From 3e9fc52f45876f5568a87313de8afde35f8bfda5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Maniaci?= <stephane.maniaci@gmail.com>
Date: Fri, 28 Dec 2018 14:16:12 +0100
Subject: [PATCH] Add nov-search-forward and nov-search-backwards

---
 README.rst |  1 +
 nov.el     | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/README.rst b/README.rst
index 982bd29..d9b1a2d 100644
--- a/README.rst
+++ b/README.rst
@@ -13,6 +13,7 @@ Features:
 - Basic navigation (jump to TOC, previous/next chapter)
 - Remembering and restoring the last read position
 - Jump to next chapter when scrolling beyond end
+- Search backward and forward
 - Renders EPUB2 (.ncx) and EPUB3 (<nav>) TOCs
 - Hyperlinks to internal and external targets
 - Supports textual and image documents
diff --git a/nov.el b/nov.el
index 432acda..cd084c4 100644
--- a/nov.el
+++ b/nov.el
@@ -376,6 +376,8 @@ Each alist item consists of the identifier and full path."
     (define-key map (kbd "]") 'nov-next-document)
     (define-key map (kbd "p") 'nov-previous-document)
     (define-key map (kbd "[") 'nov-previous-document)
+    (define-key map (kbd "s") 'nov-search-forward)
+    (define-key map (kbd "b") 'nov-search-backward)
     (define-key map (kbd "t") 'nov-goto-toc)
     (define-key map (kbd "RET") 'nov-browse-url)
     (define-key map (kbd "<follow-link>") 'mouse-face)
@@ -663,6 +665,40 @@ Saving is only done if `nov-save-place-file' is set."
        (>= index 0)
        (< index (length documents))))
 
+(defun nov--search-direction (query direction)
+  "Search document for QUERY in the specified DIRECTION.  DIRECTION should be either :forward or :backward."
+  (cl-multiple-value-setq (search-fn next-page-fn buffer-edge-fn)
+    (or (and (eq direction :forward)
+	     '(search-forward
+	       nov-next-document
+	       beginning-of-buffer))
+	'(search-backward
+	  nov-previous-document
+	  end-of-buffer)))
+  (lexical-let* ((original-index nov-documents-index)
+		 (original-point (point))
+		 (found (funcall search-fn query nil t)))
+    (while (and
+	    (not found)
+	    (funcall next-page-fn))
+      (funcall buffer-edge-fn)
+      (setf found (funcall search-fn query nil t)))
+    (unless found
+      (setf nov-documents-index original-index)
+      (nov-render-document)
+      (setf (point) original-point)
+      (message "No match found for %s." query))))
+
+(defun nov-search-backward (query)
+  "Search the document backward for QUERY."
+  (interactive "sSearch query backward: ")
+  (nov--search-direction query :backward))
+
+(defun nov-search-forward (query)
+  "Search the document forward for QUERY."
+  (interactive "sSearch query: ")
+  (nov--search-direction query :forward))
+
 ;;;###autoload
 (define-derived-mode nov-mode special-mode "EPUB"
   "Major mode for reading EPUB documents"