pager: add tests
We've never had tests for pager, and I want to start experimenting
with ways to clean up the implementation and make it a bit more
graceful.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-pager.t Sun Feb 28 22:13:47 2016 -0500
@@ -0,0 +1,153 @@
+ $ cat >> fakepager.py <<EOF
+ > import sys
+ > for line in sys.stdin:
+ > sys.stdout.write('paged! %r\n' % line)
+ > EOF
+
+Enable ui.formatted because pager won't fire without it, and set up
+pager and tell it to use our fake pager that lets us see when the
+pager was running.
+ $ cat >> $HGRCPATH <<EOF
+ > [ui]
+ > formatted = yes
+ > [extensions]
+ > pager=
+ > [pager]
+ > pager = python $TESTTMP/fakepager.py
+ > EOF
+
+ $ hg init repo
+ $ cd repo
+ $ echo a >> a
+ $ hg add a
+ $ hg ci -m 'add a'
+ $ for x in `python $TESTDIR/seq.py 1 10`; do
+ > echo a $x >> a
+ > hg ci -m "modify a $x"
+ > done
+
+By default diff and log are paged, but summary is not:
+
+ $ hg diff -c 2 --pager=yes
+ paged! 'diff -r f4be7687d414 -r bce265549556 a\n'
+ paged! '--- a/a\tThu Jan 01 00:00:00 1970 +0000\n'
+ paged! '+++ b/a\tThu Jan 01 00:00:00 1970 +0000\n'
+ paged! '@@ -1,2 +1,3 @@\n'
+ paged! ' a\n'
+ paged! ' a 1\n'
+ paged! '+a 2\n'
+
+ $ hg log --limit 2
+ paged! 'changeset: 10:46106edeeb38\n'
+ paged! 'tag: tip\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 10\n'
+ paged! '\n'
+ paged! 'changeset: 9:6dd8ea7dd621\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 9\n'
+ paged! '\n'
+
+ $ hg summary
+ parent: 10:46106edeeb38 tip
+ modify a 10
+ branch: default
+ commit: (clean)
+ update: (current)
+ phases: 11 draft
+
+We can enable the pager on summary:
+
+ $ hg --config pager.attend-summary=yes summary
+ paged! 'parent: 10:46106edeeb38 tip\n'
+ paged! ' modify a 10\n'
+ paged! 'branch: default\n'
+ paged! 'commit: (clean)\n'
+ paged! 'update: (current)\n'
+ paged! 'phases: 11 draft\n'
+
+If we completely change the attend list that's respected:
+
+ $ hg --config pager.attend-diff=no diff -c 2
+ diff -r f4be7687d414 -r bce265549556 a
+ --- a/a Thu Jan 01 00:00:00 1970 +0000
+ +++ b/a Thu Jan 01 00:00:00 1970 +0000
+ @@ -1,2 +1,3 @@
+ a
+ a 1
+ +a 2
+
+ $ hg --config pager.attend=summary diff -c 2
+ diff -r f4be7687d414 -r bce265549556 a
+ --- a/a Thu Jan 01 00:00:00 1970 +0000
+ +++ b/a Thu Jan 01 00:00:00 1970 +0000
+ @@ -1,2 +1,3 @@
+ a
+ a 1
+ +a 2
+
+If 'log' is in attend, then 'history' should also be paged:
+ $ hg history --limit 2 --config pager.attend=log
+ paged! 'changeset: 10:46106edeeb38\n'
+ paged! 'tag: tip\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 10\n'
+ paged! '\n'
+ paged! 'changeset: 9:6dd8ea7dd621\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 9\n'
+ paged! '\n'
+
+Possible bug: history is explicitly ignored in pager config, but
+because log is in the attend list it still gets pager treatment.
+
+ $ hg history --limit 2 --config pager.attend=log \
+ > --config pager.ignore=history
+ paged! 'changeset: 10:46106edeeb38\n'
+ paged! 'tag: tip\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 10\n'
+ paged! '\n'
+ paged! 'changeset: 9:6dd8ea7dd621\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 9\n'
+ paged! '\n'
+
+Possible bug: history is explicitly marked as attend-history=no, but
+it doesn't fail to get paged because log is still in the attend list.
+
+ $ hg history --limit 2 --config pager.attend-history=no
+ paged! 'changeset: 10:46106edeeb38\n'
+ paged! 'tag: tip\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 10\n'
+ paged! '\n'
+ paged! 'changeset: 9:6dd8ea7dd621\n'
+ paged! 'user: test\n'
+ paged! 'date: Thu Jan 01 00:00:00 1970 +0000\n'
+ paged! 'summary: modify a 9\n'
+ paged! '\n'
+
+Possible bug: disabling pager for log but enabling it for history
+doesn't result in history being paged.
+
+ $ hg history --limit 2 --config pager.attend-log=no \
+ > --config pager.attend-history=yes
+ changeset: 10:46106edeeb38
+ tag: tip
+ user: test
+ date: Thu Jan 01 00:00:00 1970 +0000
+ summary: modify a 10
+
+ changeset: 9:6dd8ea7dd621
+ user: test
+ date: Thu Jan 01 00:00:00 1970 +0000
+ summary: modify a 9
+