feat: add command.not-found hook

so, here we use a custom function for the sh interpreter to run
individual commands now. what does this mean?
1. aliases will work not only on the 1st command, since it was
replaced in the beginning before.
want to run `cmd; alias`? now you can!
2. custom error message when a command isnt found :} i can also
add the command.not-found hook (will do in next commit)
3. sh and lua can be mixed (not in this commit, but itll work)

this means all code for handling commands is in the single `execCommand`
function in shell.go and will probably able to clean things up soon,
ditching the `RunInput` function entirely

go.mod

@@ -7,10 +7,13 @@ require (
 	github.com/bobappleyard/readline v0.0.0-20150707195538-7e300e02d38e
 	github.com/chuckpreslar/emission v0.0.0-20170206194824-a7ddd980baf9
 	github.com/pborman/getopt v1.1.0
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/sergi/go-diff v1.0.0 // indirect
+	github.com/stretchr/testify v1.4.0 // indirect
 	github.com/yuin/gopher-lua v0.0.0-20200816102855-ee81675732da
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
-	golang.org/x/sys v0.0.0-20210415045647-66c3f260301c // indirect
-	golang.org/x/term v0.0.0-20210406210042-72f3dc4e9b72
+	golang.org/x/sys v0.0.0-20210514084401-e8d321eab015 // indirect
+	golang.org/x/term v0.0.0-20210503060354-a79de5458b56
 	layeh.com/gopher-luar v1.0.8
-	mvdan.cc/sh/v3 v3.2.4
+	mvdan.cc/sh/v3 v3.3.0
 )

go.sum

@@ -7,25 +7,32 @@ github.com/chuckpreslar/emission v0.0.0-20170206194824-a7ddd980baf9/go.mod h1:2w
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.11 h1:07n33Z8lZxZ2qwegKbObQohDhXDQxiMMz1NOUGYlesw=
 github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
+github.com/google/renameio v1.0.1-0.20210406141108-81588dbe0453/go.mod h1:t/HQoYBZSsWSNK35C6CO/TpPLDVWvxOHboWUAweKUpk=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mattn/go-runewidth v0.0.12 h1:Y41i/hVW3Pgwr8gV+J23B9YEY0zxjptBuCWEaxmAOow=
 github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
 github.com/pborman/getopt v1.1.0 h1:eJ3aFZroQqq0bWmraivjQNt6Dmm5M0h2JcDW38/Azb0=
 github.com/pborman/getopt v1.1.0/go.mod h1:FxXoW1Re00sQG/+KIkuSqRL/LwQgSkv7uyac+STFsbk=
 github.com/pkg/diff v0.0.0-20200914180035-5b29258ca4f7/go.mod h1:zO8QMzTeZd5cpnIkz/Gn6iK0jDfGicM1nynOkkPIl28=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rogpeppe/go-internal v1.6.2/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
+github.com/rogpeppe/go-internal v1.7.0/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
@@ -42,9 +49,14 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210414055047-fe65e336abe0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210415045647-66c3f260301c h1:6L+uOeS3OQt/f4eFHXZcTxeZrGCuz+CLElgEBjbcTA4=
 golang.org/x/sys v0.0.0-20210415045647-66c3f260301c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210503080704-8803ae5d1324/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210514084401-e8d321eab015 h1:hZR0X1kPW+nwyJ9xRxqZk1vx5RUObAPBdKVvXPDUH/E=
+golang.org/x/sys v0.0.0-20210514084401-e8d321eab015/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20210406210042-72f3dc4e9b72 h1:VqE9gduFZ4dbR7XoL77lHFp0/DyDUBKSXK7CMFkVcV0=
 golang.org/x/term v0.0.0-20210406210042-72f3dc4e9b72/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210503060354-a79de5458b56 h1:b8jxX3zqjpqb2LklXPzKSGJhzyxCOZSz8ncv8Nv+y7w=
+golang.org/x/term v0.0.0-20210503060354-a79de5458b56/go.mod h1:tfny5GFUkzUvx4ps4ajbZsCe5lw1metzhBm9T3x7oIY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
@@ -52,5 +64,8 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 layeh.com/gopher-luar v1.0.8 h1:Uqws1Z6T0vK6pZ7ehNNurLLSFcz7+E0EOHVM4FNiMQs=
 layeh.com/gopher-luar v1.0.8/go.mod h1:TPnIVCZ2RJBndm7ohXyaqfhzjlZ+OA2SZR/YwL8tECk=
 mvdan.cc/editorconfig v0.1.1-0.20200121172147-e40951bde157/go.mod h1:Ge4atmRUYqueGppvJ7JNrtqpqokoJEFxYbP0Z+WeKS8=
+mvdan.cc/editorconfig v0.2.0/go.mod h1:lvnnD3BNdBYkhq+B4uBuFFKatfp02eB6HixDvEz91C0=
 mvdan.cc/sh/v3 v3.2.4 h1:+fZaWcXWRjYAvqzEKoDhDM3DkxdDUykU2iw0VMKFe9s=
 mvdan.cc/sh/v3 v3.2.4/go.mod h1:fPQmabBpREM/XQ9YXSU5ZFZ/Sm+PmKP9/vkFHgYKJEI=
+mvdan.cc/sh/v3 v3.3.0 h1:ujzElMnry63f4I5sjPFxzo6xia+gwsHZM0yyauuyZ6k=
+mvdan.cc/sh/v3 v3.3.0/go.mod h1:dh3avhLDhJJ/MJKzbak6FYn+DJKUWk7Fb6Dh5mGdv6Y=

preload.lua

@@ -1,10 +1,10 @@
 -- 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'
 
+-- Builtins
 commander.register('cd', function (args)
 	bait.throw('cd', args)
 	if #args > 0 then
@@ -86,3 +86,8 @@ function string.split(str, delimiter)
 	return result
 end
 
+-- Hook handles
+bait.catch('command.not-found', function(cmd)
+	print(string.format('hilbish: %s not found', cmd))
+end)
+

shell.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"strings"
+	"time"
 
 //	"github.com/bobappleyard/readline"
 	"github.com/yuin/gopher-lua"
@@ -15,18 +16,7 @@ import (
 )
 
 func RunInput(input string) {
-	cmdArgs, cmdString := splitInput(input)
-
-	// If alias was found, use command alias
-	for aliases[cmdArgs[0]] != "" {
-		alias := aliases[cmdArgs[0]]
-		cmdString = alias + strings.TrimPrefix(cmdString, cmdArgs[0])
-		cmdArgs, cmdString = splitInput(cmdString)
-
-		if aliases[cmdArgs[0]] != "" {
-			continue
-		}
-	}
+	_, cmdString := splitInput(input)
 
 	// First try to load input, essentially compiling to bytecode
 	fn, err := l.LoadString(cmdString)
@@ -49,33 +39,6 @@ func RunInput(input string) {
 		return
 	}
 
-	// If command is defined in Lua then run it
-	if commands[cmdArgs[0]] {
-		err := l.CallByParam(lua.P{
-			Fn: l.GetField(
-				l.GetTable(
-					l.GetGlobal("commanding"),
-					lua.LString("__commands")),
-				cmdArgs[0]),
-			NRet:    1,
-			Protect: true,
-		}, luar.New(l, cmdArgs[1:]))
-		luaexitcode := l.Get(-1)
-		exitcode := lua.LNumber(0)
-
-		l.Pop(1)
-
-		if code, ok := luaexitcode.(lua.LNumber); luaexitcode != lua.LNil && ok {
-			exitcode = code
-		}
-		if err != nil {
-			fmt.Fprintln(os.Stderr,
-				"Error in command:\n\n" + err.Error())
-		}
-		hooks.Em.Emit("command.exit", exitcode)
-		return
-	}
-
 	// Last option: use sh interpreter
 	err = execCommand(cmdString)
 	if err != nil {
@@ -115,8 +78,60 @@ func execCommand(cmd string) error {
 	if err != nil {
 		return err
 	}
+
+	exechandle := func(ctx context.Context, args []string) error {
+		hc := interp.HandlerCtx(ctx)
+		args, argstring := splitInput(strings.Join(args, " "))
+
+		// If alias was found, use command alias
+		for aliases[args[0]] != "" {
+			alias := aliases[args[0]]
+			argstring = alias + strings.TrimPrefix(argstring, args[0])
+			args, argstring = splitInput(argstring)
+
+			if aliases[args[0]] != "" {
+				continue
+			}
+		}
+
+		// If command is defined in Lua then run it
+		if commands[args[0]] {
+			err := l.CallByParam(lua.P{
+				Fn: l.GetField(
+					l.GetTable(
+						l.GetGlobal("commanding"),
+						lua.LString("__commands")),
+					args[0]),
+				NRet:    1,
+				Protect: true,
+			}, luar.New(l, args[1:]))
+			luaexitcode := l.Get(-1)
+			var exitcode uint8 = 0
+
+			l.Pop(1)
+
+			if code, ok := luaexitcode.(lua.LNumber); luaexitcode != lua.LNil && ok {
+				exitcode = uint8(code)
+			}
+
+			if err != nil {
+				fmt.Fprintln(os.Stderr,
+					"Error in command:\n\n" + err.Error())
+			}
+			hooks.Em.Emit("command.exit", exitcode)
+			return interp.NewExitStatus(exitcode)
+		}
+
+		if _, err := interp.LookPathDir(hc.Dir, hc.Env, args[0]); err != nil {
+			hooks.Em.Emit("command.not-found", args[0])
+			return interp.NewExitStatus(127)
+		}
+
+		return interp.DefaultExecHandler(2*time.Second)(ctx, args)
+	}
 	runner, _ := interp.New(
 		interp.StdIO(os.Stdin, os.Stdout, os.Stderr),
+		interp.ExecHandler(exechandle),
 	)
 	err = runner.Run(context.TODO(), file)