templatekw: introduce obsfate keyword Introduce an obsfate printer that uses all helpers functions defined in obsutil to get all the obsfate-related data and format a string according to the current format in test-obsmarker-template.t. Then, introduce an obsfate templatekw that uses the obsfateprinter to return a list of strings. The goal is not to replace existing obsfate template functions but to propose a default, good-enough and easily usable obsfate definition for end-users that don't want to customize it. Such output would ultimately get included in the default log output. Here are some output examples for a commit amended: rewritten using amend as 5:a9b1f8652753 by test (at 1970-01-01 00:00 +0000) Next patches will make the output dependent on the verbosity. Exemple of use-cases: For having the obsfate on a single-line between brackets: {if(obsfate, " [{join(obsfate, "; ")}]")} For having the obsfate in several lines: {if(obsfate, "{obsfate % " Obsfate: {fate}\n"}")}

--- a/mercurial/templatekw.py	Tue Oct 10 02:25:03 2017 +0530
+++ b/mercurial/templatekw.py	Thu Oct 05 17:42:56 2017 +0200
@@ -600,6 +600,23 @@
     # rev and node are completely different from changeset's.
     return _mappable(f, None, f, lambda x: {'rev': mrev, 'node': mhex})
 
+@templatekeyword('obsfate')
+def showobsfate(**args):
+    # this function returns a list containing pre-formatted obsfate strings.
+    #
+    # This function will be replaced by templates fragments when we will have
+    # the verbosity templatekw available.
+    succsandmarkers = showsuccsandmarkers(**args)
+
+    ui = args['ui']
+
+    values = []
+
+    for x in succsandmarkers:
+        values.append(obsutil.obsfateprinter(x['successors'], x['markers'], ui))
+
+    return showlist("fate", values, args)
+
 def shownames(namespace, **args):
     """helper method to generate a template keyword for a namespace"""
     args = pycompat.byteskwargs(args)