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 @@
+xśUŽÍ
+Â0„=úcEHĄ<48>?ŕAko><3E>xRi“¶<E2809C>šJ˝<>ďî&jĹ=-3;ßNŢ´9–‹Ő`¤tŃÜ„DÚYѨ|Zgađ'ŞÖka ´Ĺ…+ÍÜÂMU$(jn0ˇý~<Çx„
hT	ćl·XöŞ›ňj([2˘JcD‡ŽWrŤqç>qc3¤R‹ě¤Łž:;Ç›_ŢH{3óŹôt­üG*äóŘ‚ŰV1źť÷Yç÷Ď]x÷íjE{Ç :ĘđÄ/â{˛Ó˘? ¤ł©Ć=•]Ó

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

@@ -0,0 +1,2 @@
+xœU<EFBFBD>1NÅ@D©‘¸Ã” ¡(_ÿtTˆ"øNâ‹Ýuäõ~NÏ&­=óf¦ÚãÜžo:EÉcL²m}Ù6,¦³Q|ÄUbÉ+	â˜Lã!4FJc<4A>Ä
^h•™œw¹ÁÙ¢$
+p=¤ArÑ<04>þ§ð'Å©Œ{5Ð8Ö?ùŸ¡âëS÷N«˜¦Èɱ’Éî{@íðÓ-È;ãòK?áÔ¶—]<5D>ôÙ\vsÞ×­2òXOß»S‰=[Þó²“ùAÍ®jã¼ðà²r¸6w·_¥jp%

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

@@ -0,0 +1,2 @@
+xœ5<EFBFBD>A
+Â0]z‡·ËF*uçօФíkˆùú“PééZwÃÀ0C”
ýùrxø<78>ñRqjŸXBŒpLT[‹Ìwe	™ana]
óæZw²iÚünº¶i›;‰IÆSÍÖ±+Ÿ‚Y^<14>Ö„âù?þ‚/“?.

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

@@ -0,0 +1,2 @@
+xœMÌ=
+€0@açž"ÒÐôgô(5<>è ‰÷Wœ\|Oú¾oq°K<15>ç:s+Tü‘S%¦#¡æÌsÁ<73>|âèêmk¿à•0Ž‰½“ïdúonj
¤¢§AëâˆYÿ

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

@@ -0,0 +1,2 @@
+xœ]<5D>A‚0D]“p‡cR1";náJY(Ћ)ÅÆ»ÛVÅà_ýÌëÌŸæm—#
+w‹E;”q¯Ê–çÛ&u<>™È»?­âã˜ãhe×áBáJ¹ f¡².
•Øèý~Î|<\zxb0–	¢I5SݤöVDcRðN=­Ù
ëÞ R¥ˆ™(Ó‹ðØÔ]æ~ÉÔ Â<>ô4­ìE]Èú‘€ªŽë
'¯á:wF÷–¾ù÷£Ä†æ­<C3A6>:ÿp[<5B>

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

@@ -0,0 +1,2 @@
+xœ5<EFBFBD>A
+Â0]r‡·ËF*Š'páôiûšÚ|M~héé­»a`˜v’çëåðŒcÁ+KÈ~Æ2N³W£ð]™:B¸û¸mŽåw«;ùÔÿünk¬y<C2AC>è¥;Õâ]ƒdDY ‚\4òüEfB¹ª5
1Å

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

@@ -0,0 +1,2 @@
+xœMÌ;
+€0@ëœb/ h>$[z”$û‚A+x|ÁÊvŠ©Wï§ó¤ Nhð
<01>VÒšŠÏÞ•šE6Ë®H`—l<E28094>ÜL¾õ¸‘‹4Ï1l¦~‘âof¡<>,‹>j^	tñ

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