Provide a simple generic indentation engine and use it for Prolog.

* emacs-lisp/smie.el: New file.
* progmodes/prolog.el (prolog-smie-op-levels)
(prolog-smie-indent-rules): New var.
(prolog-mode-variables): Use them to configure SMIE.
(prolog-indent-line, prolog-indent-level): Remove.

1 files changed, 10 insertions, 2 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index f0c38093d86..48e1148ae6b 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -2077,7 +2077,11 @@ to `shell-command-history'."
 
 Like `shell-command' but if COMMAND doesn't end in ampersand, adds `&'
 surrounded by whitespace and executes the command asynchronously.
-The output appears in the buffer `*Async Shell Command*'."
+The output appears in the buffer `*Async Shell Command*'.
+
+In Elisp, you will often be better served by calling `start-process'
+directly, since it offers more control and does not impose the use of a
+shell (with its need to quote arguments)."
   (interactive
    (list
     (read-shell-command "Async shell command: " nil nil
@@ -2138,7 +2142,11 @@ If the optional third argument ERROR-BUFFER is non-nil, it is a buffer
 or buffer name to which to direct the command's standard error output.
 If it is nil, error output is mingled with regular output.
 In an interactive call, the variable `shell-command-default-error-buffer'
-specifies the value of ERROR-BUFFER."
+specifies the value of ERROR-BUFFER.
+
+In Elisp, you will often be better served by calling `call-process' or
+`start-process' directly, since it offers more control and does not impose
+the use of a shell (with its need to quote arguments)."
 
   (interactive
    (list