rust-matchers: remove default implementations for `Matcher` trait
We don't expect a whole lot of matchers to be defined, and this makes it more
obvious what a matcher does by reading its `impl Matcher for FooMatcher`.
This patch has the added benefit of fixing the `AlwaysMatcher`, its `matches`
function differs from the former default.
Differential Revision: https://phab.mercurial-scm.org/D7255
Create a repo and add some commits
$ hg init mm
$ cd mm
$ echo "Test content" > testfile1
$ hg add testfile1
$ hg commit -m "First commit" -u "Proper <commit@m.c>"
$ echo "Test content 2" > testfile2
$ hg add testfile2
$ hg commit -m "Second commit" -u "Commit Name 2 <commit2@m.c>"
$ echo "Test content 3" > testfile3
$ hg add testfile3
$ hg commit -m "Third commit" -u "Commit Name 3 <commit3@m.c>"
$ echo "Test content 4" > testfile4
$ hg add testfile4
$ hg commit -m "Fourth commit" -u "Commit Name 4 <commit4@m.c>"
Add a .mailmap file with each possible entry type plus comments
$ cat > .mailmap << EOF
> # Comment shouldn't break anything
> <proper@m.c> <commit@m.c> # Should update email only
> Proper Name 2 <commit2@m.c> # Should update name only
> Proper Name 3 <proper@m.c> <commit3@m.c> # Should update name, email due to email
> Proper Name 4 <proper@m.c> Commit Name 4 <commit4@m.c> # Should update name, email due to name, email
> EOF
$ hg add .mailmap
$ hg commit -m "Add mailmap file" -u "Testuser <test123@m.c>"
Output of commits should be normal without filter
$ hg log -T "{author}\n" -r "all()"
Proper <commit@m.c>
Commit Name 2 <commit2@m.c>
Commit Name 3 <commit3@m.c>
Commit Name 4 <commit4@m.c>
Testuser <test123@m.c>
Output of commits with filter shows their mailmap values
$ hg log -T "{mailmap(author)}\n" -r "all()"
Proper <proper@m.c>
Proper Name 2 <commit2@m.c>
Proper Name 3 <proper@m.c>
Proper Name 4 <proper@m.c>
Testuser <test123@m.c>
Add new mailmap entry for testuser
$ cat >> .mailmap << EOF
> <newmmentry@m.c> <test123@m.c>
> EOF
Output of commits with filter shows their updated mailmap values
$ hg log -T "{mailmap(author)}\n" -r "all()"
Proper <proper@m.c>
Proper Name 2 <commit2@m.c>
Proper Name 3 <proper@m.c>
Proper Name 4 <proper@m.c>
Testuser <newmmentry@m.c>
A commit with improperly formatted user field should not break the filter
$ echo "some more test content" > testfile1
$ hg commit -m "Commit with improper user field" -u "Improper user"
$ hg log -T "{mailmap(author)}\n" -r "all()"
Proper <proper@m.c>
Proper Name 2 <commit2@m.c>
Proper Name 3 <proper@m.c>
Proper Name 4 <proper@m.c>
Testuser <newmmentry@m.c>
Improper user
No TypeError beacause of invalid input
$ hg log -T '{mailmap(termwidth)}\n' -r0
80