| 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 |
|
| 8 | local ffi = require("ffi") |
| 9 | local git2_error = require("git/git2_error") |
| 10 |
|
| 11 | local _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, rev) |
| 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 |
| 73 | end |
| 74 |
|
| 75 | return _M |
| 76 |
|
Index