[kupfer] plugin.image: Image Tools plugin to scale and convert images

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 09b0d304bee954d11194aad89b78f823e17cabc8
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Tue Sep 15 15:48:37 2009 +0200

    plugin.image: Image Tools plugin to scale and convert images

 kupfer/plugin/image.py |   75 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/plugin/image.py b/kupfer/plugin/image.py
new file mode 100644
index 0000000..c3a7e41
--- /dev/null
+++ b/kupfer/plugin/image.py
@@ -0,0 +1,75 @@
+import os
+# since "path" is a very generic name, you often forget..
+from os import path as os_path
+
+from kupfer.objects import Leaf, Action, FileLeaf, TextLeaf
+from kupfer import utils
+
+__kupfer_name__ = _("Image Tools")
+__kupfer_sources__ = ()
+__kupfer_text_sources__ = ()
+__kupfer_actions__ = (
+		"Scale",
+	)
+__description__ = _("Image transformation tools")
+__version__ = ""
+__author__ = "Ulrik Sverdrup <ulrik sverdrup gmail com>"
+
+class PredefinedSize (Leaf):
+	pass
+
+class Scale (Action):
+	def __init__(self):
+		Action.__init__(self, _("Scale..."))
+
+	def has_result(self):
+		return True
+
+	def activate(self, leaf, obj):
+		size = self._make_size(obj.object)
+		fpath = leaf.object
+		dirname = os_path.dirname(fpath)
+		head, ext = os_path.splitext(os_path.basename(fpath))
+		filename = "%s_%s%s" % (head, size, ext)
+		dpath = utils.get_destpath_in_directory(dirname, filename)
+		cmdline = "convert -scale '%s' '%s' '%s'" % (size, fpath, dpath)
+		utils.launch_commandline(cmdline)
+		return FileLeaf(dpath)
+
+	def item_types(self):
+		yield FileLeaf
+
+	def valid_for_item(self, item):
+		# FIXME: Make this detection smarter
+		root, ext = os_path.splitext(item.object)
+		return ext.lower() in (".jpeg", ".jpg", ".png", ".gif")
+
+	def requires_object(self):
+		return True
+
+	def object_types(self):
+		yield PredefinedSize
+		yield TextLeaf
+
+	@classmethod
+	def _make_size(self, text):
+		size = None
+		try:
+			size = "%g" % float(text.strip())
+		except ValueError:
+			try:
+				twoparts = text.split("x", 1)
+				size = "%gx%g" % (float(twoparts[0].strip()),
+						float(twoparts[1].strip()))
+			except ValueError:
+				pass
+		return size
+
+	def valid_object(self, obj, for_item=None):
+		if isinstance(obj, TextLeaf):
+			return self._make_size(obj.object)
+		elif isinstance(obj, PredefinedSize):
+			return True
+
+	def get_description(self):
+		return _("Scale image to fit inside given pixel measure(s)")