filter: add API for registering Python filters

pygit2/__init__.py

@@ -37,6 +37,7 @@
 from .credentials import *
 from .errors import check_error, Passthrough
 from .ffi import ffi, C
+from .filter import Filter, FilterSource, filter_register, filter_unregister
 from .index import Index, IndexEntry
 from .remote import Remote
 from .repository import Repository
@@ -117,6 +118,18 @@
 GIT_STASH_APPLY_PROGRESS_CHECKOUT_MODIFIED  : int = C.GIT_STASH_APPLY_PROGRESS_CHECKOUT_MODIFIED
 GIT_STASH_APPLY_PROGRESS_DONE               : int = C.GIT_STASH_APPLY_PROGRESS_DONE
 
+# GIT_FILTER
+GIT_FILTER_TO_WORKTREE              : int = C.GIT_FILTER_TO_WORKTREE
+GIT_FILTER_SMUDGE                   : int = C.GIT_FILTER_SMUDGE
+GIT_FILTER_TO_ODB                   : int = C.GIT_FILTER_TO_ODB
+GIT_FILTER_CLEAN                    : int = C.GIT_FILTER_CLEAN
+GIT_FILTER_DRIVER_PRIORITY          : int = C.GIT_FILTER_DRIVER_PRIORITY
+GIT_FILTER_DEFAULT                  : int = C.GIT_FILTER_DEFAULT
+GIT_FILTER_ALLOW_UNSAFE             : int = C.GIT_FILTER_ALLOW_UNSAFE
+GIT_FILTER_NO_SYSTEM_ATTRIBUTES     : int = C.GIT_FILTER_NO_SYSTEM_ATTRIBUTES
+GIT_FILTER_ATTRIBUTES_FROM_HEAD     : int = C.GIT_FILTER_ATTRIBUTES_FROM_HEAD
+GIT_FILTER_ATTRIBUTES_FROM_COMMIT   : int = C.GIT_FILTER_ATTRIBUTES_FROM_COMMIT
+
 # libgit version tuple
 LIBGIT2_VER = (LIBGIT2_VER_MAJOR, LIBGIT2_VER_MINOR, LIBGIT2_VER_REVISION)
 

pygit2/_run.py

@@ -81,6 +81,7 @@
     'revert.h',
     'stash.h',
     'submodule.h',
+    'filter.h',
     'callbacks.h', # Bridge from libgit2 to Python
 ]
 h_source = []
@@ -96,7 +97,7 @@
 ffi = FFI()
 ffi.set_source(
     "pygit2._libgit2",
-    "#include <git2.h>", # preamble
+    "#include <git2.h>\n#include <git2/sys/filter.h>", # preamble
     **libgit2_kw
 )
 ffi.cdef(C_HEADER_SRC)

pygit2/decl/callbacks.h

@@ -65,3 +65,31 @@ extern "Python" void _checkout_progress_cb(
 extern "Python" int _stash_apply_progress_cb(
     git_stash_apply_progress_t progress,
     void *payload);
+
+extern "Python" void _filter_shutdown_cb(git_filter *self);
+
+extern "Python" int _filter_check_cb(
+    git_filter *self,
+    void **payload,
+    const git_filter_source *src,
+    const char **attr_values);
+
+extern "Python" int _filter_stream_cb(
+    git_writestream **out,
+    git_filter *self,
+    void **payload,
+    const git_filter_source *src,
+    git_writestream *next);
+
+extern "Python" void _filter_cleanup_cb(
+    git_filter *self,
+    void *payload);
+
+extern "Python" int _writestream_write_cb(
+    git_writestream *stream,
+    const char *buffer,
+    size_t len);
+
+extern "Python" int _writestream_close_cb(git_writestream *stream);
+
+extern "Python" void _writestream_free_cb(git_writestream *stream);

pygit2/decl/filter.h

@@ -0,0 +1,67 @@
+typedef enum {
+	GIT_FILTER_TO_WORKTREE = 0,
+	GIT_FILTER_SMUDGE = GIT_FILTER_TO_WORKTREE,
+	GIT_FILTER_TO_ODB = 1,
+	GIT_FILTER_CLEAN = GIT_FILTER_TO_ODB
+} git_filter_mode_t;
+
+typedef enum {
+	GIT_FILTER_DEFAULT = 0u,
+	GIT_FILTER_ALLOW_UNSAFE = (1u << 0),
+	GIT_FILTER_NO_SYSTEM_ATTRIBUTES = (1u << 1),
+	GIT_FILTER_ATTRIBUTES_FROM_HEAD = (1u << 2),
+	GIT_FILTER_ATTRIBUTES_FROM_COMMIT = (1u << 3)
+} git_filter_flag_t;
+
+
+
+#define GIT_FILTER_VERSION ...
+
+#define GIT_FILTER_DRIVER_PRIORITY 200
+
+typedef struct git_filter_source git_filter_source;
+typedef struct git_filter git_filter;
+
+typedef int (*git_filter_init_fn)(git_filter *self);
+typedef void (*git_filter_shutdown_fn)(git_filter *self);
+typedef int (*git_filter_check_fn)(
+	git_filter              *self,
+	void                   **payload, /* NULL on entry, may be set */
+	const git_filter_source *src,
+	const char             **attr_values);
+typedef int (*git_filter_apply_fn)(
+	git_filter              *self,
+	void                   **payload, /* may be read and/or set */
+	git_buf                 *to,
+	const git_buf           *from,
+	const git_filter_source *src);
+typedef int (*git_filter_stream_fn)(
+	git_writestream        **out,
+	git_filter              *self,
+	void                   **payload,
+	const git_filter_source *src,
+	git_writestream         *next);
+typedef void (*git_filter_cleanup_fn)(
+	git_filter              *self,
+	void                    *payload);
+
+struct git_filter {
+	unsigned int           version;
+	const char            *attributes;
+	git_filter_init_fn     initialize;
+	git_filter_shutdown_fn shutdown;
+	git_filter_check_fn    check;
+	git_filter_apply_fn    apply; /* deprecated in favor of stream */
+	git_filter_stream_fn   stream;
+	git_filter_cleanup_fn  cleanup;
+};
+
+int git_filter_init(git_filter *filter, unsigned int version);
+int git_filter_register(
+	const char *name, git_filter *filter, int priority);
+int git_filter_unregister(const char *name);
+const char *git_filter_source_path(const git_filter_source *src);
+uint16_t git_filter_source_filemode(const git_filter_source *src);
+const git_oid *git_filter_source_id(const git_filter_source *src);
+git_filter_mode_t git_filter_source_mode(const git_filter_source *src);
+uint32_t git_filter_source_flags(const git_filter_source *src);

pygit2/decl/types.h

@@ -12,6 +12,13 @@ typedef struct git_submodule git_submodule;
 typedef struct git_transport git_transport;
 typedef struct git_tree git_tree;
 typedef struct git_packbuilder git_packbuilder;
+typedef struct git_writestream git_writestream;
+
+struct git_writestream {
+	int (*write)(git_writestream *stream, const char *buffer, size_t len);
+	int (*close)(git_writestream *stream);
+	void (*free)(git_writestream *stream);
+};
 
 typedef int64_t git_off_t;
 typedef int64_t git_time_t;