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;;; titlecase.el --- title-case phrases -*- lexical-binding: t; -*-
;;; Commentary:
;; adapted from https://hungyi.net/posts/programmers-way-to-title-case/
;;; Code:
(require 'seq)
(defgroup titlecase nil
"Customizations for titlecasing phrases."
:prefix "titlecase-"
:group 'text)
;;; Lists of words /never/ to capitalize
(defvar titlecase-prepositions
'("'thout" "'tween" "aboard" "about" "above"
"abreast" "absent" "abt." "across" "after" "against" "ago" "aloft" "along"
"alongside" "amid" "amidst" "among" "amongst" "anti" "apart" "apropos"
"around" "as" "aside" "aslant" "astride" "at" "atop" "away" "before"
"behind" "below" "beneath" "beside" "besides" "between" "beyond" "but" "by"
"c." "ca." "circa" "come" "concerning" "contra" "counting" "cum" "despite"
"down" "during" "effective" "ere" "except" "excepting" "excluding" "failing"
"following" "for" "from" "hence" "in" "including" "inside" "into" "less"
"like" "mid" "midst" "minus" "mod" "modulo" "near" "nearer" "nearest"
"neath" "next" "notwithstanding" "o'" "o'er" "of" "off" "offshore" "on"
"onto" "ontop" "opposite" "out" "outside" "over" "pace" "past" "pending"
"per" "plus" "post" "pre" "pro" "qua" "re" "regarding" "respecting" "round"
"sans" "save" "saving" "short" "since" "sub" "t'" "than" "through"
"throughout" "thru" "thruout" "till" "times" "to" "toward" "towards" "under"
"underneath" "unlike" "until" "unto" "up" "upon" "v." "versus" "via"
"vis-à-vis" "vs." "w." "w/" "w/i" "w/o" "wanting" "with" "within"
"without")
"List of prepositions in English.
This list is, by necessity, incomplete, even though prepositions
are a closed lexical group in the English language. This list
was pulled and culled from
https://en.wikipedia.org/wiki/List_of_English_prepositions.")
(defvar titlecase-articles '("a" "an" "the")
"List of articles in English.")
(defvar titlecase-coordinating-conjunctions '("for" "and" "nor" "but" "or"
"yet" "so")
"List of coordinating conjunctions in English.")
(defvar titlecase-lowercase-chicago (append titlecase-articles
titlecase-prepositions
titlecase-coordinating-conjunctions)
"Words to lowercase in Chicago Style.
Include: articles, coordinating conjunctions, prepositions, and
\"to\" in an infinitive (though that's caught as a preposition).")
(defvar titlecase-lowercase-apa (append titlecase-articles
(seq-filter (lambda (p)
(< (length p) 4))
titlecase-prepositions))
"Words to lowercase in APA Style.")
(defvar titlecase-lowercase-mla (append titlecase-articles
titlecase-prepositions
titlecase-coordinating-conjunctions)
"Words to lowercase in MLA Style.")
(defvar titlecase-lowercase-ap (append titlecase-articles
(seq-filter (lambda (p)
(< (length p) 4))
titlecase-prepositions)
(seq-filter
(lambda (p)
(< (length p) 4))
titlecase-coordinating-conjunctions))
"Words to lowercase in AP Style.")
(defvar titlecase-lowercase-bluebook (append titlecase-articles
titlecase-coordinating-conjunctions
(seq-filter
(lambda (p)
(< (length p) 4))
titlecase-prepositions))
"Words to lowercase in Bluebook Style.")
(defvar titlecase-lowercase-ama (append titlecase-articles
titlecase-coordinating-conjunctions
(seq-filter (lambda (p)
(< (length p) 4))
titlecase-prepositions))
"Words to lowercase in AMA Style.")
(defvar titlecase-lowercase-nyt (append titlecase-articles
titlecase-prepositions
titlecase-coordinating-conjunctions)
"Words to lowercase in New York Times Style.")
(defvar titlecase-lowercase-wikipedia
(append titlecase-articles
(seq-filter (lambda (p) (< (length p) 5)) titlecase-prepositions)
titlecase-coordinating-conjunctions)
"Words to lowercase in Wikipedia Style.")
(defcustom titlecase-style 'chicago
"Which style to use when titlecasing."
:type '(choice (const :tag "Chicago Style" chicago)
(const :tag "APA Style" apa)
(const :tag "MLA Style" mla)
(const :tag "AP Style" ap)
(const :tag "Bluebook Style" bluebook)
(const :tag "AMA Style" ama)
(const :tag "New York Times Style" nyt)
(const :tag "Wikipedia Style" wikipedia)))
(defun titlecase--normalize (begin end)
"Normalize region from BEGIN to END."
(goto-char begin)
(unless (re-search-forward "[a-z]" end :noerror)
(downcase-region begin end)))
(defun titlecase--capitalize-first-word (begin end)
"Capitalize the first word of region from BEGIN to END."
(goto-char begin)
(capitalize-word 1))
(defun titlecase--capitalize-last-word (begin end)
"Capitalize the last word of region from BEGIN to END."
(goto-char end)
(backward-word 1)
(when (and (>= (point) begin))
(capitalize-word 1)))
(defun titlecase-region-with-style (begin end style)
"Titlecase the region of English text from BEGIN to END, using STYLE."
(interactive "*r")
(save-excursion
(goto-char begin)
;; If the region is in ALL-CAPS, normalize it first
(unless (re-search-forward "[a-z]" end :noerror)
(downcase-region begin end))
(goto-char begin) ; gotta go back to the beginning
(let (;; Constants during this function's runtime
(case-fold-search nil)
(downcase-word-list (symbol-value
(intern (format "titlecase-lowercase-%s"
style))))
;; State variables
(this-word (current-word))
(force-capitalize t))
;; And loop over the rest
(while (< (point) end)
(setq this-word (current-word))
(cond
;; Skip ALL-CAPS words
((string-match "^[A-Z]+$" this-word) (forward-word 1))
;; Force capitalization if `force-capitalize' is t
(force-capitalize (progn (capitalize-word 1)
(setq force-capitalize nil)))
;; Special rules for different styles
((and (memq style '(ap))
(> (length this-word) 3))
(capitalize-word 1))
;; Downcase words that should be
((member (downcase this-word) downcase-word-list)
(downcase-word 1))
;; Otherwise, capitalize the word
(t (capitalize-word 1)))
;; If the word ends with a :, ., ?, newline, or carriage-return, force
;; the next word to be capitalized.
(when (looking-at "[:.?;\n\r]")
(setq force-capitalize t))
(skip-syntax-forward "^w" end))
;; Capitalize the last word, only in some styles
(when (memq style '(chicago ap bluebook ama nyt wikipedia))
(backward-word 1)
(when (and (>= (point) begin))
(capitalize-word 1))))))
;;;###autoload
(defun titlecase-region (begin end)
"Titlecase the region of English text from BEGIN to END.
Uses the style provided in `titlecase-style'."
(interactive "*r")
(titlecase-region-with-style begin end titlecase-style))
;;;###autoload
(defun titlecase-dwim ()
"Titlecase either the region, if active, or the current line."
(interactive)
(if (region-active-p)
(titlecase-region (region-beginning) (region-end))
(titlecase-region (point-at-bol) (point-at-eol))))
(provide 'titlecase)
;;; titlecase.el ends here
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