/
tree.jl
193 lines (168 loc) · 6.22 KB
/
tree.jl
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# This file is a part of Julia. License is MIT: https://julialang.org/license
"""
treewalk(f, tree::GitTree, post::Bool=false)
Traverse the entries in `tree` and its subtrees in post or pre order. Preorder
means beginning at the root and then traversing the leftmost subtree (and
recursively on down through that subtree's leftmost subtrees) and moving right
through the subtrees. Postorder means beginning at the bottom of the leftmost
subtree, traversing upwards through it, then traversing the next right subtree
(again beginning at the bottom) and finally visiting the tree root last of all.
The function parameter `f` should have following signature:
(String, GitTreeEntry) -> Cint
A negative value returned from `f` stops the tree walk. A positive value means
that the entry will be skipped if `post` is `false`.
"""
function treewalk(f, tree::GitTree, post::Bool = false)
ensure_initialized()
# NOTE: don't use @check/GitError directly, because the code can be arbitrary
payload = Any[ tree, f ]
cbf = @cfunction(function treewalk_callback(root_cstr::Cstring, entry_ptr::Ptr{Cvoid}, payload::Vector{Any})::Cint
# decode arguments
root = unsafe_string(root_cstr)
tree = payload[1]::GitTree
f = payload[2]
entry = GitTreeEntry(tree, entry_ptr, false)
return f(root, entry)
end, Cint, (Cstring, Ptr{Cvoid}, Ref{Vector{Any}}))
err = ccall((:git_tree_walk, :libgit2), Cint,
(Ptr{Cvoid}, Cint, Ptr{Cvoid}, Any),
tree.ptr, post, cbf, payload)
if err < 0
err_class, _ = Error.last_error()
if err_class != Error.Callback
# now we now the code is valid
throw(GitError(err))
end
end
nothing
end
repository(tree::GitTree) = tree.owner
repository(te::GitTreeEntry) = repository(te.owner)
"""
filename(te::GitTreeEntry)
Return the filename of the object on disk to which `te` refers.
"""
function filename(te::GitTreeEntry)
ensure_initialized()
str = ccall((:git_tree_entry_name, :libgit2), Cstring, (Ptr{Cvoid},), te.ptr)
str != C_NULL && return unsafe_string(str)
return nothing
end
"""
filemode(te::GitTreeEntry) -> Cint
Return the UNIX filemode of the object on disk to which `te` refers as an integer.
"""
function filemode(te::GitTreeEntry)
ensure_initialized()
return ccall((:git_tree_entry_filemode, :libgit2), Cint, (Ptr{Cvoid},), te.ptr)
end
"""
entrytype(te::GitTreeEntry)
Return the type of the object to which `te` refers. The result will be
one of the types which [`objtype`](@ref) returns, e.g. a `GitTree` or `GitBlob`.
"""
function entrytype(te::GitTreeEntry)
ensure_initialized()
otype = ccall((:git_tree_entry_type, :libgit2), Cint, (Ptr{Cvoid},), te.ptr)
return objtype(Consts.OBJECT(otype))
end
"""
entryid(te::GitTreeEntry)
Return the [`GitHash`](@ref) of the object to which `te` refers.
"""
function entryid(te::GitTreeEntry)
ensure_initialized()
GC.@preserve te begin
oid_ptr = ccall((:git_tree_entry_id, :libgit2), Ptr{UInt8}, (Ptr{Cvoid},), te.ptr)
oid = GitHash(oid_ptr)
end
return oid
end
function count(tree::GitTree)
ensure_initialized()
return ccall((:git_tree_entrycount, :libgit2), Csize_t, (Ptr{Cvoid},), tree.ptr)
end
function Base.getindex(tree::GitTree, i::Integer)
if i < 1 || i > count(tree)
throw(BoundsError(tree, i))
end
ensure_initialized()
te_ptr = ccall((:git_tree_entry_byindex, :libgit2),
Ptr{Cvoid},
(Ptr{Cvoid}, Csize_t), tree.ptr, i-1)
return GitTreeEntry(tree, te_ptr, false)
end
"""
(::Type{T})(te::GitTreeEntry) where T<:GitObject
Get the git object to which `te` refers and return it as its actual type (the type
[`entrytype`](@ref) would show), for instance a `GitBlob` or `GitTag`.
# Examples
```julia
tree = LibGit2.GitTree(repo, "HEAD^{tree}")
tree_entry = tree[1]
blob = LibGit2.GitBlob(tree_entry)
```
"""
function GitObject(e::GitTreeEntry) end
function (::Type{T})(te::GitTreeEntry) where T<:GitObject
ensure_initialized()
repo = repository(te)
obj_ptr_ptr = Ref{Ptr{Cvoid}}(C_NULL)
@check ccall((:git_tree_entry_to_object, :libgit2), Cint,
(Ptr{Ptr{Cvoid}}, Ptr{Cvoid}, Ref{Nothing}),
obj_ptr_ptr, repo.ptr, te.ptr)
return T(repo, obj_ptr_ptr[])
end
function Base.show(io::IO, te::GitTreeEntry)
println(io, "GitTreeEntry:")
println(io, "Entry name: ", filename(te))
println(io, "Entry type: ", entrytype(te))
println(io, "Entry OID: ", entryid(te))
end
function Base.show(io::IO, tree::GitTree)
println(io, "GitTree:")
println(io, "Owner: ", repository(tree))
println(io, "Number of entries: ", count(tree))
end
"""
getindex(tree::GitTree, target::AbstractString) -> GitObject
Look up `target` path in the `tree`, returning a [`GitObject`](@ref) (a [`GitBlob`](@ref) in
the case of a file, or another [`GitTree`](@ref) if looking up a directory).
# Examples
```julia
tree = LibGit2.GitTree(repo, "HEAD^{tree}")
readme = tree["README.md"]
subtree = tree["test"]
runtests = subtree["runtests.jl"]
```
"""
function Base.getindex(tree::GitTree, target::AbstractString)
if basename(target) == ""
# get rid of any trailing separator
target = dirname(target)
end
if target == "" || target == "/"
return tree
end
local oid = nothing
function _getindex_callback(root::String, entry::GitTreeEntry)::Cint
path = joinpath(root, filename(entry))
if path == target
# we found the target, save the oid and stop the walk
oid = entryid(entry)
# workaround for issue: https://github.com/libgit2/libgit2/issues/4693
ensure_initialized()
ccall((:giterr_set_str, :libgit2), Cvoid,
(Cint, Cstring), Cint(Error.Callback),
"git_tree_walk callback returned -1")
return -1
elseif entrytype(entry) == GitTree && !startswith(target, path)
# this subtree isn't relevant, so skip it
return 1
end
return 0
end
treewalk(_getindex_callback, tree)
oid === nothing && throw(KeyError(target))
return GitObject(repository(tree), oid)
end