encoding: add 'trim' to trim multi-byte characters at most specified columns
Newly added 'trim' is used to trim multi-byte characters at most
specified columns correctly: directly slicing byte sequence should be
replaced with 'encoding.trim', because the former may split at
intermediate multi-byte sequence.
Slicing unicode sequence ('uslice') and concatenation with ellipsis
('concat') are defined as function, to make enhancement in subsequent
patch easier.
changeset = '{rev}{tags}{bookmarks}{parents} {node|short} {date|isodate} {author|user}\n {desc|firstline|strip}\n\n'
changeset_quiet = '{rev}:{node|short}\n'
changeset_verbose = '{rev}{tags}{parents} {node|short} {date|isodate} {author}\n {desc|strip}\n\n'
start_tags = '['
tag = '{tag},'
last_tag = '{tag}]'
start_parents = ':'
parent = '{rev},'
last_parent = '{rev}'
start_bookmarks = '['
bookmark = '{bookmark},'
last_bookmark = '{bookmark}]'