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|
#!/usr/bin/env escript
%% -*- erlang -*-
%%
%% extract_notes --
%%
%% Extract release notes from commit comments.
%%
%% Copyright (c) 2009 Bjorn Gustavsson
%%
%% See the file "license.terms" for information on usage and redistribution
%% of this file, and for a DISCLAIMER OF ALL WARRANTIES.
%%
-mode(compile).
main(_) ->
ok = io:setopts(standard_io, [{encoding, unicode}]),
PrevRel = binary_to_list(chomp(git(["describe","--abbrev=0"]))),
Log = git(["log","--no-color","--reverse",PrevRel++".."]),
extract_notes(Log),
init:stop().
author_to_nick(<<"Bjorn Gustavsson",_/binary>>) -> <<"bjorng">>;
author_to_nick(<<"Richard Jones",_/binary>>) -> <<"optigon">>;
author_to_nick(<<"Dan Gudmundsson",_/binary>>) -> <<"dgud">>;
author_to_nick(<<"Andrzej Giniewicz",_/binary>>) -> <<"giniu">>;
author_to_nick(<<"Anthony D'Agostino",_/binary>>) -> <<"scorpius">>;
author_to_nick(Author) ->
re:replace(Author, "\s*<.*$", "", [{return,binary}]).
extract_notes(Log) ->
Commits = break_into_commits(Log),
{ok,Re} = re:compile("Author:\s*([^\n]*).*?\n\\s*N[Oo][Tt][Ee]:(.*?)$",
[dotall]),
Notes = filter_commits(Commits, Re),
[format_note(Au, N) || [Au,N] <- Notes],
ok.
break_into_commits(Bin) ->
bic_1(Bin, <<>>).
bic_1(<<"\ncommit ",T/binary>>, Commit) ->
[<<Commit/binary,$\n>>|bic_1(T, <<"commit ">>)];
bic_1(<<H,T/binary>>, Commit) ->
bic_1(T, <<Commit/binary,H>>);
bic_1(<<>>, Commit) ->
%% Ensure that each commit ends with exactly two newlines.
[<<Commit/binary,$\n>>].
filter_commits([C|Cs], Re) ->
Res = re:run(C, Re, [{capture,all_but_first,binary}]),
case Res of
nomatch ->
filter_commits(Cs, Re);
{match,Note} ->
[Note|filter_commits(Cs, Re)]
end;
filter_commits([], _) -> [].
format_note(Author, Note0) ->
Note1 = maybe_add_nick(Author, Note0),
{Note,T} = split_after_nl(skip_ws(Note1)),
io:put_chars(["- ",Note]),
format_note_1(skip_ws(T)),
io:nl().
format_note_1(<<>>) -> ok;
format_note_1(Note0) ->
{Note,T} = split_after_nl(Note0),
io:put_chars([" ",Note]),
format_note_1(skip_blanks(T)).
split_after_nl(Bin) ->
Pos = split_after_nl_1(Bin, 0),
split_binary(Bin, Pos).
split_after_nl_1(<<$\n,_/binary>>, N) ->
N+1;
split_after_nl_1(<<_,T/binary>>, N) ->
split_after_nl_1(T, N+1);
split_after_nl_1(<<>>, N) ->
N.
maybe_add_nick(Author, Note) ->
case re:run(Note, "\\[.*?\\]\s*$") of
{match,_} -> Note;
nomatch ->
Nick0 = author_to_nick(Author),
Nick = <<$\s,$[,Nick0/binary,$],$\n>>,
<<(chomp(Note))/binary,Nick/binary>>
end.
skip_ws(<<S,T/binary>>) when S =< $\s -> skip_ws(T);
skip_ws(T) -> T.
skip_blanks(<<$\s,T/binary>>) -> skip_blanks(T);
skip_blanks(T) -> T.
chomp(Bin) ->
N = byte_size(Bin) - 1,
case Bin of
<<Prefix:N/binary,$\n>> ->
Prefix;
_ ->
Bin
end.
git(Args) ->
Git = case get(git) of
undefined ->
case os:find_executable(git) of
false ->
fatal("git not found");
Path ->
put(git, Path),
Path
end;
Path -> Path
end,
P = open_port({spawn_executable,Git},
[{args,Args},binary,in,eof]),
get_data(P).
get_data(Port) ->
get_data(Port, <<>>).
get_data(Port, Sofar) ->
receive
{Port,eof} ->
erlang:port_close(Port),
Sofar;
{Port,{data,Bytes}} ->
get_data(Port, <<Sofar/binary,Bytes/binary>>);
{'EXIT',Port, _} ->
Sofar
end.
fatal(Str) ->
io:format(err, "extract_notes: ~s\n", [Str]),
halt(1).
|
