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gut.lua
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gut.lua
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require 'third-party/path_separator'
require 'third-party/sanitize'
require 'third-party/join'
require 'third-party/mklink'
require 'third-party/abs'
local execute = require"execute"
local escape = require"escape"
local Gut = {}
local gutdir = ".gut"
local omitfile = ".gutomit"
function Gut:new(dir)
local dir, err = fs.abs(dir)
if err then
return err
end
local obj = {
dir = dir,
gutdir = fs.join(dir, gutdir)
}
self.__index = self
return setmetatable(obj, self)
end
function Gut:isrepo()
return fs.exists(self.gutdir)
end
function Gut:start()
fs.create_dir(self.gutdir)
fs.create_dir(fs.join(self.gutdir, "current"))
fs.create_dir(fs.join(self.gutdir, "patches"))
fs.touch(fs.join(self.gutdir, "series"))
fs.touch(fs.join(self.gutdir, "index"))
-- todo: check errors
end
function Gut:entries()
local err = nil
local entries = fs.entries(self.dir)
if entries == nil then
return nil, "failed to get directory entries"
end
return function()
for filename in entries do
if filename ~= gutdir then
return filename
end
end
end
end
function Gut:execute(cmd)
return execute(escape{"cd", self.gutdir} .. " && " .. escape(cmd))
end
function Gut:executerepo(cmd)
return execute(escape{"cd", self.dir} .. " && " .. escape(cmd))
end
function Gut:savecurrent()
local current, err = fs.join(self.gutdir, "current")
if err then
return err
end
local currentnew = current .. ".new"
local currentold = current .. ".old"
fs.create_dir(currentnew, true)
-- todo: check error
local entries, err = self:entries()
if err then
return err
end
for filename in entries do
local err = execute{
"cp",
"-R",
fs.join(self.dir, filename),
fs.join(currentnew, filename)
}:run()
if err then
return err
end
end
if fs.exists(current) then
-- todo: racy code
local ok, err = os.rename(current, currentold)
if err then
return err
end
end
ok, err = os.rename(currentnew, current)
if err then
return err
end
return fs.remove_recursive(currentold)
end
function Gut:diff(file)
local err = nil
local adir = fs.join(self.gutdir, "a")
local bdir = fs.join(self.gutdir, "b")
if fs.exists(bdir) then
-- todo: racy code
err = fs.remove_recursive(bdir)
if err then
return err
end
end
fs.create_dir(bdir)
-- todo: check error
local entries, err = self:entries()
if err then
return err
end
for filename in entries do
err = fs.mklink(
fs.join("../../", filename),
fs.join(bdir, filename)
)
if err then
return err
end
end
if not fs.exists(adir) then
err = fs.mklink("current", adir)
if err then
return err
end
end
local cmd
if fs.exists(fs.join(self.dir, omitfile)) then
cmd = self:execute{"diff", "--text", "--color=auto", "-X", fs.join("..", omitfile), "-Nur", "a", "b"}
else
cmd = self:execute{"diff", "--text", "--color=auto", "-Nur", "a", "b"}
end
if file then
return cmd:output(file)
else
cmd:run()
end
end
function Gut:apply(filename)
return self:executerepo{"patch", "-p1", "-i", filename}:run()
end
function Gut:series()
local f, err = io.open(fs.join(self.gutdir, "series"), "r")
if err then return nil, err end
local series = {}
for line in f:lines("l") do
if line ~= "" then
table.insert(series, line)
end
end
f:close()
return series
end
function Gut:saveseries(series)
local f, err = io.open(fs.join(self.gutdir, "series"), "w")
if err then return err end
f, err = f:write(table.concat(series, "\n"))
if err then return err end
f:close()
end
function Gut:index()
local f, err = io.open(fs.join(self.gutdir, "index"), "r")
if err then return nil, err end
local index, err = f:read("l")
f:close()
return index, err
end
function Gut:saveindex(index)
local f, err = io.open(fs.join(self.gutdir, "index"), "w")
if err then return err end
local ok, err = f:write(index)
f:close()
return err
end
function Gut:pushseries()
local series, err = self:series()
end
function Gut:patches()
local entries = fs.entries(fs.join(self.gutdir, "patches"))
if entries == nil then
return nil, "failed to get directory entries"
end
return entries
end
function Gut:savepatch(filename)
if not filename or filename == "" then
return "empty filename"
end
local patches = fs.join(self.gutdir, "patches")
local fullname = fs.join(patches, filename)
if fs.exists(fullname) then
return "patch with this name already exists"
end
local file, err = io.open(fullname, "w")
if err then
return err
end
local err = self:diff(file)
if err then
return err
end
file:close()
local series, err = self:series(filename)
if err then return err end
local index, err = self:index(filename)
if err then return err end
local pos = 1
for i, name in ipairs(series) do
if name == index then
pos = i + 1
break
end
end
table.insert(series, pos, filename)
local seriesnew = {}
for i = 1, pos do
table.insert(seriesnew, series[i])
end
err = self:saveseries(seriesnew)
if err then return err end
err = self:saveindex(filename)
if err then return err end
err = self:savecurrent()
if err then return err end
end
function Gut:revert(filename)
return self:executerepo{"patch", "-R", "-p1", "-i", filename}:run()
end
function Gut:backward()
local series, err = self:series(filename)
if err then return err end
local index, err = self:index(filename)
if err then return err end
local pos = 0
for i, name in ipairs(series) do
if name == index then
pos = i
break
end
end
local filename = series[pos]
index = series[pos - 1]
if not index then
index = ""
end
if not filename then
return "nowhere to move"
end
filename = fs.join(self.gutdir, "patches", filename)
err = self:revert(filename)
if err then return err end
err = self:saveindex(index)
if err then return err end
err = self:savecurrent()
if err then return err end
end
function Gut:forward()
local series, err = self:series(filename)
if err then return err end
local index, err = self:index(filename)
if err then return err end
local pos = 0
for i, name in ipairs(series) do
if name == index then
pos = i
break
end
end
local filename = series[pos + 1]
if not filename then
return "nowhere to move"
end
index = filename
filename = fs.join(self.gutdir, "patches", filename)
err = self:apply(filename)
if err then return err end
err = self:saveindex(index)
if err then return err end
err = self:savecurrent()
if err then return err end
end
return Gut