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libgit2.lisp
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libgit2.lisp
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(in-package :libgit2)
(defparameter *repository* nil)
(defmacro check-git-error (form &body handlers)
(let ((error-code (gensym)))
`(restart-case
(let ((,error-code ,form))
(case ,error-code
(:success ,error-code)
,@handlers
(t (error "libgit2 error ~s from ~s" ,error-code ',(car form)))))
(continue () :report "Continue" ))))
(defun repository-open (path)
;; todo: wrap it in something and add finalizer where possible...
(cffi:with-foreign-object(repo '%git:repository)
(check-git-error (%git:repository-open repo path))
(cffi:mem-aref repo '%git:repository)))
(defmacro with-git-repository ((path &optional (var '*repository*)) &body body)
`(let ((,var nil))
(unwind-protect
(progn
(setf ,var (repository-open ,path))
,@body)
(when ,var (%git:repository-free ,var)))))
(defclass git-object ()
;; keep a pointer to the repo, so it can be kept alive as long as there
;; are objects using it, in case it switches to finalizers
;; fixme: probably should check for repo that has been explicitly closed
;; before accessing foreign pointers in objects?
((repo :initarg :repo :reader repo)
(pointer :initarg :pointer :reader pointer)))
(defmethod object-id ((object git-object))
(%git:object-id (pointer object)))
(defmethod object-type ((object git-object))
(%git:object-type (pointer object)))
(defmethod object-owner ((object git-object))
(repo object)
#++(%git:object-owner (pointer object)))
(defclass git-commit (git-object)
())
(defmethod commit-id ((object git-commit))
(%git:commit-id (pointer object)))
(defmethod commit-message-short ((object git-commit))
(%git:commit-message-short (pointer object)))
(defmethod commit-message ((object git-commit))
(%git:commit-message (pointer object)))
(defmethod commit-time ((object git-commit))
(%git:commit-time (pointer object)))
(defmethod commit-author ((object git-commit))
(let ((a (%git::commit-author (pointer object))))
(prog1
(list (cffi:foreign-slot-value a '%git::signature '%git::name)
(cffi:foreign-slot-value a '%git::signature '%git::email)
(cffi:foreign-slot-value a '%git::signature '%git::when))
;; not sure if a needs freed or not?
#++(%git:signature-free a))))
(defmethod (setf commit-author) (value (object git-commit))
(destructuring-bind (name email &optional (when (get-universal-time)))
value
(let ((s (%git:signature-new name email when
(- (* 60 (nth-value 8 (decode-universal-time
when)))))))
(%git:commit-set-author (pointer object) s)
(%git:signature-free s))))
(defmethod commit-committer ((object git-commit))
(let ((a (%git::commit-committer (pointer object))))
(prog1
(list (cffi:foreign-slot-value a '%git::signature '%git::name)
(cffi:foreign-slot-value a '%git::signature '%git::email)
(cffi:foreign-slot-value a '%git::signature '%git::when))
;; not sure if a needs freed or not? - apparently not
#++(%git:signature-free a))))
(defmethod (setf commit-committer) (value (object git-commit))
(destructuring-bind (name email &optional (when (get-universal-time)))
value
(let ((s (%git:signature-new name email when
(- (* 60 (nth-value 8 (decode-universal-time
when)))))))
(%git:commit-set-committer (pointer object) s)
(%git:signature-free s))))
(defun commit-parents (commit)
(loop for i below (%git:commit-parentcount (pointer commit))
collect (make-instance 'git-commit
:pointer (%git:commit-parent (pointer commit) i))))
(defclass git-tree (git-object)
())
(defmethod tree-id ((object git-tree))
(%git:tree-id (pointer object)))
(defmethod tree-entry-count ((object git-tree))
(%git:tree-entrycount (pointer object)))
(defmethod tree-entry-count ((object git-tree))
(%git:tree-entrycount (pointer object)))
(defmethod tree-entries ((object git-tree))
(loop for i below (tree-entry-count object)
collect (%git:tree-entry-by-index (pointer object) i)))
(defmethod commit-tree ((object git-commit))
(make-instance 'git-tree
:repo (repo object)
:pointer (%git:commit-tree (pointer object))))
(defun lookup (repo id &key (type :any))
(cffi:with-foreign-object (object '%git::commit)
(check-git-error (%git:repository-lookup object repo id type))
(case (%git:object-type (cffi:mem-aref object :pointer))
(:commit
(make-instance 'git-commit
:repo repo
:pointer (cffi:mem-aref object :pointer)))
(:tree
(make-instance 'git-tree
:repo repo
:pointer (cffi:mem-aref object :pointer)))
(t (make-instance 'git-object
:repo repo
:pointer (cffi:mem-aref object :pointer))))))
(defun lookup-commit (repo id)
(cffi:with-foreign-object (object '(:pointer %git::commit))
(check-git-error (%git:repository-lookup object repo id :commit))
(make-instance 'git-commit
:repo repo
:pointer (cffi:mem-aref object '%git::commit))))
(defun dump-tree (tree)
(format t " tree = ~s (~s)~%" tree (tree-id tree))
(format t " count = ~s~%" (tree-entry-count tree) )
(loop for e in (tree-entries tree)
for i from 0
do (format t " ~s = ~s / ~s / ~6,'0o~%" i (%git:tree-entry-name e)
(%git:tree-entry-id e)
(%git:tree-entry-attributes e)))
)
(defun dump-commit (c)
(format t " i= ~s~%" (commit-id c))
(format t " m= ~s~%" (commit-message-short c))
(format t " mm= ~s~%" (commit-message c))
(format t " @ ~s~%" (reverse (multiple-value-list (decode-universal-time (commit-time c)))))
(format t " a= ~s~%" (commit-author c))
(format t " c= ~s~%" (commit-committer c))
(dump-tree (commit-tree c))
(loop for p in (commit-parents c)
for i from 0
do (format t "parent ~s :~%" i)
(dump-commit p)
(format t "<<<<<~%"))
)
#++
(with-git-repository ("/tmp/foo/bar/.git" repo)
(format t "repo = ~s~%" repo)
(let ((o (lookup repo "1907b540bb65c09cc8ba2f3547cfdd8a40f994bc" :type :commit)))
(format t "lookup = ~s~%" o)
(format t " = ~s / ~s / ~s~%" (object-type o)
(object-owner o)
(object-id o)))
(let ((o (lookup-commit repo "1907b540bb65c09cc8ba2f3547cfdd8a40f994bc")))
(dump-commit o)
(setf (commit-author o) (list "foo" "bar" (get-universal-time)))
(format t " a= ~s~%" (commit-author o))
(format t " i= ~s~%" (commit-id o))
(%git::object-write (pointer o))
)
)