largefiles: handle logging from outside the repo

It's probably possible to refactor so that the 'if m._cwd' check isn't
necessary, but the False case is the typical case (i.e. run from the root of the
repo), and simpler to read.

An exact path to a largefile from outside the repo was previously ignored.

match.rel('.hglf') will handle figuring out both the correct '../' length to the
standin directory if inside the repo, or path/to/repo from outside, at the cost
of a pconvert() to keep the patterns using '/' on Windows.

hgext/largefiles/overrides.py

@@ -313,19 +313,25 b' def overridelog(orig, ui, repo, *pats, *'
             return tostandin(kindpat[1])
 
         if m._cwd:
-            if os.path.isabs(m._cwd):
-                # TODO: handle largefile magic when invoked from other cwd
-                return matchandpats
-            back = (m._cwd.count('/') + 1) * '../'
+            hglf = lfutil.shortname
+            back = util.pconvert(m.rel(hglf)[:-len(hglf)])
 
             def tostandin(f):
                 # The file may already be a standin, so trucate the back
-                # escaping and test before mangling it.  This avoids turning
+                # prefix and test before mangling it.  This avoids turning
                 # 'glob:../.hglf/foo*' into 'glob:../.hglf/../.hglf/foo*'.
                 if f.startswith(back) and lfutil.splitstandin(f[len(back):]):
                     return f
 
-                return back + lfutil.standin(m._cwd + '/' + f)
+                # An absolute path is from outside the repo, so truncate the
+                # path to the root before building the standin.  Otherwise cwd
+                # is somewhere in the repo, relative to root, and needs to be
+                # prepended before building the standin.
+                if os.path.isabs(m._cwd):
+                    f = f[len(back):]
+                else:
+                    f = m._cwd + '/' + f
+                return back + lfutil.standin(f)
 
             pats.update(fixpats(f, tostandin) for f in p)
         else:

tests/test-largefiles-misc.t

@@ -451,6 +451,10 b' Test actions on largefiles using relativ'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     anotherlarge
   
+  $ hg --debug log -T '{rev}: {desc}\n' ../sub/anotherlarge
+  updated patterns: ['../.hglf/sub/../sub/anotherlarge', '../sub/anotherlarge']
+  1: anotherlarge
+
   $ hg log -G anotherlarge
   @  changeset:   1:9627a577c5e9
   |  tag:         tip
@@ -510,6 +514,15 b' Test glob logging from the root dir'
 
   $ cd ..
 
+Log from outer space
+  $ hg --debug log -R addrm2 -T '{rev}: {desc}\n' 'addrm2/sub/anotherlarge'
+  updated patterns: ['addrm2/.hglf/sub/anotherlarge', 'addrm2/sub/anotherlarge']
+  1: anotherlarge
+  $ hg --debug log -R addrm2 -T '{rev}: {desc}\n' 'addrm2/.hglf/sub/anotherlarge'
+  updated patterns: ['addrm2/.hglf/sub/anotherlarge']
+  1: anotherlarge
+
+
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