Add example repository

Before you had to do it through vanilla git

example-repo/.subcommit-git/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/master

example-repo/.subcommit-git/config

@@ -0,0 +1,5 @@
+[core]
+repositoryformatversion = 0
+filemode = false
+bare = false
+

example-repo/.subcommit-git/description

@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository

example-repo/.subcommit-git/objects/0f/2ed44ae1fc650e825befaf3101d8c1843fb0b7

@@ -0,0 +1,2 @@
+x<EFBFBD>U<EFBFBD><EFBFBD>
+<EFBFBD>0<10>=<17>cEH<45><48>?<3F>Ako><3E>xRi<><69><EFBFBD><EFBFBD>J<1A><><EFBFBD><EFBFBD>&j<>=-3;<3B>N޴9<DEB4><39><EFBFBD>`<60>t<EFBFBD>܄D<DC84>YѨ|Zga<67>'<27><>ka<6B><61>Ņ+<2B><><EFBFBD>MU$(jn0<6E><30>~<<3C>x<EFBFBD>
hT	<09>l<0C>X<EFBFBD><58><EFBFBD><EFBFBD>j([2<>JcD<><44>Wr<57>q<EFBFBD>>qc3<63>R<EFBFBD>줣<04>:;Ǜ_<C79B>H{3<1A><><EFBFBD>t<EFBFBD><74>G*<2A><>؂<EFBFBD>V1<56><31><EFBFBD>Y<EFBFBD><13><>]x<><78>jE{Ǡ:<3A><17><>/<2F>{<7B>Ӣ? <20><><EFBFBD><EFBFBD>=<3D>]<5D>

example-repo/.subcommit-git/objects/60/90762d7463b4c32775ac97d07825f318a1e6fd

@@ -0,0 +1,2 @@
+x<EFBFBD>U<EFBFBD>1N<EFBFBD>@D<><44><EFBFBD>Ô <20>(_<>tT<74>"<07>N<EFBFBD><04><>u<EFBFBD><75>~N<>&<10>=<3D>f<EFBFBD><0F><>ܞo:E<>cL<63>m}<7D>6,<2C><>Q|<7C>Ub<>+	<09><>L<EFBFBD>!4FJc<4A><63>
+^h<><68><EFBFBD>w<EFBFBD><77>٢$

example-repo/.subcommit-git/objects/a3/9d22cf13440c2b3110ecc5cd52d92f9ffb9e46

@@ -0,0 +1,2 @@
+x<EFBFBD>5<EFBFBD>A
+<EFBFBD>0]z<><7A><EFBFBD>F*u<>օ<17><0B><>k<12><><EFBFBD><EFBFBD>P<EFBFBD><50>Zw<5A><77>0C<30>
<01><>rx<72><78><EFBFBD>Rqj<71>XB<58>pLT[<08><>we	<09>ana]

example-repo/.subcommit-git/objects/af/cf3e3f1c25fa9b25587d92b8e7dcc94c63e4b2

@@ -0,0 +1,2 @@
+x<EFBFBD>M<EFBFBD>=
+<EFBFBD>0@a<><61>"<10><><EFBFBD>g<EFBFBD>(5<><35><EFBFBD><15><>W<EFBFBD>\|O<><4F>oq<>K<15><02>:s+T<>‘S%<25>#<23><><EFBFBD>s<EFBFBD><73>|<7C><><EFBFBD>mk<6D><6B><EFBFBD>0<EFBFBD><30><EFBFBD><EFBFBD><EFBFBD>d<EFBFBD>onj

example-repo/.subcommit-git/objects/b0/e134fa3838dfb2578979e75cbe839068d73b57

@@ -0,0 +1,2 @@
+x<EFBFBD>]<5D>A<0E>0D]<5D>p<EFBFBD>cR1";n<>JY(<28><04>)<29>ƻ<>V<EFBFBD><56>_<EFBFBD><5F><EFBFBD>̟<EFBFBD>m<EFBFBD>#
+w<EFBFBD>E;<3B>q<>ʖ<EFBFBD><CA96>&u<><75>Ȼ?<3F><><EFBFBD><EFBFBD><0F>he<68><65>B<EFBFBD>J<EFBFBD> f<><66>.

example-repo/.subcommit-git/objects/cf/a0e66fa6836cfca19a8c5de52133c0f8a90f71

@@ -0,0 +1,2 @@
+x<EFBFBD>5<EFBFBD>A
+<EFBFBD>0]r<><72><EFBFBD>F*<2A>'p<><05>i<><69><14>|M~h<><68><05><>a`<60>v<EFBFBD><16><><EFBFBD><EFBFBD><EFBFBD>c<EFBFBD>+K<>~<7E>2N<13>W£<57>]<5D>:B<06><><EFBFBD>m<EFBFBD><6D>w<>;<3B><><EFBFBD><EFBFBD>nk<>y<EFBFBD><79><EFBFBD>;<3B><>]<15>dDY<44><59>\4<><EFBFBD>EfB<66><42>5
1<>

example-repo/.subcommit-git/objects/ea/382b1b97785971a4f32155dd4ffe006e4df5e0

@@ -0,0 +1,2 @@
+x<EFBFBD>M<EFBFBD>;
+<EFBFBD>0@<40><>b/<2F>h>$[z<>$<24><>A+x|<7C><>v<EFBFBD><76>W<EFBFBD><57><12><> Nh<4E>
<01>VҚ<56><D29A>ޕ<EFBFBD>E6ˮH`<60>l<EFBFBD><6C>L<EFBFBD><4C><EFBFBD><06><>4<EFBFBD>1l<31>~<7E><>of<17><>,<1D>>j^	t<1F>

example-repo/.subcommit-git/refs/heads/master

@@ -0,0 +1 @@
+a3de24d2748d8aff1eb5d785d7a08b0aaa46d76b

example-repo/.subcommit-git/refs/heads/test

@@ -0,0 +1 @@
+a3de24d2748d8aff1eb5d785d7a08b0aaa46d76b

libwyag.py

@@ -50,7 +50,7 @@ class GitRepository (object):
 
     def __init__(self, path, force=False):
         self.worktree = path.replace("\\", "/")
-        self.gitdir = join_path(path, ".git")
+        self.gitdir = join_path(path, ".subcommit-git")
 
         if not (force or os.path.isdir(self.gitdir)):
             raise Exception(f"Not a git repository {path}")
@@ -156,7 +156,7 @@ def cmd_init(args):
 def repo_find(path=".", required=True):
     path = os.path.realpath(path)
 
-    if os.path.isdir(join_path(path, ".git")):
+    if os.path.isdir(join_path(path, ".subcommit-git")):
         return GitRepository(path)
 
     # If we haven't returned, recurse in parent
@@ -1093,7 +1093,7 @@ def check_ignore(rules, path):
         raise Exception("This function requires path to be relative to the repository's root")
 
     # Eh, just hardcode it
-    if (path.startswith(".git")):
+    if (path.startswith(".subcommit-git")):
         return True
 
     result = check_ignore_scoped(rules.scoped, path)
@@ -1487,6 +1487,7 @@ def tree_from_index(repo, index, commit_map, author, commit_time, message):
         if path in commit_map:
             (subcommit_hash, subcommit) = commit_map[path]
         else:
+            subcommit_hash = None
             subcommit = None
 
         if subcommit == None or subcommit.kvlm[b'tree'] != sha.encode('ascii'):
@@ -1530,12 +1531,18 @@ def cmd_commit(args):
     repo = repo_find()
     index = index_read(repo)
     root_commit_sha = object_find(repo, "HEAD")
-    root_commit = object_read(repo, root_commit_sha)
+    if root_commit_sha:
+        root_commit = object_read(repo, root_commit_sha)
+    else:
+        root_commit = None
 
     commit_time = datetime.now()
     author = gitconfig_user_get(gitconfig_read())
 
-    commit_map = create_commit_map(repo, root_commit)
+    if root_commit:
+        commit_map = create_commit_map(repo, root_commit)
+    else:
+        commit_map = dict()
 
     tree = tree_from_index(repo,
                            index,

readme.txt

@@ -0,0 +1,5 @@
+This is an implementation of alternate git internals where trees point to subcommits rather than other trees. This allows subdirectory history tracking to be baked into the repository structure.
+
+This is based on Write Yourself a Git (https://wyag.thb.lt/)
+
+Note that this requires >= Python 3.10