From 0a34ba8d6f769b730ab3bbf444bfc0b4756e5426 Mon Sep 17 00:00:00 2001
From: Kyle Meyer <kyle@kyleam.com>
Date: Wed, 29 Jan 2014 17:47:42 -0500
Subject: Add LaTeX narrowing functions

---
 lisp/init-tex.el | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to 'lisp')

diff --git a/lisp/init-tex.el b/lisp/init-tex.el
index 10539c0..b2f4d0f 100644
--- a/lisp/init-tex.el
+++ b/lisp/init-tex.el
@@ -15,4 +15,50 @@
 
 (setq reftex-default-bibliography '("~/refs/refs.bib"))
 
+(defun km/latex-narrow-to-single-tag (&optional tag)
+  "Narrow region to LaTeX tag.
+This is meant for single elements, like \"\\section\". If TAG is
+not given, it is taken from the active region."
+  (interactive)
+  (save-excursion
+    (let* ((tag (or tag
+                (buffer-substring-no-properties (mark) (point))))
+           (tag (if (s-starts-with? "\\" tag)
+                    tag
+                  (concat "\\" tag)))
+           (beg (progn (end-of-line)
+                       (search-backward tag)))
+           (end (progn (forward-line 1)
+                       (unless (search-forward tag nil t)
+                         (search-forward "\\end{document}"))
+                       (forward-line -1)
+                       (point))))
+      (narrow-to-region beg end))))
+
+(defun km/latex-narrow-to-paired-tag (&optional tag)
+  "Narrow region to LaTeX tag.
+This is meant for paired, like \"\\begin{document}\". If TAG is
+not given, it is taken from the active region."
+  (interactive)
+  (save-excursion
+    (let* ((tag (or tag
+                (buffer-substring-no-properties (mark) (point))))
+           (beg (progn (end-of-line)
+                       (search-backward (format "\\begin{%s}" tag))))
+           (end (progn (forward-line 1)
+                       (search-forward (format "\\end{%s}" tag)))))
+      (narrow-to-region beg end))))
+
+(defun km/latex-narrow-to-document ()
+  "Narrow region to LaTeX document text.
+The point should be beyond \"\\begin{document}\"."
+  (interactive)
+  (km/latex-narrow-to-paired-tag "document"))
+
+(defun km/latex-narrow-to-section ()
+  "Narrow region to current LaTeX section.
+The point should be beyond \"\\section\"."
+  (interactive)
+  (km/latex-narrow-to-single-tag "section"))
+
 (provide 'init-tex)
-- 
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