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;;; bibtex-style.el --- Major mode for BibTeX Style files -*- lexical-binding: t -*-
;; Copyright (C) 2005, 2007-2025 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: tex
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Done: font-lock, imenu, outline, commenting, indentation.
;; Todo: tab-completion.
;;; Code:
(defvar bibtex-style-mode-syntax-table
(let ((st (make-syntax-table)))
(modify-syntax-entry ?% "<" st)
(modify-syntax-entry ?\n ">" st)
(modify-syntax-entry ?\{ "(}" st)
(modify-syntax-entry ?\} "){" st)
(modify-syntax-entry ?\" "\"" st)
(modify-syntax-entry ?. "_" st)
(modify-syntax-entry ?' "'" st)
(modify-syntax-entry ?# "'" st)
(modify-syntax-entry ?* "." st)
(modify-syntax-entry ?= "." st)
(modify-syntax-entry ?$ "_" st)
st))
(defconst bibtex-style-commands
'("ENTRY" "EXECUTE" "FUNCTION" "INTEGERS" "ITERATE" "MACRO" "READ"
"REVERSE" "SORT" "STRINGS"))
(defconst bibtex-style-functions
;; From https://www.eeng.dcu.ie/local-docs/btxdocs/btxhak/btxhak/node4.html.
'("<" ">" "=" "+" "-" "*" ":="
"add.period$" "call.type$" "change.case$" "chr.to.int$" "cite$"
"duplicate$" "empty$" "format.name$" "if$" "int.to.chr$" "int.to.str$"
"missing$" "newline$" "num.names$" "pop$" "preamble$" "purify$" "quote$"
"skip$" "stack$" "substring$" "swap$" "text.length$" "text.prefix$"
"top$" "type$" "warning$" "while$" "width$" "write$"))
(defvar bibtex-style-font-lock-keywords
`((,(regexp-opt bibtex-style-commands 'words) . font-lock-keyword-face)
("\\w+\\$" . font-lock-keyword-face)
("\\<\\(FUNCTION\\|MACRO\\)\\s-+{\\([^}\n]+\\)}"
(2 font-lock-function-name-face))))
;;;###autoload
(define-derived-mode bibtex-style-mode nil "BibStyle"
"Major mode for editing BibTeX style files."
(setq-local comment-start "%")
(setq-local outline-regexp "^[a-z]")
(setq-local imenu-generic-expression
'((nil "\\<\\(FUNCTION\\|MACRO\\)\\s-+{\\([^}\n]+\\)}" 2)))
(setq-local indent-line-function #'bibtex-style-indent-line)
(setq-local parse-sexp-ignore-comments t)
(setq font-lock-defaults
'(bibtex-style-font-lock-keywords nil t
((?. . "w")))))
(defun bibtex-style-indent-line ()
"Indent current line of BibTeX Style code."
(interactive)
(let* ((savep (point))
(indent (condition-case nil
(save-excursion
(forward-line 0)
(skip-chars-forward " \t")
(if (>= (point) savep) (setq savep nil))
(max (bibtex-style-calculate-indentation) 0))
(error 0))))
(if savep
(save-excursion (indent-line-to indent))
(indent-line-to indent))))
(defcustom bibtex-style-indent-basic 2
"Basic amount of indentation to use in BibTeX Style mode."
:version "22.2"
:type 'integer
:group 'bibtex)
(defun bibtex-style-calculate-indentation (&optional virt)
(or
;; Stick the first line at column 0.
(and (= (point-min) (line-beginning-position)) 0)
;; Commands start at column 0.
(and (looking-at (regexp-opt bibtex-style-commands 'words)) 0)
;; Trust the current indentation, if such info is applicable.
(and virt (save-excursion (skip-chars-backward " \t{") (bolp))
(current-column))
;; Put leading close-paren where the matching open brace would be.
(and (looking-at "}")
(condition-case nil
(save-excursion
(up-list -1)
(bibtex-style-calculate-indentation 'virt))
(scan-error nil)))
;; Align leading "if$" with previous command.
(and (looking-at "if\\$")
(condition-case nil
(save-excursion
(backward-sexp 3)
(bibtex-style-calculate-indentation 'virt))
(scan-error
;; There is no command before the "if$".
(condition-case nil
(save-excursion
(up-list -1)
(+ bibtex-style-indent-basic
(bibtex-style-calculate-indentation 'virt)))
(scan-error nil)))))
;; Right after an opening brace.
(condition-case err (save-excursion (backward-sexp 1) nil)
(scan-error (goto-char (nth 2 err))
(+ bibtex-style-indent-basic
(bibtex-style-calculate-indentation 'virt))))
;; Default, align with previous command.
(let ((fai ;; First arm of an "if$".
(condition-case nil
(save-excursion
(forward-sexp 2)
(forward-comment (point-max))
(looking-at "if\\$"))
(scan-error nil))))
(save-excursion
(condition-case nil
(while (progn
(backward-sexp 1)
(save-excursion (skip-chars-backward " \t{") (not (bolp)))))
(scan-error nil))
(+ (current-column)
(if (or fai (looking-at "ENTRY")) bibtex-style-indent-basic 0))))))
(provide 'bibtex-style)
;;; bibtex-style.el ends here
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