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-- gall.object
--
-- Git Abstraction Layer for Lua -- Generic object interface
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
--
---
-- Generic object interface
--
-- @module gall.object
local ll = require "gall.ll"
local commit = require "gall.commit"
local tree = require "gall.tree"
local tag = require "gall.tag"
local repos = setmetatable({}, {__mode="k"})
local blobs = setmetatable({}, {__mode="k"})
local known_types = {
blob = true, commit = true, tree = true, tag = true,
}
local function _objectindex(obj, field)
local ok, ret
local blob = blobs[obj]
if field == "type" then
if blob then
ok, ret = 0, ll.git2.get_object_type(blob)
else
ok, ret = repos[obj]:gather("cat-file", "-t", obj.sha)
end
elseif field == "size" then
if blob then
ok, ret = 0, ll.git2.get_object_size(blob)
else
ok, ret = repos[obj]:gather("cat-file", "-s", obj.sha)
end
elseif field == "raw" then
if blob and obj.type ~= "tree" then
ok, ret = 0, ll.git2.get_object_raw(blob)
else
ok, ret = repos[obj]:rawgather("cat-file", (obj.type == "tag" and "tag" or "-p"), obj.sha)
end
elseif field == "content" then
assert(known_types[obj.type], "Unknown type: " .. obj.type)
if obj.type == "blob" then
ok, ret = 0, obj.raw
elseif obj.type == "commit" then
ok, ret = 0, commit.new(repos[obj], obj)
elseif obj.type == "tree" then
ok, ret = 0, tree.new(repos[obj], obj)
elseif obj.type == "tag" then
ok, ret = 0, tag.new(repos[obj], obj)
end
else
error("Unknown field <" .. tostring(field) .. ">")
end
assert(ok == 0, "Unable to retrieve " .. field)
if field == "size" then ret = tonumber(ret) end
rawset(obj, field, ret)
return ret
end
function _objecttostring(obj)
return "<GitObject(" .. tostring(obj.sha)..") in " .. tostring(repos[obj]) .. ">"
end
local objectmeta = {
__index = _objectindex,
__tostring = _objecttostring
}
---
-- Low level git object
--
-- @type object
---
-- The type of the object
--
-- @field type
---
-- The size of the object
--
-- @field size
---
-- The object's raw content
--
-- @field raw
---
-- The object's processed content.
--
-- * If the object is a commit, then this will be a @{commit} instance.
-- * If the object is a tree, then this will be a @{tree} instance.
-- * If the object is a tag, then this will be a @{tag} instance.
--
-- @field content
---
-- The object's OID (SHA1)
--
-- @field sha
--- @section end
---
-- Create a new raw object.
--
-- Create a new instance of @{object} referring to the given SHA1 OID.
--
-- @function new
-- @tparam repository repo The repository within which the object resides.
-- @tparam string sha The SHA1 OID of the object in the repository.
-- @treturn object The object instance encapsulating the given object.
local function _new(repo, sha)
local ret = setmetatable({sha=sha}, objectmeta)
repos[ret] = repo
if ll.git2 then
blobs[ret] = ll.git2.get_object(repo.git2.repo, sha)
end
return ret
end
---
-- Create a new raw object.
--
-- Create a new raw object and insert it into the given repository. This will
-- not only create the @{object} instance but also insert it into the
-- repository storage.
--
-- @function create
-- @tparam repository repo The repository within which the object resides.
-- @tparam string type The type of the object (e.g. blob or commit)
-- @tparam string content The content to insert as the object's content.
-- @treturn[1] object The object instance encapsulating the given object.
-- @treturn[2] nil Nil on error
-- @treturn[2] string The error message
local function _create(repo, type, content)
local why, sha =
repo:_run_with_input(content, ll.chomp,
"hash-object", "-t", type, "-w", "--stdin")
if why ~= 0 then
return nil, "hash-object returned " .. tostring(why)
end
return _new(repo, sha)
end
return {
new = _new,
create = _create,
}
|
