From 2d9cdc5a24c869add1f67b02813a3ec6da012bd7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jannis=20V=C3=B6lker?= <jbvoelker@googlemail.com>
Date: Wed, 13 Sep 2017 17:16:57 +0200
Subject: [PATCH] GPX export script which generates a GPX track from all
 selected images containing geo information

---
 contrib/gpx_export.lua | 140 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 contrib/gpx_export.lua

diff --git a/contrib/gpx_export.lua b/contrib/gpx_export.lua
new file mode 100644
index 0000000..640809f
--- /dev/null
+++ b/contrib/gpx_export.lua
@@ -0,0 +1,140 @@
+--[[
+    This file is part of darktable,
+    copyright (c) 2017 Jannis_V
+
+    darktable 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.
+    darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
+]]
+
+--[[
+Simple darktable GPX generator script
+
+This script generates a GPX track from all images having GPS latitude
+and longitude information
+]]
+
+local dt = require "darktable"
+local df = require "lib/dtutils.file"
+local dl = require "lib/dtutils"
+local gettext = dt.gettext
+
+dt.configuration.check_version(...,{3,0,0},{4,0,0},{5,0,0})
+
+-- Tell gettext where to find the .mo file translating messages for a particular domain
+gettext.bindtextdomain("gpx_export",dt.configuration.config_dir.."/lua/locale/")
+
+local function _(msgid)
+  return gettext.dgettext("gpx_export", msgid)
+end
+
+local path_entry = dt.new_widget("entry")
+{
+  text = dt.preferences.read("gpx_exporter", "gpxExportPath", "string"),
+  editable=true,
+  reset_callback = function(self)
+    self.text = "~/darktable.gpx"
+    dt.preferences.write("gpx_exporter", "gpxExportPath", "string", self.text)
+  end,
+  tooltip = _("gpx file path"),
+}
+
+local function stop_job(job)
+  job.valid = false
+end
+
+local function create_gpx_file()
+  dt.preferences.write("gpx_exporter", "gpxExportPath", "string", path_entry.text)
+
+  path = path_entry.text:gsub("^~", os.getenv("HOME")) -- Expand ~ to home
+  path = path:gsub("//", "/")
+
+  dt.print(_("exporting gpx file..."))
+
+  job = dt.gui.create_job(_("gpx export"), true, stop_job)
+
+  local gpx_file = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?>\n"
+  gpx_file = gpx_file.."<gpx xmlns=\"http://www.topografix.com/GPX/1/1\" creator=\"Darktable GPX Exporter\"\n version=\"1.1\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n xsi:schemaLocation=\"http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd\">\n"
+  gpx_file = gpx_file.."\t<trk>\n"
+  gpx_file = gpx_file.."\t\t<trkseg>\n";
+
+  local sel_images = dt.gui.action_images
+  for key,image in dl.spairs(sel_images, function(t, a, b) return t[b].exif_datetime_taken > t[a].exif_datetime_taken end) do
+
+    if(job.valid) then
+      job.percent = (key - 1) / #sel_images
+
+      if ((image.longitude and image.latitude) and
+        (image.longitude ~= 0 and image.latitude ~= 90) -- Just in case
+      ) then
+
+        if(image.exif_datetime_taken == "") then
+          dt.print(image.path.."/"..image.filename.._(" does not have date information and won't be processed"))
+          print(image.path.."/"..image.filename.._(" does not have date information and won't be processed")) -- Also print to terminal
+        else
+          date_format = "(%d+):(%d+):(%d+) (%d+):(%d+):(%d+)"
+          my_year, my_month, my_day, my_hour, my_min, my_sec = image.exif_datetime_taken:match(date_format)
+
+          local my_timestamp = os.time({year=my_year, month=my_month, day=my_day, hour=my_hour, min=my_min, sec=my_sec})
+
+          gpx_file = gpx_file.."\t\t\t<trkpt lat=\""..string.gsub(tostring(image.latitude), ",", ".").."\" lon=\""..string.gsub(tostring(image.longitude), ",", ".").."\">\n"
+          gpx_file = gpx_file.."\t\t\t\t<time>"..os.date("!%Y-%m-%dT%H:%M:%SZ",my_timestamp).."</time>\n"
+          gpx_file = gpx_file.."\t\t\t</trkpt>\n"
+        end
+      end
+      else
+        break
+    end
+  end
+
+  job.valid = false
+
+  gpx_file = gpx_file.."\t\t</trkseg>\n";
+  gpx_file = gpx_file.."\t</trk>\n";
+  gpx_file = gpx_file.."</gpx>\n";
+
+  local file = io.open(path, "w")
+  if (file == nil) then
+    dt.print(_("invalid path: ")..path)
+  else
+    file:write(gpx_file)
+    file:close()
+    dt.print(_("gpx file created: ")..path)
+  end
+end
+
+dt.register_lib(
+  "gpx_exporter",
+  "gpx export",
+  true, -- expandable
+  true, -- resetable
+  {[dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 100}},   -- containers
+  dt.new_widget("box")
+  {
+    orientation = "vertical",
+    dt.new_widget("button")
+    {
+      label = _("export"),
+      tooltip = _("export gpx file"),
+      clicked_callback = create_gpx_file
+    },
+    dt.new_widget("box")
+    {
+      orientation = "horizontal",
+      dt.new_widget("label")
+      {
+        label = _("file:"),
+      },
+      path_entry
+    },
+  },
+  nil,-- view_enter
+  nil -- view_leave
+)