[elpa] externals/osm ad12c93f57 01/77: Initial commit

[ELPA Syncer]

branch: externals/osm
commit ad12c93f577723865a5a0135336d1ed5dbd38639
Author: Daniel Mendler <mail@daniel-mendler.de>
Commit: Daniel Mendler <mail@daniel-mendler.de>

    Initial commit
---
 LICENSE    | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.org |  59 ++++++
 ol-osm.el  |  54 +++++
 osm.el     | 521 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 1308 insertions(+)

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000..94a9ed024d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.org b/README.org
new file mode 100644
index 0000000000..9e66c6efde
--- /dev/null
+++ b/README.org
@@ -0,0 +1,59 @@
+#+title: osm.el - OpenStreetMap viewer for Emacs
+#+author: Daniel Mendler
+#+language: en
+#+export_file_name: osm.texi
+#+texinfo_dir_category: Emacs
+#+texinfo_dir_title: OpenStreetMap: (osm).
+#+texinfo_dir_desc: OpenStreetMap viewer for Emacs
+
+#+html: <a href="https://www.gnu.org/software/emacs/";><img alt="GNU Emacs" 
src="https://github.com/minad/corfu/blob/screenshots/emacs.svg?raw=true"/></a>
+
+[[https://github.com/minad/osm/blob/screenshots/osm.png?raw=true]]
+(Map tiles © https://opentopomap.org,  https://openstreetmap.org)
+
+* Features
+
+- Parallel fetching of tiles via curl
+- Scrolling in large and small steps
+- Zooming
+- Map scale indicator
+- Jump to coordinate
+- Search for location by name
+- Org link support (Example: [[osm:44,10,6][Toscana, Italia 44° 10°]])
+- Bookmarks
+
+* Commands and Key Bindings
+
+Commands:
+- =osm-new=: Open new map at home coordinates
+- =osm-search=: Search and jump to location
+- =osm-goto=: Go to coordinates
+
+Key bindings:
+- ~+~ and ~-~: Zooming
+- ~<arrow>~: Small step scrolling
+- ~C-<arrow>~, ~M-<arrow>~: Large step scrolling
+- ~g~: =osm-goto=
+- ~s~: =osm-search=
+- ~b~: =bookmark-set=
+- ~B~: =bookmark-jump=
+- ~q~: =quit-window=
+- ~c~: =clone-buffer=
+
+* Wishlist
+
+It would be nice to have overlays on top of the map, location markers, routes,
+GPS tracks, etc. Emacs does not have the ability to place different images on
+top of each other, except via SVG. Therefore this requires us to use SVG tiles
+instead of the current PNG tiles. The PNG tiles can be used as backgrounds of
+the corresponding SVG tiles. Alternatively don't use SVG tiles but render
+everything as one large SVG or off load the entire map rendering to an external
+Image Magick process. Maybe that's still efficient enough?
+
+* Related projects
+
+There have been other attempts at map viewers in Emacs before.
+
+- https://github.com/ruediger/osm-mode
+- https://github.com/svenssonjoel/Emacs-OSM
+- https://github.com/jd/google-maps.el
diff --git a/ol-osm.el b/ol-osm.el
new file mode 100644
index 0000000000..7baace2e8d
--- /dev/null
+++ b/ol-osm.el
@@ -0,0 +1,54 @@
+;;; ol-osm.el --- Org links for `osm-mode' -*- lexical-binding: t -*-
+
+;; Copyright (C) 2022 Daniel Mendler
+
+;; This file is not part of GNU Emacs.
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org links for `osm-mode'.
+
+;;; Code:
+
+(require 'ol)
+
+;; Only load osm on demand
+(autoload 'osm-goto "osm")
+(declare-function osm--link-data "osm")
+
+(org-link-set-parameters
+ "osm"
+ :follow #'ol-osm-open
+ :store #'ol-osm-store)
+
+(defun ol-osm-open (link _)
+  "Open osm LINK."
+  (setq link (split-string link ","))
+  (osm-goto (string-to-number (nth 0 link))
+             (string-to-number (nth 1 link))
+             (string-to-number (nth 2 link))))
+
+(defun ol-osm-store ()
+  "Store osm link."
+  (when (derived-mode-p 'osm-mode)
+    (pcase-let ((`(,lat ,lon ,zoom ,desc) (osm--link-data)))
+      (org-link-store-props
+       :type "osm"
+       :description (and desc (format "%s %.2f° %.2f°" desc lat lon))
+       :link (format "osm:%s,%s,%s" lat lon zoom)))))
+
+(provide 'ol-osm)
+;;; ol-osm.el ends here
diff --git a/osm.el b/osm.el
new file mode 100644
index 0000000000..ff552647e6
--- /dev/null
+++ b/osm.el
@@ -0,0 +1,521 @@
+;;; osm.el --- OpenStreetMap viewer -*- lexical-binding: t -*-
+
+;; Copyright (C) 2022 Daniel Mendler
+
+;; Author: Daniel Mendler <mail@daniel-mendler.de>
+;; Created: 2022
+;; License: GPL-3.0-or-later
+;; Version: 0.1
+;; Package-Requires: ((emacs "27.1"))
+;; Homepage: https://github.com/minad/osm
+
+;; This file is not part of GNU Emacs.
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; OpenStreetMap viewer
+
+;;; Code:
+
+(require 'seq)
+(eval-when-compile (require 'cl-lib))
+
+(defgroup osm nil
+  "OpenStreetMap."
+  :group 'network
+  :prefix "osm-")
+
+(defcustom osm-tile-server-list
+  '((openstreetmap-de
+     :url ("https://a.tile.openstreetmap.de/";
+           "https://b.tile.openstreetmap.de/";
+           "https://c.tile.openstreetmap.de/";)
+     :min-zoom 2 :max-zoom 19 :max-connections 2)
+    (openstreetmap-org
+     :url ("https://a.tile.openstreetmap.org/";
+           "https://b.tile.openstreetmap.org/";
+           "https://c.tile.openstreetmap.org/";)
+     :min-zoom 2 :max-zoom 19 :max-connections 2)
+    (opentopomap-org
+     :url ("https://a.tile.opentopomap.org/";
+           "https://b.tile.opentopomap.org/";
+           "https://c.tile.opentopomap.org/";)
+     :min-zoom 2 :max-zoom 17 :max-connections 2))
+  "List of tile servers."
+  :type '(alist :key-type symbol :value-type plist))
+
+(defcustom osm-large-step 256
+  "Movement step in pixel."
+  :type 'integer)
+
+(defcustom osm-small-step 16
+  "Movement step in pixel."
+  :type 'integer)
+
+(defcustom osm-tile-server 'openstreetmap-org
+  "Tile server name."
+  :type 'symbol)
+
+(defcustom osm-tile-cache (file-name-concat user-emacs-directory "var/osm/")
+  "Tile cache directory."
+  :type 'string)
+
+(defconst osm--placeholder1
+  `(image :type xbm :width 256 :height 256 :background nil
+          :data ,(make-bool-vector (* 256 256) nil)))
+(defconst osm--placeholder2 (copy-sequence osm--placeholder1))
+
+(defvar osm--search-history nil)
+
+(defvar-local osm--url-index 0)
+(defvar-local osm--queue nil)
+(defvar-local osm--active nil)
+(defvar-local osm--width 0)
+(defvar-local osm--height 0)
+(defvar-local osm--zoom nil)
+(defvar-local osm--x nil)
+(defvar-local osm--y nil)
+
+(defun osm--bb-to-zoom (lat1 lat2 lon1 lon2)
+  "Compute zoom level from boundingbox LAT1 to LAT2 and LON1 to LON2."
+  (let ((w (/ (frame-pixel-width) 256))
+        (h (/ (frame-pixel-height) 256)))
+    (max (osm--server-property :min-zoom)
+         (min
+          (osm--server-property :max-zoom)
+          (min (logb (/ w (abs (- (osm--lon-to-x lon1) (osm--lon-to-x lon2)))))
+               (logb (/ h (abs (- (osm--lat-to-y lat1) (osm--lat-to-y 
lat2))))))))))
+
+(defun osm--lon-to-x (lon)
+  "Convert LON to x coordinate (unscaled)."
+  (/ (+ lon 180.0) 360.0))
+
+(defun osm--lat-to-y (lat)
+  "Convert LAT to y coordiate (unscaled)."
+  (setq lat (* lat (/ float-pi 180.0)))
+  (- 0.5 (/ (log (+ (tan lat) (/ 1 (cos lat)))) float-pi 2)))
+
+(defun osm--set-lat-lon (lat lon)
+  "Set longitude LON and latitude LAT."
+  (let ((n (* 256 (expt 2.0 osm--zoom))))
+    (setq osm--x (floor (* n (osm--lon-to-x lon)))
+          osm--y (floor (* n (osm--lat-to-y lat))))))
+
+(defun osm--lon ()
+  "Return longitude in degrees."
+  (- (/ (* osm--x 360.0) 256.0 (expt 2.0 osm--zoom)) 180.0))
+
+(defun osm--lat ()
+  "Return latitude in degrees."
+  (let ((y (* float-pi (- 1 (* 2 (/ osm--y 256.0 (expt 2.0 osm--zoom)))))))
+    (/ (* 180 (atan (/ (- (exp y) (exp (- y))) 2))) float-pi)))
+
+(defun osm--server-property (prop)
+  "Return server property PROP."
+  (plist-get (alist-get osm-tile-server osm-tile-server-list) prop))
+
+(defun osm--tile-url (x y zoom)
+  "Return tile url for coordinate X, Y and ZOOM."
+  (let ((url (osm--server-property :url)))
+    (prog1
+        (format "%s%d/%d/%d.png"
+                (nth osm--url-index url)
+                zoom x y)
+      (setq osm--url-index
+            (mod (1+ osm--url-index)
+                 (length url))))))
+
+(defun osm--tile-file (x y zoom)
+  "Return tile file name for coordinate X, Y and ZOOM."
+  (format "%s%d-%d-%d.png" (osm--tile-cache) zoom x y))
+
+(defun osm--tile-cache ()
+  "Return tile cache directory."
+  (expand-file-name
+   (file-name-concat osm-tile-cache
+                     (symbol-name osm-tile-server)
+                     "/")))
+
+(defun osm--enqueue (x y)
+  "Enqueue tile X/Y for download."
+  (let ((job `(,x ,y . ,osm--zoom)))
+    (unless (member job osm--queue)
+      (setq osm--queue (nconc osm--queue (list job))))))
+
+(defun osm--download ()
+  "Download next tile in queue."
+  (pcase (and (< (length osm--active)
+                 (* (length (osm--server-property :url))
+                    (osm--server-property :max-connections)))
+              (pop osm--queue))
+    (`(,x ,y . ,zoom)
+     (let ((buffer (current-buffer)))
+       (push
+        (make-process
+         :name (format "osm %s %s %s" x y zoom)
+         :connection-type 'pipe
+         :noquery t
+         :command
+         (list "curl" "-s" "-o"
+               (osm--tile-file x y zoom)
+               (osm--tile-url x y zoom))
+         :filter #'ignore
+         :sentinel
+         (lambda (proc status)
+           (when (buffer-live-p buffer)
+             (with-current-buffer buffer
+               (setq osm--active (delq proc osm--active))
+               (when (and (string-match-p "finished" status)
+                          (eq osm--zoom zoom))
+                 (osm--put x y))
+               (force-mode-line-update)
+               (osm--download)))))
+        osm--active)
+       (osm--download)))))
+
+(defun osm-larger (&optional n)
+  "Zoom N times into the map."
+  (interactive "p")
+  (setq n (or n 1))
+  (while (> n 0)
+    (when (< osm--zoom (osm--server-property :max-zoom))
+      (setq osm--zoom (1+ osm--zoom)
+            osm--x (* osm--x 2)
+            osm--y (* osm--y 2)))
+    (cl-decf n))
+  (while (< n 0)
+    (when (> osm--zoom (osm--server-property :min-zoom))
+      (setq osm--zoom (1- osm--zoom)
+            osm--x (/ osm--x 2)
+            osm--y (/ osm--y 2)))
+    (cl-incf n))
+  (osm--update))
+
+(defun osm-smaller (&optional n)
+  "Zoom N times out of the map."
+  (interactive "p")
+  (osm-larger (- (or n 1))))
+
+(defun osm--move (dx dy step)
+  "Move by DX/DY with STEP size."
+  (setq
+   osm--x (min (* 256 (1- (expt 2 osm--zoom)))
+               (max 0 (+ osm--x (* dx step))))
+   osm--y (min (* 256 (1- (expt 2 osm--zoom)))
+               (max 0 (+ osm--y (* dy step)))))
+  (osm--update))
+
+(defun osm-right (&optional n)
+  "Move N small stepz to the right."
+  (interactive "p")
+  (osm--move (or n 1) 0 osm-small-step))
+
+(defun osm-down (&optional n)
+  "Move N small stepz down."
+  (interactive "p")
+  (osm--move 0 (or n 1) osm-small-step))
+
+(defun osm-up (&optional n)
+  "Move N small stepz up."
+  (interactive "p")
+  (osm-down (- (or n 1))))
+
+(defun osm-left (&optional n)
+  "Move N small stepz to the left."
+  (interactive "p")
+  (osm-right (- (or n 1))))
+
+(defun osm-right-large (&optional n)
+  "Move N large stepz to the right."
+  (interactive "p")
+  (osm--move (or n 1) 0 osm-large-step))
+
+(defun osm-down-large (&optional n)
+  "Move N large stepz down."
+  (interactive "p")
+  (osm--move 0 (or n 1) osm-large-step))
+
+(defun osm-up-large (&optional n)
+  "Move N large stepz up."
+  (interactive "p")
+  (osm-down-large (- (or n 1))))
+
+(defun osm-left-large (&optional n)
+  "Move N large stepz to the left."
+  (interactive "p")
+  (osm-right-large (- (or n 1))))
+
+(defvar osm-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map "+" #'osm-larger)
+    (define-key map "-" #'osm-smaller)
+    (define-key map [up] #'osm-up)
+    (define-key map [down] #'osm-down)
+    (define-key map [left] #'osm-left)
+    (define-key map [right] #'osm-right)
+    (define-key map [C-up] #'osm-up-large)
+    (define-key map [C-down] #'osm-down-large)
+    (define-key map [C-left] #'osm-left-large)
+    (define-key map [C-right] #'osm-right-large)
+    (define-key map [M-up] #'osm-up-large)
+    (define-key map [M-down] #'osm-down-large)
+    (define-key map [M-left] #'osm-left-large)
+    (define-key map [M-right] #'osm-right-large)
+    (define-key map "c" #'clone-buffer)
+    (define-key map "g" #'osm-goto)
+    (define-key map "s" #'osm-search)
+    (define-key map "b" #'bookmark-set)
+    (define-key map "B" #'bookmark-jump)
+    (define-key map [remap scroll-down-command] #'osm-down)
+    (define-key map [remap scroll-up-command] #'osm-up)
+    (define-key map "\d" nil)
+    (define-key map (kbd "S-SPC") nil)
+    (define-key map " " nil)
+    (define-key map "<" nil)
+    (define-key map ">" nil)
+    map)
+  "Keymap used by `osm-mode'.")
+
+(define-derived-mode osm-mode special-mode "Osm"
+  "Open Street Map mode."
+  :interactive nil
+  (let ((cache (osm--tile-cache)))
+    (unless (file-exists-p cache)
+      (make-directory cache t))
+    (run-with-idle-timer
+     30 nil
+     (lambda ()
+       (dolist (file (directory-files cache 'full "\\.png\\'" 'nosort))
+         (when (> (float-time
+                   (time-since
+                    (file-attribute-modification-time
+                     (file-attributes file))))
+                  (* 60 60 24 7))
+           (delete-file file))))))
+  (setq-local line-spacing nil
+              cursor-type nil
+              left-fringe-width 1
+              right-fringe-width 1
+              left-margin-width 0
+              right-margin-width 0
+              truncate-lines t
+              buffer-read-only t
+              revert-buffer-function #'osm--update
+              bookmark-make-record-function #'osm--make-bookmark
+              fringe-indicator-alist '((truncation . nil)))
+  (add-hook 'window-size-change-functions #'osm--update nil 'local))
+
+(defun osm--put (x y &optional image)
+  "Put tile IMAGE at X/Y."
+  (let* ((i (+ x (- (/ osm--x 256)) (/ (1- osm--width) 2)))
+         (j (+ y (- (/ osm--y 256)) (/ (1- osm--height) 2)))
+         (mx (if (= 0 i) (mod osm--x 256) 0))
+         (my (if (= 0 j) (mod osm--y 256) 0))
+         (pos (+ (point-min) (* j (1+ osm--width)) i)))
+    (when (and (>= i 0) (< i osm--width)
+               (>= j 0) (< j osm--height))
+      (setq image (or image `(image :type png :file ,(osm--tile-file x y 
osm--zoom)
+                                    :width 256 :height 256)))
+      (with-silent-modifications
+        (put-text-property
+         pos (1+ pos) 'display
+         (if (or (/= 0 mx) (/= 0 my))
+             `((slice ,mx ,my ,(- 256 mx) ,(- 256 my)) ,image)
+           image))))))
+
+;;;###autoload
+(defun osm-new (&optional unique)
+  "New OSM buffer, optionally UNIQUE."
+  (interactive "P")
+  (let ((lat (bound-and-true-p calendar-latitude))
+        (lon (bound-and-true-p calendar-longitude))
+        (zoom 11))
+    (unless (and lat lon)
+      (setq lat 0 lon 0 zoom 2))
+    (osm-goto lat lon zoom nil unique)))
+
+(defun osm--queue-info ()
+  "Return queue info string."
+  (let ((n (length osm--queue)))
+    (when (> n 0)
+      (format "(%s/%s)" (length osm--active) n))))
+
+(defun osm--update (&rest _)
+  "Update map display."
+  (unless (derived-mode-p #'osm-mode)
+    (error "Not an osm-mode buffer"))
+  (with-silent-modifications
+    (let* ((default-directory (osm--tile-cache))
+           (size (expt 2 osm--zoom))
+           (meter-per-pixel (/ (* 156543.03 (cos (/ (osm--lat) (/ 180.0 
float-pi)))) size))
+           (meter '(1 5 10 50 100 500 1000 5000 10000 50000 100000 500000 
1000000 5000000 10000000))
+           (idx 0))
+      (while (and (< idx (1- (length meter))) (< (/ (nth (1+ idx) meter) 
meter-per-pixel) 100))
+        (cl-incf idx))
+      (setq meter (nth idx meter))
+      (setq-local
+       header-line-format
+       (list
+        (format " OpenStreetMap %s %s    Z%-2d    %s%s%s %s %s    "
+                (format #("%7.2f°" 0 5 (face bold)) (osm--lat))
+                (format #("%7.2f°" 0 5 (face bold)) (osm--lon))
+                osm--zoom
+                (propertize " " 'face '(:inverse-video t)
+                            'display '(space :width (3)))
+                (propertize " " 'face '(:strike-through t)
+                            'display `(space :width (,(floor (/ meter 
meter-per-pixel)))))
+                (propertize " " 'face '(:inverse-video t)
+                            'display '(space :width (3)))
+                (if (>= meter 1000) (/ meter 1000) meter)
+                (if (>= meter 1000) "km" "m"))
+        '(:eval (osm--queue-info))))
+      (setq osm--height (1+ (ceiling (window-pixel-height) 256))
+            osm--width (1+ (ceiling (window-pixel-width) 256)))
+      (plist-put (cdr osm--placeholder1) :background (face-attribute 'default 
:background))
+      (plist-put (cdr osm--placeholder2) :background (face-attribute 'default 
:background))
+      (erase-buffer)
+      (dotimes (_j osm--height)
+        (insert (concat (make-string osm--width ?\s) "\n")))
+      (goto-char (point-min))
+      (dotimes (j osm--height)
+        (dotimes (i osm--width)
+          (let ((x (+ i (/ osm--x 256) (- (/ (1- osm--width) 2))))
+                (y (+ j (/ osm--y 256) (- (/ (1- osm--height) 2))))
+                (placeholder (if (= 0 (mod i 2)) osm--placeholder1 
osm--placeholder2)))
+            (if (and (>= x 0) (>= y 0) (< x size) (< y size))
+                (if (file-exists-p (osm--tile-file x y osm--zoom))
+                    (osm--put x y)
+                  (osm--put x y placeholder)
+                  (osm--enqueue x y))
+              (osm--put x y placeholder)))))
+      (setq osm--queue
+            (seq-sort-by
+             (pcase-lambda (`(,x ,y . ,_z))
+               (setq x (- x (/ osm--x 256))
+                     y (- y (/ osm--y 256)))
+               (+ (* x x) (* y y)))
+             #'< osm--queue))
+      (osm--download))))
+
+(declare-function bookmark-make-record-default "boomark")
+(defun osm--make-bookmark ()
+  "Make OSM bookmark."
+  `(,(osm--bookmark-name)
+    ,@(bookmark-make-record-default t)
+    (lon . ,(osm--lon))
+    (lat . ,(osm--lat))
+    (zoom . ,osm--zoom)
+    (name . ,(buffer-name))
+    (handler . ,#'osm-bookmark-jump)))
+
+(defun osm-goto (lat lon zoom &optional name unique)
+  "Goto LAT/LON/ZOOM in buffer NAME.
+The buffer is optionally assigned a UNIQUE name."
+  (interactive
+   (pcase-let ((`(,lat ,lon ,zoom) (mapcar #'string-to-number (split-string 
(read-string "Lat Lon (Zoom): ") nil t))))
+     (setq zoom (or zoom 11))
+     (unless (and (numberp lat) (numberp lon) (numberp zoom))
+       (error "Invalid coordindate"))
+     (list lat lon zoom)))
+  (with-current-buffer
+      (cond
+       ((and (not name) (not unique) (derived-mode-p #'osm-mode)) 
(current-buffer))
+       (unique (generate-new-buffer (or name "*osm*")))
+       (t (get-buffer-create (or name "*osm*"))))
+    (unless (derived-mode-p #'osm-mode)
+      (osm-mode))
+    (setq osm--zoom zoom)
+    (osm--set-lat-lon lat lon)
+    (if (get-buffer-window)
+        (osm--update)
+      (pop-to-buffer (current-buffer)))))
+
+;;;###autoload
+(defun osm-bookmark-jump (bm)
+  "Jump to OSM bookmark BM."
+  (osm-goto
+   (alist-get 'lat bm)
+   (alist-get 'lon bm)
+   (alist-get 'zoom bm)
+   (and (not (derived-mode-p #'osm-mode))
+        (alist-get 'name bm))))
+
+(defun osm--bookmark-name ()
+  "Return bookmark name for current map."
+  (format "OSM: %s%.2f° %.2f°"
+          (concat (osm--description) " ")
+          (osm--lat)
+          (osm--lon)))
+
+(defun osm--link-data ()
+  "Return link data."
+  (list (osm--lat) (osm--lon) osm--zoom (osm--description)))
+
+(defun osm--description ()
+  "Return descriptive string for current map."
+  (alist-get
+   'display_name
+   (json-parse-string
+    (shell-command-to-string
+     (concat
+      "curl -s "
+      (shell-quote-argument
+       (format 
"https://nominatim.openstreetmap.org/reverse?format=json&zoom=%s&lon=%s&lat=%s";
+               (min 18 (max 3 osm--zoom)) (osm--lon) (osm--lat)))))
+    :array-type 'list
+    :object-type 'alist)))
+
+;;;###autoload
+(defun osm-search ()
+  "Search for location and display the map."
+  (interactive)
+  ;; TODO add search bounded to current viewbox, bounded=1, viewbox=x1,y1,x2,y2
+  (let* ((search (completing-read
+                  "Location: " osm--search-history nil nil nil 
'osm--search-history))
+         (json (json-parse-string
+                (shell-command-to-string
+                 (concat "curl -s "
+                         (shell-quote-argument
+                          (concat 
"https://nominatim.openstreetmap.org/search?format=json&q=";
+                                  (url-encode-url search)))))
+                :array-type 'list
+                :object-type 'alist))
+         (results (mapcar
+                   (lambda (x)
+                     `(,(format "%s (%s° %s°)"
+                                (alist-get 'display_name x)
+                                (alist-get 'lat x)
+                                (alist-get 'lon x))
+                       ,(string-to-number (alist-get 'lat x))
+                       ,(string-to-number (alist-get 'lon x))
+                       ,@(mapcar #'string-to-number (alist-get 'boundingbox 
x))))
+                   (or json (error "No results"))))
+         (selected (or (cdr (assoc
+                             (completing-read
+                              (format "Matches for '%s': " search)
+                              results nil t nil t)
+                             results))
+                       (error "No selection"))))
+    (osm-goto (car selected) (cadr selected)
+               (apply #'osm--bb-to-zoom (cddr selected)))))
+
+(dolist (sym (list #'osm-up #'osm-down #'osm-left #'osm-right
+                   #'osm-up-large #'osm-down-large #'osm-left-large 
#'osm-right-large
+                   #'osm-smaller #'osm-larger))
+  (put sym 'command-modes '(osm-mode)))
+
+(provide 'osm)
+;;; osm.el ends here