[PATCH 3 of 5 RFC] lfs: add the '{raw}' template keyword to '{lfs_files}'

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1515967224 18000
#      Sun Jan 14 17:00:24 2018 -0500
# Node ID 197a87c27995bc3c59f0e22165ff60c7d43d2efc
# Parent  44ce4d93f9dce5393d0e2456ed89c7858dece71f
lfs: add the '{raw}' template keyword to '{lfs_files}'

Even though it is (probably) weird to have multiline output from a keyword,
something similar to this is useful as the public interface to dump the raw
pointer content.  I still haven't figured out how to use `hg debugdata` in a non
trivial repo, and that will just be a point of aggravation when debugging a
problem.

One problem will be that {lfs_files} only finds files that were added or
modified in a revision.  So maybe this is better on cat?  But I can't think of
any extensions that extend the generic templater like this, to figure out how to
do that.

diff --git a/hgext/lfs/__init__.py b/hgext/lfs/__init__.py
--- a/hgext/lfs/__init__.py
+++ b/hgext/lfs/__init__.py
@@ -231,6 +231,7 @@
     makemap = lambda v: {
         'lfs_file': v,
         'oid': pointers[v].oid(),
+        'raw': pointers[v].rawtext(),
     }
 
     # TODO: make the separator ', '?
diff --git a/hgext/lfs/pointer.py b/hgext/lfs/pointer.py
--- a/hgext/lfs/pointer.py
+++ b/hgext/lfs/pointer.py
@@ -24,11 +24,14 @@
     def __init__(self, *args, **kwargs):
         self['version'] = self.VERSION
         super(gitlfspointer, self).__init__(*args, **kwargs)
+        self._rawtext = ''
 
     @classmethod
     def deserialize(cls, text):
         try:
-            return cls(l.split(' ', 1) for l in text.splitlines()).validate()
+            p = cls(l.split(' ', 1) for l in text.splitlines()).validate()
+            p._rawtext = text  # Exclude from dict so it doesn't serialize
+            return p
         except ValueError: # l.split returns 1 item instead of 2
             raise InvalidPointer(_('cannot parse git-lfs text: %r') % text)
 
@@ -43,6 +46,11 @@
     def size(self):
         return int(self['size'])
 
+    def rawtext(self):
+        """The raw text read from the pointer file to create object.  This will
+        be empty for objects instantiated from key/values for serialization."""
+        return self._rawtext
+
     # regular expressions used by _validate
     # see https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md
     _keyre = re.compile(r'\A[a-z0-9.-]+\Z')
diff --git a/tests/test-lfs.t b/tests/test-lfs.t
--- a/tests/test-lfs.t
+++ b/tests/test-lfs.t
@@ -859,6 +859,12 @@
   oid sha256:5bb8341bee63b3649f222b2215bde37322bea075a30575aa685d8f8d21c77024
   size 29
   x-is-binary 0
+  $ hg --cwd convert_lfs log -r 0 -T '{lfs_files % "{raw}\n"}'
+  version https://git-lfs.github.com/spec/v1
+  oid sha256:5bb8341bee63b3649f222b2215bde37322bea075a30575aa685d8f8d21c77024
+  size 29
+  x-is-binary 0
+  
   $ hg --cwd convert_lfs \
   >     log -r 'all()' -T '{rev}: {lfs_files % "{lfs_file}: {oid}\n"}'
   0: a1: 5bb8341bee63b3649f222b2215bde37322bea075a30575aa685d8f8d21c77024