Some tests ended up in a directory several directories deeper than $TESTTMP,
usually because some 'cd ..' had been forgotten between different test cases.
Add 'cd ..' where they are missing so the tests get back where they started.
diff ---/+++ should end filenames with a TAB when they contain spaces. Current
code failed to do so when only the +++ file had spaces. This only happened with
git renames from a name without space to one with space.
The only purpose of 'diff -U0' was to show that 'hg diff -U0' did almost the same.
Unfortunately 'diff -U0' on Solaris gives incorrect line numbers. Masking it
with globs wouldn't it make sense, so removing it is the best solution.
Prior to this patch "hg diff -U0", i.e., zero lines of context, would
output hunk headers with a start line one greater than what GNU patch
and git output. Guido van Rossum documents the unified diff format[1]
as having a start line value "one lower than one would expect" for
zero length hunks.
Comparing the behaviour of the three systems prior to this patch in
transforming
c1
c3
to
c1
c2
c3
- GNU "diff -U0" reports the hunk as "@@ -1,0 +2 @@"
- "git diff -U0" reports the hunk as "@@ -1,0 +2 @@"
- "hg diff -U0" reports the hunk as "@@ -2,0 +2,1 @@"
After this patch, "hg diff -U0" reports "@@ -1,0 +2,1 @@".
Since "hg export --config diff.unified=0" outputs zero-context unified
diffs, "hg import" has also been updated to account for start lines
one less than expected for zero length hunk ranges.
[1]: http://www.artima.com/weblogs/viewpost.jsp?thread=164293
