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;;; my-mode-line.el --- Custom mode-line on top of mode-line-maker -*- lexical-binding: t; -*-
(require 'mode-line-maker)
(defface my/mode-line-helix-normal
'((t (:background "#89b4fa" :foreground "#1e1e2e" :weight bold)))
"Face for the helix normal state indicator.")
(defface my/mode-line-helix-insert
'((t (:background "#a6e3a1" :foreground "#1e1e2e" :weight bold)))
"Face for the helix insert state indicator.")
(defface my/mode-line-irc-face
'((t (:foreground "#94e2d5" :weight bold)))
"Face for the IRC activity indicator.")
(defface my/mode-line-mu4e-face
'((t (:foreground "#f9e2af" :weight bold)))
"Face for the unread mail indicator.")
(defface my/mode-line-time-face
'((t (:foreground "#89dceb")))
"Face for the time segment.")
(defface my/mode-line-state-saved-face
'((t (:foreground "#a6e3a1")))
"Face for the saved buffer state icon.")
(defface my/mode-line-state-modified-face
'((t (:foreground "#fab387" :weight bold)))
"Face for the modified buffer state icon.")
(defface my/mode-line-state-read-only-face
'((t (:foreground "#f38ba8")))
"Face for the read-only buffer state icon.")
(defvar-local my/mode-line--buffer-title nil)
(defun my/mode-line--update-title-cache ()
"Update the cached #+title for the current buffer."
(setq-local my/mode-line--buffer-title
(and (derived-mode-p 'org-mode)
(cadar (org-collect-keywords '("TITLE"))))))
(defun my/mode-line--buffer-title ()
"Return the cached #+title, computing it if necessary."
(unless (local-variable-p 'my/mode-line--buffer-title)
(my/mode-line--update-title-cache))
my/mode-line--buffer-title)
(defun my/mode-line--invalidate-title-cache ()
"Invalidate the cached title so it gets recomputed on next update."
(kill-local-variable 'my/mode-line--buffer-title))
(defun my/mode-line-buffer-name ()
"Buffer name for the mode line.
Uses the Org #+title if present, otherwise the file path relative to
the project root, falling back to the plain buffer name."
(or (my/mode-line--buffer-title)
(if-let* ((file buffer-file-name)
(project (project-current))
(root (project-root project)))
(file-relative-name file root)
(buffer-name))))
(defun my/mode-line--nerd-icons-p ()
(and (bound-and-true-p ek-use-nerd-fonts)
(require 'nerd-icons nil t)))
(defun my/mode-line-buffer-icon ()
"Nerd icon for the current buffer, or nil."
(when (my/mode-line--nerd-icons-p)
(or (and buffer-file-name
(ignore-errors (nerd-icons-icon-for-file buffer-file-name)))
(ignore-errors (nerd-icons-icon-for-mode major-mode)))))
(defun my/mode-line-helix-state ()
"Colored single-letter indicator for the current helix state."
(when (and (boundp 'helix--current-state) helix--current-state)
(let* ((tag (upcase (substring (symbol-name helix--current-state) 0 1)))
(face (intern-soft (format "my/mode-line-helix-%s" helix--current-state))))
(propertize (format " %s " tag) 'face (or face 'my/mode-line-helix-normal)))))
(defun my/mode-line-buffer-state ()
"Buffer state icon: lock (read-only), pencil-alert (modified), save (saved)."
(cond
(buffer-read-only
(if (my/mode-line--nerd-icons-p)
(propertize (nerd-icons-mdicon "nf-md-lock")
'face 'my/mode-line-state-read-only-face)
"%%"))
((buffer-modified-p)
(if (my/mode-line--nerd-icons-p)
(propertize (nerd-icons-mdicon "nf-md-content_save_alert")
'face 'my/mode-line-state-modified-face)
"**"))
(t
(if (my/mode-line--nerd-icons-p)
(propertize (nerd-icons-mdicon "nf-md-content_save")
'face 'my/mode-line-state-saved-face)
"--"))))
(defun my/mode-line-irc ()
"IRC activity indicator: icon plus number of buffers with unread activity."
(when (bound-and-true-p erc-modified-channels-alist)
(let ((icon (and (my/mode-line--nerd-icons-p)
(nerd-icons-mdicon "nf-md-message_badge_outline"))))
(propertize (format "%s %d" (or icon "irc")
(length erc-modified-channels-alist))
'face 'my/mode-line-irc-face))))
(defun my/mode-line-mu4e ()
"Unread mail indicator from mu4e-alert, or nil when mu4e is not in use."
(when (bound-and-true-p mu4e-alert-mode-line)
(let ((icon (and (my/mode-line--nerd-icons-p)
(nerd-icons-mdicon "nf-md-email_alert_outline"))))
(propertize (format "%s %s" (or icon "mail")
(string-trim mu4e-alert-mode-line))
'face 'my/mode-line-mu4e-face))))
(defvar my/mode-line--clock-icons
["nf-md-clock_time_twelve" "nf-md-clock_time_one" "nf-md-clock_time_two"
"nf-md-clock_time_three" "nf-md-clock_time_four" "nf-md-clock_time_five"
"nf-md-clock_time_six" "nf-md-clock_time_seven" "nf-md-clock_time_eight"
"nf-md-clock_time_nine" "nf-md-clock_time_ten" "nf-md-clock_time_eleven"]
"Nerd icon clock faces indexed by hour modulo 12.")
(defun my/mode-line-time ()
"Time with a live clock icon showing the current hour."
(when (bound-and-true-p display-time-string)
(let* ((hour (% (string-to-number (format-time-string "%I")) 12))
(icon (and (my/mode-line--nerd-icons-p)
(nerd-icons-mdicon (aref my/mode-line--clock-icons hour))))
(time (string-trim display-time-string)))
(propertize (if icon (concat icon " " time) time)
'face 'my/mode-line-time-face))))
(defun my/mode-line-install ()
"Install the custom mode-line built with mode-line-maker.
The mode-line lives at the top of the window via `header-line-format';
the bottom mode-line is hidden."
(setq global-mode-string (delq 'display-time-string global-mode-string))
(setq-default mode-line-format nil)
(setq-default header-line-format
(mode-line-maker
'((:eval (my/mode-line-helix-state)) " "
(:eval (my/mode-line-buffer-state)) mode-line-remote " "
(:eval (my/mode-line-buffer-icon)) " "
(:eval (propertize (my/mode-line-buffer-name)
'face 'mode-line-buffer-id
'mouse-face 'mode-line-highlight
'help-echo (concat (or buffer-file-truename (buffer-name))
"\nmouse-1: Previous buffer\nmouse-3: Next buffer")
'local-map mode-line-buffer-identification-keymap)) " "
mode-line-position)
'("" (:eval (my/mode-line-irc)) " "
(:eval (my/mode-line-mu4e)) " "
mode-line-process " "
(:eval (my/mode-line-time)) " "
mode-name " ")))
(add-hook 'before-save-hook #'my/mode-line--invalidate-title-cache))
(provide 'my-mode-line)
;;; my-mode-line.el ends here
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