Some documentation

base/ltcmd.dtx

@@ -2226,10 +2226,9 @@
 % we'll just print stuff to the terminal.
 %
 % \begin{macro}{\@@_show:N}
-%   This macro just branches to the proper copying command by using
-%   \cs{@@_cmd_type_cases:NnnnF}.  The copying command takes the names
-%   of the commands to be copied to and from, and the actual commands
-%   as its four arguments.
+%   This macro just branches to the proper showing command by using
+%   \cs{@@_cmd_type_cases:NnnnF}.  The showing command takes the command
+%   to be shown as argument.
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_show:N #1
   {
@@ -2246,7 +2245,21 @@
         \int_set:Nn \tex_escapechar:D { \int_use:N \tex_escapechar:D }
       }
   }
+%    \end{macrocode}
+% \end{macro}
 %
+% \begin{macro}{
+%     \@@_show_command:N,
+%     \@@_show_command:NnNNwN,
+%     \@@_show_expandable:N,
+%     \@@_show_expandable:NnNNNNnN,
+%     \@@_show_command_aux:nNNn,
+%     \@@_show_environment:N,
+%   }
+%   These commands just expand the command once to reveal its innards,
+%   then pass the type of command, the control sequence, the signature,
+%   and the code macro to \cs{@@_show_command_aux:nNNn}.
+%    \begin{macrocode}
 \cs_new_protected:Npn \@@_show_command:N #1
   { \exp_after:wN \@@_show_command:NnNNwN #1 \q_@@ #1 }
 \cs_new_protected:Npn \@@_show_command:NnNNwN #1 #2 #3 #4 #5 \q_@@ #6
@@ -2255,19 +2268,26 @@
   { \exp_after:wN \@@_show_expandable:NnNNNNnN #1 #1 }
 \cs_new_protected:Npn \@@_show_expandable:NnNNNNnN #1 #2 #3 #4 #5 #6 #7 #8
   { \@@_show_command_aux:nNNn { expandable~document~command } #8 #5 {#2} }
+%    \end{macrocode}
+%
+%   And now just pretty-print everything:
+%    \begin{macrocode}
 \cs_new_protected:Npn \@@_show_command_aux:nNNn #1 #2 #3 #4
   {
-    \iow_term:x { > ~ \token_to_str:N #2 = #1: }
-    \iow_term:x { > ~ signature = \tl_to_str:n {#4} . }
     \iow_term:x
       {
+        > ~ \token_to_str:N #2 = #1: \iow_newline:
+        > ~ signature = \tl_to_str:n {#4} . \iow_newline:
         > ~ \token_to_str:N #3 ~ (
         \int_eval:n
           { \exp_args:Nf \str_count:n { \cs_argument_spec:N #3 } / 2 } ~
         parameters ) : \cs_replacement_spec:N #3
       }
   }
+%    \end{macrocode}
 %
+%   But complain when used with an environment:
+%    \begin{macrocode}
 \cs_new_protected:Npn \@@_show_environment:N #1
   { \msg_error:nn { cmd } { env-show } }
 \msg_new:nnn { cmd } { env-show }