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local pprint=require"pprint"
pprint.setup{show_all=true,use_tostring=true}
local repl_env = {}
local function reload(modname)
local oldmod = require(modname)
assert(type(oldmod) == "table","reloading only works on modules that return tables")
package.loaded[modname] = nil
local newmod = require(modname)
package.loaded[modname]=oldmod
assert(type(newmod) == "table","new module doesn't seem to be a table, cancelling")
for k in pairs(oldmod) do oldmod[k] = nil end
for k,v in pairs(newmod) do oldmod[k] = v end
end
-- should use loadstring on 5.1
-- works on luajit though
local function load_chunk(s)
return load(s,"repl","t")
end
local function prompt(p)
io.write(p)
return io.read()
end
local function read_chunk()
-- try with return
-- if that doesn't work try without return
-- if error ends in <eof> try multiline
local function try(text)
if text == nil then
os.exit()
end
if text:sub(1,3) == ",r " then
return function() reload(text:sub(4)) print("reloaded "..text:sub(4)) end
end
local f, err = load_chunk("return "..text..";")
if f then return f end
local f, err = load_chunk(text)
if f then return f end
if err:sub(-5) == "<eof>" or err:sub(-7) == "'<eof>'" then
local nt = text.."\n"..prompt("} ")
return try(nt)
end
return f, err
end
return try(prompt("] "))
end
local function result(ok,...)
if ok then
pprint(...)
else
print("error: "..(...))
end
end
io.write("lua_repl_good for ".._VERSION)
if jit then io.write(" ("..jit.version..")") end
io.write"\n"
while true do
local f,err = read_chunk()
if not f then
print("load error: "..err)
else
result(xpcall(f,function(e) return debug.traceback(e,1) end))
end
end
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