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;;; build-nerd-icons-legend.el --- emit nerd-icons filetype legend for theme-studio -*- lexical-binding: t -*-
;;; Commentary:
;; Loaded into a running Emacs (emacsclient -e '(load ".../build-nerd-icons-legend.el")')
;; to write nerd-icons-legend.json next to itself: the curated v1 filetype legend
;; for theme-studio's bespoke nerd-icons preview. Each row resolves its glyph and
;; owner color face from the live nerd-icons alists at capture time, so the legend
;; tracks the installed nerd-icons version. A curated key absent from the alist
;; is skipped and logged. generate.py embeds the JSON; see
;; docs/specs/theme-studio-nerd-icons-colors-spec.org.
;;; Code:
(require 'json)
(require 'nerd-icons)
;; Curated v1 rows: (KEY LABEL CATEGORY LOOKUP). CATEGORY selects the source
;; alist and its face shape; LOOKUP is the alist key (nil for the dir row, which
;; has a fixed owner face per the spec's dir-precedence decision).
(defconst cj/--nerd-icons-legend-spec
'(("ext:el" "init.el" extension "el")
("ext:py" "app.py" extension "py")
("ext:org" "notes.org" extension "org")
("ext:md" "README.md" extension "md")
("ext:ts" "main.ts" extension "ts")
("ext:html" "index.html" extension "html")
("ext:rs" "lib.rs" extension "rs")
("ext:js" "app.js" extension "js")
("ext:yml" "ci.yml" extension "yml")
("ext:c" "main.c" extension "c")
("dir" "src/" dir nil)
("cmd" "M-x command" command command)
("buf" "*scratch*" buffer emacs-lisp-mode))
"The v1 legend rows: (KEY LABEL CATEGORY LOOKUP), spanning a representative
set of the nerd-icons color faces rather than all 34.")
(defun cj/--nerd-icons-legend-glyph (fn name)
"Return the bare glyph string for icon NAME drawn by FN, or nil."
(when (and (fboundp fn) (stringp name))
(let ((s (ignore-errors (funcall fn name))))
(and (stringp s)
(> (length (string-trim s)) 0)
(string-trim (substring-no-properties s))))))
(defun cj/--nerd-icons-legend-make (key label category glyph face)
"Build the JSON alist for one legend row, or nil (logged) when GLYPH/FACE missing."
(if (and glyph face)
(list (cons "key" key)
(cons "label" label)
(cons "face" (symbol-name face))
(cons "category" (symbol-name category))
(cons "glyph" glyph))
(message "nerd-icons-legend: skipping %s (glyph=%S face=%S)" key glyph face)
nil))
(defun cj/--nerd-icons-legend-row (key label category lookup)
"Resolve one curated row from the live nerd-icons alists, or nil if absent."
(pcase category
('extension
(let ((e (assoc lookup nerd-icons-extension-icon-alist)))
(when e
(cj/--nerd-icons-legend-make
key label category
(cj/--nerd-icons-legend-glyph (nth 1 e) (nth 2 e))
(plist-get (nthcdr 3 e) :face)))))
('buffer
(let ((e (assq lookup nerd-icons-mode-icon-alist)))
(when e
(cj/--nerd-icons-legend-make
key label category
(cj/--nerd-icons-legend-glyph (nth 1 e) (nth 2 e))
(plist-get (nthcdr 3 e) :face)))))
('command
(let ((e (assq lookup nerd-icons-completion-category-icons)))
(when e
(cj/--nerd-icons-legend-make
key label category
(cj/--nerd-icons-legend-glyph (nth 1 e) (nth 2 e))
(nth 3 e)))))
('dir
(cj/--nerd-icons-legend-make
key label category
(let ((s (ignore-errors (nerd-icons-icon-for-dir "src"))))
(and (stringp s) (string-trim (substring-no-properties s))))
'nerd-icons-yellow))))
(let ((rows (delq nil (mapcar (lambda (r) (apply #'cj/--nerd-icons-legend-row r))
cj/--nerd-icons-legend-spec))))
(with-temp-file (expand-file-name
"nerd-icons-legend.json"
(file-name-directory (or load-file-name buffer-file-name
"~/.emacs.d/scripts/theme-studio/")))
(let ((json-encoding-pretty-print t))
(insert (json-encode (apply #'vector rows)) "\n")))
(message "nerd-icons-legend: wrote %d rows" (length rows)))
(provide 'build-nerd-icons-legend)
;;; build-nerd-icons-legend.el ends here
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