Adding an indicator for Tim Pope's vim-obsession

powerline/config_files/colorschemes/vim/__main__.json

@@ -20,6 +20,7 @@
 		"winnr":              "information:unimportant",
 		"tabnr":              "file_directory",
 		"capslock_indicator": "paste_indicator",
+		"obsession_indicator": "information:unimportant",
 
 		"csv:column_number": "line_current",
 		"csv:column_name":   "line_current_symbol",

powerline/segments/vim/plugin/obsession.py

@@ -0,0 +1,22 @@
+# vim:fileencoding=utf-8:noet
+from __future__ import (unicode_literals, division, absolute_import, print_function)
+
+try:
+	import vim
+except ImportError:
+	vim = object()
+
+from powerline.bindings.vim import vim_func_exists
+from powerline.theme import requires_segment_info
+
+
+@requires_segment_info
+def obsession_indicator(pl, segment_info, text='rec.'):
+	'''Shows the indicator if tpope/vim-obsession plugin is enabled
+
+	:param str text:
+		String to show when obsession is recording sessions.
+	'''
+	if not vim_func_exists('ObsessionStatus'):
+		return None
+	return text if vim.eval('ObsessionStatus("on","off")') == "on"  else None