Add a nop command to avoid accidental shell output evaluation

README.asciidoc

@@ -194,6 +194,12 @@ Commands are entered using +:+.
       or *g*lobal scope.
  * +c[ol]a[lias] <name> <colspec>+: define a color alias, so that name can be
       used instead of colspec in contexts where a color is needed.
+ * +nop+: does nothing, but as with every other commands, arguments may be
+      evaluated. So nop can be used for example to execute a shell command
+      while being sure that it's output will not be interpreted by kak.
+      :%sh{ echo echo tchou } will echo tchou in kakoune, wherease
+      :nop %sh{ echo echo tchou } will not, but both will execute the
+      shell command.
 
 String syntax
 -------------

src/commands.cc

@@ -674,6 +674,8 @@ void register_commands()
 {
     CommandManager& cm = CommandManager::instance();
 
+    cm.register_commands({"nop"}, [](const CommandParameters&, Context&){});
+
     PerArgumentCommandCompleter filename_completer({ complete_filename });
     cm.register_commands({ "e", "edit" }, edit<false>, filename_completer);
     cm.register_commands({ "e!", "edit!" }, edit<true>, filename_completer);

src/rc/grep.kak

@@ -9,10 +9,10 @@ def -shell-params -file-completion \
      else
          ( ${kak_opt_grepcmd} "${kak_selection}" >& ${output} ) >& /dev/null < /dev/null &
      fi
-     echo "try %{ db *grep* } catch %{ }
+     echo "try %{ db *grep* } catch %{}
            edit -fifo ${output} *grep*
            setb filetype grep
-           hook buffer BufClose .* %{ %sh{ rm -r $(dirname ${output}) } }"
+           hook buffer BufClose .* %{ nop %sh{ rm -r $(dirname ${output}) } }"
 }}
 
 hook global WinSetOption filetype=grep %{

src/rc/make.kak

@@ -2,10 +2,10 @@ def -shell-params make %{ %sh{
      output=$(mktemp -d -t kak-make.XXXXXXXX)/fifo
      mkfifo ${output}
      ( make $@ >& ${output} ) >& /dev/null < /dev/null &
-     echo "try %{ db *make* } catch %{ }
+     echo "try %{ db *make* } catch %{}
            edit -fifo ${output} *make*
            setb filetype make
-           hook buffer BufClose .* %{ %sh{ rm -r $(dirname ${output}) } }"
+           hook buffer BufClose .* %{ nop %sh{ rm -r $(dirname ${output}) } }"
 }}
 
 hook global WinSetOption filetype=make %{