* lisp/progmodes/prolog.el: Fix up coding conventions and such.
(prolog-indent-width): Use the same default as in previous prolog.el rather than tab-width which depends on which buffer is current when the file is loaded. (prolog-electric-newline-flag): Only enable if electric-indent-mode is not available. (prolog-emacs): Remove. Use (featurep 'xemacs) instead. (prolog-known-systems): Remove. (prolog-mode-syntax-table, prolog-inferior-mode-map): Move initialization into declaration. (prolog-mode-map): Move initialization into declaration. Remove system-specific mode-map vars, since they referred to the same keymap anyway. (prolog-mode-variables): Obey the user's preference w.r.t adaptive-fill-mode. Prefer symbol-value to `eval'. (prolog-mode-keybindings-edit): Add compatibility bindings. (prolog-mode): Use define-derived-mode. Don't handle mercury here. (mercury-mode-map): New var. (mercury-mode, prolog-inferior-mode): Use define-derived-mode. (prolog-ensure-process, prolog-process-insert-string) (prolog-consult-compile): Use with-current-buffer. (prolog-guess-fill-prefix): Simplify data flow. (prolog-replace-in-string): New function to use instead of replace-in-string. (prolog-enable-sicstus-sd): Don't abuse `eval'. (prolog-uncomment-region): Use `uncomment-region' when available. (prolog-electric-colon, prolog-electric-dash): Use `eolp'. (prolog-int-to-char, prolog-char-to-int): New functions to use instead of int-to-char and char-to-int. (prolog-mode-hook, prolog-inferior-mode-hook): Don't force font-lock.
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