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+;;; simple-modeline-core.el --- The core libraries for simple-modeline -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019-2021  Eder Elorriaga
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; The core libraries for simple-modeline.
+
+;;; Code:
+
+(defgroup simple-modeline nil
+  "A simple mode line."
+  :prefix "simple-modeline-"
+  :group 'mode-line)
+
+(defvar simple-modeline--default-mode-line mode-line-format
+  "The former value of `mode-line-format'.")
+
+;;
+;; Options
+;;
+
+(defcustom simple-modeline-segments
+  '((simple-modeline-segment-modified
+     simple-modeline-segment-buffer-name)
+    (simple-modeline-segment-vc
+     simple-modeline-segment-major-mode))
+  "Simple modeline segments."
+  :type '(list (repeat :tag "Left aligned" function)
+               (repeat :tag "Right aligned" function))
+  :package-version '(simple-modeline . "1.2"))
+
+;;
+;; Faces
+;;
+
+(defface simple-modeline-space
+  '((t))
+  "Face for space used to alight the right segments in the mode-line.")
+
+(defface simple-modeline-unimportant
+  '((t (:inherit (shadow))))
+  "Face for less important mode-line elements.")
+
+(defface simple-modeline-status-modified
+  '((t (:inherit (font-lock-variable-name-face))))
+  "Face for the 'modified' indicator symbol in the mode-line.")
+
+(defface simple-modeline-status-info
+  '((t (:inherit (font-lock-string-face))))
+  "Face for generic status indicators in the mode-line.")
+
+(defface simple-modeline-status-success
+  '((t (:inherit (success))))
+  "Face used for success status indicators in the mode-line.")
+
+(defface simple-modeline-status-warning
+  '((t (:inherit (warning))))
+  "Face for warning status indicators in the mode-line.")
+
+(defface simple-modeline-status-error
+  '((t (:inherit (error))))
+  "Face for error status indicators in the mode-line.")
+
+;;
+;; Helpers
+;;
+
+(defun simple-modeline--format (left-segments right-segments)
+  "Return a string of `window-width' length containing LEFT-SEGMENTS and RIGHT-SEGMENTS, aligned respectively."
+  (let* ((left (simple-modeline--format-segments left-segments))
+         (right (simple-modeline--format-segments right-segments))
+         (reserve (length right)))
+    (concat
+     left
+     (propertize " "
+                 'display `((space :align-to (- right ,reserve)))
+                 'face '(:inherit simple-modeline-space))
+     right)))
+
+(defun simple-modeline--format-segments (segments)
+  "Return a string from a list of SEGMENTS."
+  (format-mode-line (mapcar
+                     (lambda (segment)
+                       `(:eval (,segment)))
+                     segments)))
+
+(provide 'simple-modeline-core)
+;;; simple-modeline-core.el ends here