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;;; pam-env.el --- Major mode for pam_env.conf(5) files.
;;; Commentary:
;; This major mode font-locks files including ~/.pam_environment and
;; /etc/security/pam_env.conf, but notably not /etc/environment. Their format is
;; specified by the pam_env.conf(5) man page.
;; TODO: Only apply font-lock-variable-name-face to variable declarations if
;; the previous line didn't end with a backslash. The following case didn't
;; work (some declarations that should've been font-locked weren't):
;; '("\\(?:^$\\|[^\\\\]\\)[\r\n]\\([^[:blank:]]+\\)"
;; 1 font-lock-variable-name-face keep)
;; pam_env does not support escaped double quotes ("). Single-quoted strings are
;; not used as string delimiters. We can only match against word chars in
;; `pam-env-mode/font-lock-defaults', so make double quotes word chars.
;;; Code:
(defconst pam-env-mode/font-lock-defaults
'((("^#+" . font-lock-comment-delimiter-face)
("^#+[[:blank:]]*\\(.*\\)$" 1 font-lock-comment-face)
("\\\\[@$\\]" . font-lock-string-face) ; escaped $ @ \
("@{[^}]+}" . font-lock-builtin-face) ; @{}-variable references
("\\${[^}]+}" . font-lock-variable-name-face) ; ${}-variable references
("\"[^\"]*\"" 0 font-lock-string-face keep) ; double-quoted strings; escaped " not supported
("\\<\\(DEFAULT\\|OVERRIDE\\)=" . font-lock-keyword-face) ; DEFAULT= and OVERRIDE=
("^[^[:blank:]]+" . font-lock-variable-name-face) ; variable declarations
("[[:blank:]]+[^[:blank:]]+" . font-lock-warning-face)) ; stray whitespace
t nil ((?\' . "w") (?\" . "w")))
"Font lock settings for PAM-Environment mode. See `font-lock-defaults' for documentation.")
(define-derived-mode pam-env-mode prog-mode "PAM-Environment"
"PAM-environment mode is used for pam_env.conf(5) files."
(set (make-local-variable 'comment-start) "#")
(set (make-local-variable 'comment-start-skip) "^#+[[:blank:]]*")
(set (make-local-variable 'comment-end) "")
(set (make-local-variable 'font-lock-defaults) pam-env-mode/font-lock-defaults))
(let ((regexp "\\(\\`\\|/\\)\\(pam_env\\.conf\\|\\.pam_environment\\)\\'"))
(add-to-list 'auto-mode-alist `(,regexp . pam-env-mode)))
(provide 'pam-env-mode)
;;; pam-env.el ends here
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