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resty-gitweb / c69d6c0

A git web interface for Lua/OpenResty (you're on it right now!)

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703 Jan 2021 10:11609d330libgit2 binding updates, README updatesJosh Stockin1750G

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1-- resty-gitweb@git/find_rev.lua
2-- Finds and formats a revision by name
3
4-- Copyright (c) 2020 Joshua 'joshuas3' Stockin
5-- <https://git.joshstock.in/resty-gitweb>
6-- This software is licensed under the MIT License.
7
8local ffi = require("ffi")
9local git2_error = require("git/git2_error")
10
11local _M = function(repo_obj, rev)
12 local err = 0
13 rev = rev or "HEAD"
14
15 -- Get object/reference
16 local object = ffi.new("git_object*[1]")
17 local reference = ffi.new("git_reference*[1]")
18 err = git2.git_revparse_ext(ffi.cast("git_object**", object), ffi.cast("git_reference**", reference), repo_obj, ref_name)
19 git2_error(err, "Failed to find reference")
20 object = object[0]
21 reference = reference[0]
22
23 -- Get full name if intermediate reference exists
24 local name = rev
25 if reference ~= nil then
26 local ref_type = git2.git_reference_type(reference)
27 if ref_type == git2.GIT_REFERENCE_SYMBOLIC then
28 name = ffi.string(git2.git_reference_symbolic_target(reference))
29 elseif ref_type == git2.GIT_REFERENCE_DIRECT then
30 name = ffi.string(git2.git_reference_name(reference))
31 end
32 end
33
34 -- Get OID
35 local oid = git2.git_object_id(object)
36
37 -- Format oid as SHA1 hash
38 local hash = ffi.new("char[41]") -- SHA1 length (40 chars) + \0
39 err = git2.git_oid_fmt(hash, oid)
40 git2_error(err, "Failed formatting OID")
41 hash = ffi.string(hash)
42
43 local shorthash_buf = ffi.new("git_buf")
44 err = git2.git_object_short_id(shorthash_buf, object)
45 git2_error(err, "Failed to calculate short id for object")
46 shorthash = ffi.string(shorthash_buf.ptr)
47
48 -- Free all
49 git2.git_buf_free(shorthash_buf)
50 git2.git_object_free(object)
51 if reference ~= nil then
52 git2.git_reference_free(reference)
53 end
54
55 -- Format
56 local ref = {}
57 ref.full = name
58 if name:match("^refs/heads/") then
59 ref.name = string.sub(name, 12, string.len(name))
60 elseif name:match("^refs/tags/") then
61 ref.name = string.sub(name, 11, string.len(name))
62 else
63 if rev == hash then -- input was 40-digit hex
64 ref.name = shorthash
65 else -- fallback
66 ref.name = rev -- just pass input as default output
67 end
68 end
69 ref.hash = hash
70 ref.shorthash = shorthash
71
72 return ref
73end
74
75return _M
76