Hilbish/lua.go

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package main
import (
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"fmt"
"os"
"os/exec"
"strings"
"syscall"
"time"
"hilbish/golibs/bait"
"hilbish/golibs/commander"
"hilbish/golibs/fs"
"hilbish/golibs/terminal"
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"github.com/yuin/gopher-lua"
"layeh.com/gopher-luar"
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)
var minimalconf = `prompt '& '`
func LuaInit() {
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l = lua.NewState()
l.OpenLibs()
l.SetGlobal("prompt", l.NewFunction(hshprompt))
l.SetGlobal("multiprompt", l.NewFunction(hshmlprompt))
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l.SetGlobal("alias", l.NewFunction(hshalias))
l.SetGlobal("appendPath", l.NewFunction(hshappendPath))
l.SetGlobal("prependPath", l.NewFunction(hshprependPath))
l.SetGlobal("exec", l.NewFunction(hshexec))
l.SetGlobal("goro", luar.New(l, hshgoroutine))
l.SetGlobal("timeout", luar.New(l, hshtimeout))
l.SetGlobal("interval", l.NewFunction(hshinterval))
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// yes this is stupid, i know
l.PreloadModule("hilbish", HilbishLoader)
l.DoString("hilbish = require 'hilbish'")
// Add fs and terminal module module to Lua
l.PreloadModule("fs", fs.Loader)
l.PreloadModule("terminal", terminal.Loader)
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cmds := commander.New()
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// When a command from Lua is added, register it for use
cmds.Events.On("commandRegister", func(cmdName string, cmd *lua.LFunction) {
commands[cmdName] = cmd
})
cmds.Events.On("commandDeregister", func(cmdName string) {
delete(commands, cmdName)
})
l.PreloadModule("commander", cmds.Loader)
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hooks = bait.New()
l.PreloadModule("bait", hooks.Loader)
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// Add Ctrl-C handler
hooks.Em.On("signal.sigint", func() {
if !interactive {
os.Exit(0)
}
})
l.SetGlobal("complete", l.NewFunction(hshcomplete))
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// Add more paths that Lua can require from
l.DoString("package.path = package.path .. " + requirePaths)
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err := l.DoFile("preload.lua")
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if err != nil {
err = l.DoFile(preloadPath)
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if err != nil {
fmt.Fprintln(os.Stderr,
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"Missing preload file, builtins may be missing.")
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}
}
}
func RunConfig(confpath string) {
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if !interactive {
return
}
err := l.DoFile(confpath)
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if err != nil {
fmt.Fprintln(os.Stderr, err,
"\nAn error has occured while loading your config! Falling back to minimal default config.")
l.DoString(minimalconf)
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}
}
func RunLogin() {
if _, err := os.Stat(homedir + "/.hprofile.lua"); os.IsNotExist(err) {
return
}
if !login {
return
}
err := l.DoFile(homedir + "/.hprofile.lua")
if err != nil {
fmt.Fprintln(os.Stderr, err,
"\nAn error has occured while loading your login config!n")
}
}
/* prompt(str)
Changes the shell prompt to `str`
There are a few verbs that can be used in the prompt text.
These will be formatted and replaced with the appropriate values.
`%d` - Current working directory
`%u` - Name of current user
`%h` - Hostname of device */
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func hshprompt(L *lua.LState) int {
prompt = L.CheckString(1)
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return 0
}
// multiprompt(str)
// Changes the continued line prompt to `str`
func hshmlprompt(L *lua.LState) int {
multilinePrompt = L.CheckString(1)
return 0
}
// alias(cmd, orig)
// Sets an alias of `orig` to `cmd`
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func hshalias(L *lua.LState) int {
alias := L.CheckString(1)
source := L.CheckString(2)
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aliases[alias] = source
return 1
}
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// appendPath(dir)
// Appends `dir` to $PATH
func hshappendPath(L *lua.LState) int {
dir := L.CheckString(1)
dir = strings.Replace(dir, "~", curuser.HomeDir, 1)
pathenv := os.Getenv("PATH")
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// if dir isnt already in $PATH, add it
if !strings.Contains(pathenv, dir) {
os.Setenv("PATH", pathenv + string(os.PathListSeparator) + dir)
}
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return 0
}
// exec(cmd)
// Replaces running hilbish with `cmd`
func hshexec(L *lua.LState) int {
cmd := L.CheckString(1)
cmdArgs, _ := splitInput(cmd)
cmdPath, err := exec.LookPath(cmdArgs[0])
if err != nil {
fmt.Println(err)
// if we get here, cmdPath will be nothing
// therefore nothing will run
}
// syscall.Exec requires an absolute path to a binary
// path, args, string slice of environments
// TODO: alternative for windows
syscall.Exec(cmdPath, cmdArgs, os.Environ())
return 0 // random thought: does this ever return?
}
// goro(fn)
// Puts `fn` in a goroutine
func hshgoroutine(gofunc func()) {
go gofunc()
}
// timeout(cb, time)
// Runs the `cb` function after `time` in milliseconds
func hshtimeout(timeoutfunc func(), ms int) {
timeout := time.Duration(ms) * time.Millisecond
time.Sleep(timeout)
timeoutfunc()
}
// interval(cb, time)
// Runs the `cb` function every `time` milliseconds
func hshinterval(L *lua.LState) int {
intervalfunc := L.CheckFunction(1)
ms := L.CheckInt(2)
interval := time.Duration(ms) * time.Millisecond
ticker := time.NewTicker(interval)
stop := make(chan lua.LValue)
go func() {
for {
select {
case <-ticker.C:
if err := L.CallByParam(lua.P{
Fn: intervalfunc,
NRet: 0,
Protect: true,
}); err != nil {
fmt.Fprintln(os.Stderr,
"Error in interval function:\n\n", err)
}
case <-stop:
ticker.Stop()
return
}
}
}()
L.Push(lua.LChannel(stop))
return 1
}
// complete(scope, cb)
// Registers a completion handler for `scope`.
// A `scope` is currently only expected to be `command.<cmd>`,
// replacing <cmd> with the name of the command (for example `command.git`).
// `cb` must be a function that returns a table of the entries to complete.
// Nested tables will be used as sub-completions.
func hshcomplete(L *lua.LState) int {
scope := L.CheckString(1)
cb := L.CheckFunction(2)
luaCompletions[scope] = cb
return 0
}
// prependPath(dir)
// Prepends `dir` to $PATH
func hshprependPath(L *lua.LState) int {
dir := L.CheckString(1)
dir = strings.Replace(dir, "~", curuser.HomeDir, 1)
pathenv := os.Getenv("PATH")
// if dir isnt already in $PATH, add in
if !strings.Contains(pathenv, dir) {
os.Setenv("PATH", dir + string(os.PathListSeparator) + pathenv)
}
return 0
}