Hilbish/preload.lua

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Lua
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-- The preload file initializes everything else for our shell
-- Currently it just adds our builtins
local fs = require 'fs'
local commander = require 'commander'
local bait = require 'bait'
commander.register('cd', function (args)
bait.throw('cd', args)
if #args > 0 then
local path = ''
for i = 1, #args do
path = path .. tostring(args[i]) .. ' '
end
path = path:gsub('$%$','\0'):gsub('${([%w_]+)}', os.getenv)
:gsub('$([%w_]+)', os.getenv):gsub('%z','$')
local ok, err = pcall(function() fs.cd(path) end)
if not ok then
if err == 1 then
print('directory does not exist')
end
return err
end
return
end
fs.cd(os.getenv 'HOME')
bait.throw('command.exit', 0)
end)
commander.register('exit', function()
os.exit(0)
end)
do
local virt_G = { }
setmetatable(_G, {
__index = function (self, key)
local got_virt = virt_G[key]
if got_virt ~= nil then
return got_virt
end
virt_G[key] = os.getenv(key)
return virt_G[key]
end,
__newindex = function (self, key, value)
if type(value) == 'string' then
os.setenv(key, value)
virt_G[key] = value
else
if type(virt_G[key]) == 'string' then
os.setenv(key, '')
end
virt_G[key] = value
end
end,
})
bait.catch('command.exit', function ()
for key, value in pairs(virt_G) do
if type(value) == 'string' then
virt_G[key] = os.getenv(key)
end
end
end)
end
2021-05-01 05:08:20 +00:00
-- Function additions to Lua standard library
function string.split(str, delimiter)
local result = {}
local from = 1
local delim_from, delim_to = string.find(str, delimiter, from)
while delim_from do
table.insert(result, string.sub(str, from, delim_from - 1))
from = delim_to + 1
delim_from, delim_to = string.find(str, delimiter, from)
end
table.insert(result, string.sub(str, from))
return result
end