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LibGit2: Add GitTree constructor that wraps git_tree_lookup #59994

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Merged
merged 1 commit into from
Nov 1, 2025
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LibGit2: Add GitTree constructor that wraps git_tree_lookup #59994

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22 changes: 22 additions & 0 deletions stdlib/LibGit2/src/tree.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,28 @@ function GitTree(c::GitCommit)
GitTree(repository(c), tree_out[])
end

"""
GitTree(repo::GitRepo, tree_oid::GitHash)

Look up a tree object in the repository using its GitHash.
This constructor wraps the libgit2 git_tree_lookup function.

# Examples
```julia
tree_hash = LibGit2.GitHash(repo, "HEAD^{tree}")
tree = LibGit2.GitTree(repo, tree_hash)
```
"""
function GitTree(repo::GitRepo, tree_oid::GitHash)
ensure_initialized()
tree_out = Ref{Ptr{Cvoid}}(C_NULL)
oid_ptr = Ref(tree_oid)
@check ccall((:git_tree_lookup, libgit2), Cint,
(Ptr{Ptr{Cvoid}}, Ptr{Cvoid}, Ptr{GitHash}),
tree_out, repo, oid_ptr)
return GitTree(repo, tree_out[])
end

"""
treewalk(f, tree::GitTree, post::Bool=false)

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8 changes: 8 additions & 0 deletions stdlib/LibGit2/test/libgit2-tests.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1082,6 +1082,14 @@ mktempdir() do dir
rethrow()
end
end

# Test GitTree constructor with GitHash
tree1 = LibGit2.GitTree(repo, "HEAD^{tree}")
tree_hash = LibGit2.GitHash(tree1)
tree2 = LibGit2.GitTree(repo, tree_hash)
@test isa(tree2, LibGit2.GitTree)
@test LibGit2.GitHash(tree1) == LibGit2.GitHash(tree2)
@test LibGit2.count(tree1) == LibGit2.count(tree2)
end
end

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