("client") ?
@@ -554,10 +554,24 @@ void context_wrap(CommandParameters params, Context& context, Func func)
                       real_context.has_client() ? real_context.client().name() : "");
         DynamicSelectionList sels{editor.buffer(), editor.selections()};
         auto restore_sels = on_scope_end([&]{ editor.select(sels); });
+
+        if (parser.has_option("itersel"))
+        {
+            for (auto& sel : sels)
+            {
+                editor.select(sel);
+                func(parser, client.context());
+            }
+        }
+        else
             func(parser, client.context());
     }
     else
+    {
+        if (parser.has_option("itersel"))
+            throw runtime_error("-itersel makes no sense without -draft");
         func(parser, real_context);
+    }
 
     // force redraw of this client window
     if (parser.has_option("client") and real_context.has_window())

src/rc/cpp.kak

@@ -19,13 +19,13 @@ hook global WinSetOption filetype=cpp %~
     addhl -group cpp-highlight regex "(?<!')\".*?(?<!\\)(\\\\)*\"" 0:string
     addhl -group cpp-highlight regex "(//[^\n]*\n)|(/\*.*?(\*/|\'))" 0:comment
     hook window InsertEnd .* -id cpp-hooks %{ try %{ exec -draft <a-x>s\h+$<ret>d } } # cleanup trailing whitespaces when exiting insert mode
-    hook window InsertChar \n -id cpp-hooks %[ try %{ exec -draft k<a-x>s\h+$<ret>d } ] # cleanup trailing white space son previous line
 
-    hook window InsertChar \n -id cpp-indent %@
+    hook window InsertChar \n -id cpp-indent %@ eval -draft -itersel %_
         try %{ exec -draft k<a-x>s^\h+<ret>yj<a-h>P } # preserve previous line indent
         try %[ exec -draft k<a-x><a-k>[{(]\h*$<ret>j<a-gt> ] # indent after lines ending with { or (
+        try %{ exec -draft k<a-x>s\h+$<ret>d } # cleanup trailing white space son previous line
         try %{ exec -draft [(<a-k>\`\([^\n]+\n[^\n]*\n?\'<ret>s\`..|.\'<ret>& } # align to opening paren of previous line
-    @
+    _ @
     hook window InsertChar \} -id cpp-indent %[ try %[ exec -draft <a-h><a-k>^\h+\}$<ret>< ] ] # deindent on insert } alone on a line
 ~