path: root/auto.Complete.go

package prep

// initializes logging and command line options

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	"go.wit.com/dev/alexflint/arg"
	"go.wit.com/lib/config"
	"go.wit.com/log"
)

// todo: move everything to this?
func (pb *Auto) Autocomplete3(sendthis []string) {
	pb.Autocomplete2(strings.Join(sendthis, " "))
}

func (pb *Auto) Autocomplete2(sendthis string) {
	dur := pb.Duration.AsDuration()
	if dur < time.Millisecond*200 {
		pb.Debug = true
		/*
			pb.Debugf("TODO: show extended help here '%s' '%s' %v dur=%v\n", pb.Arg0, pb.Arg1, pb.Argv, config.FormatDuration(dur))
			pb.PrintDebug()
			fmt.Println(" ")
		*/
		if myAuto.pp == nil {
			pb.Debugf("myAuto.pp == nil")
		} else {
			pb.Debugf("myAuto.pp != nil")
			if pb.Cmd == "" {
				myAuto.pp.WriteHelp(os.Stderr)
			} else {
				myAuto.pp.WriteHelpForSubcommand(os.Stderr, pb.Cmd)
			}
		}
	}

	parts := strings.Split(sendthis, " ")
	var all []string
	for _, part := range parts {
		var found bool
		for _, s := range os.Args {
			if s == part {
				found = true
			}
		}
		if found {
			continue
		}
		all = append(all, part)
	}
	fmt.Printf("%s", strings.Join(all, " "))
	/*
		if dur > time.Millisecond*200 {
			if dur < time.Millisecond*800 {
				// fmt.Println("a b")
				fmt.Println(pb.Partial + " hello world")
			}
		}
	*/
}

func parseArgv(argname string) *Auto {
	pb := new(Auto)
	pb.Argname = argname
	if len(os.Args) == 0 {
		return pb
	}

	if len(os.Args) > 1 && os.Args[1] == "--bash" {
		pb.SetupAuto = true
		return pb
	}

	// HACK: set debug flag if --autodebug is passed
	for _, s := range os.Args {
		if s == "--autodebug" {
			pb.Debug = true
		}
	}

	// "complete -C /usr/bin/argv forge" bash ENV values:
	//    * `COMP_LINE`: A string containing the entire current command line (forge first second third forth ). This is what you are looking for.
	//    * `COMP_POINT`: A number indicating the cursor's position (index) within the COMP_LINE.
	//    * `COMP_WORDS`: An array in Bash (seen differently by Go) containing each individual word on the command line.
	//    * `COMP_CWORD`: A number indicating the index of the word the cursor is currently on within the COMP_WORDS array.
	if len(os.Args) > 1 && os.Args[1] == pb.Argname {
		pb.IsAuto = true
		parts := strings.Split(os.Getenv("COMP_LINE"), " ")
		pb.Debug = true
		log.Fprintf(os.Stderr, "\n")
		pb.Debugf("MATCH Partial os.Args=%v COMP_LINE=%v", os.Args, os.Getenv("COMP_LINE"))
		// log.Fprintf(os.Stdout, "jcarr")
		if len(parts) > 0 {
			pb.Arg0 = parts[0]
		}
		pb.Arg1 = os.Args[1]
		os.Exit(0)
	}

	if len(os.Args) > 1 && os.Args[1] == "--version" {
		if myAuto.buildtime != nil {
			// if binary defined buildtime() then process standard version output here
			doVersion(pb)
			os.Exit(0)
		}
	}
	if len(os.Args) == 0 {
		return pb
	}

	if len(os.Args) == 1 {
		pb.Arg0 = os.Args[0]
		return pb
	}
	if os.Args[1] != "--auto-complete" {
		pb.Cmd = os.Args[1]
		return pb
	}

	// should we do auto complete here?
	if len(os.Args) > 1 && os.Args[1] == "--auto-complete" {
		pb.IsAuto = true
		pb.Arg0 = os.Args[0]
		pb.Arg1 = os.Args[1]
		pb.Partial = os.Args[2]
		pb.Arg3 = os.Args[3]
		if len(os.Args) < 5 {
			// the user is doing autocomplete on the command itself
			pb.Partial = ""
			pb.Cmd = ""
			pb.Argv = []string{""}
			return pb
		}
		if pb.Partial == "''" {
			pb.Partial = ""
		}
		// pb.Argv = os.Args[4:]
		for _, s := range os.Args[4:] {
			if s == "--autodebug" {
				continue
			}
			tmp := strings.Trim(pb.Partial, "'")
			if tmp == s {
				// don't put pb.Partial into Argv
				continue
			}
			pb.Argv = append(pb.Argv, s)
		}
		// set pb.Cmd to the first thing that doesn't have a '-' arg
		for _, s := range pb.Argv {
			if strings.HasPrefix(s, "-") {
				continue
			}
			pb.Cmd = s
			break
		}
		if pb.Partial == "'"+pb.Cmd+"'" {
			// not really a command, it's just a partially inputed string from the user
			pb.Cmd = ""
		}
		// try to figure out what the last argv is
		for _, s := range pb.Argv {
			p := fmt.Sprintf("'%s'", s)
			if pb.Partial == p {
				pb.Debugf("DEBUG: Last argv MATCHES Partial %s %s", s, p)
				continue
			} else {
				pb.Debugf("DEBUG: Last argv DOES NOT MATCH Partial %s %s", s, p)
			}
			pb.Last = s
			if strings.HasPrefix(s, "-") {
				// skip args like -test --verbose when sending subcommands to go-args for help text
				continue
			}
			pb.Goargs = append(pb.Goargs, s)
		}
		// if pb.Cmd == "" {
		// 	pb.Cmd = strings.Join(pb.Argv, "BLAH")
		// }
	}
	return pb
}

func Bash3(dest any) *Auto {
	return Bash(dest)
}

func Bash(dest any) *Auto {
	myAuto = new(AutoArgs)
	findAppInfo(dest) // parses back to main() for argv info

	pb := parseArgv(myAuto.appName)
	if pb.SetupAuto {
		// --bash was passed. try to configure bash-completion
		doBash(myAuto.appName)
		os.Exit(0)
	}

	myAuto.match = make(map[string]string)
	myAuto.match["--gui"] = "andlabs gocui"

	if pb.Debug {
		// dump debug info
		pb.PrintDebug()
	}

	pb.doHandlePB() // read in the history protobuf file

	// turn on debugging if duration < 200 milliseconds
	dur := pb.Duration.AsDuration()
	if dur < time.Millisecond*200 {
		pb.Debug = true
	}

	// prepart["--gui"] = "andlabs gocui"

	arg.Register(&argBash)
	flags := []string{}
	for _, s := range pb.Argv {
		if s == "--autodebug" {
			continue
		}
		flags = append(flags, s)
	}
	// pb.Debug = true
	// pb.Debugf("DEBUG: MustParse(%v)", flags)
	var err error
	myAuto.pp, err = arg.ParseFlags(flags, dest)
	if err != nil {
		pb.Debugf("DEBUG: Parse error: %v", err)
	}

	if myAuto.pp == nil {
		pb.Debugf("DEBUG: myAuto.pp == nil after ParseFlags()")
	} else {
		// pb.Debugf("DEBUG: myAuto.pp is ok after ParseFlags()")
	}

	if pb.IsAuto {
		for key, val := range myAuto.match {
			if pb.Last == key {
				pb.Debugf("DEBUG: last=%s found key %s = %s", pb.Last, key, val)
				pb.Autocomplete2(val)
				os.Exit(0)
			} else {
				// pb.Debugf("DEBUG: NO MATCH last='%s' found key '%s' = %s", pb.Last, key, val)
			}
		}
		if myAuto.autoFunc == nil {
			pb.SubCommand(pb.Argv...)
		} else {
			myAuto.autoFunc(pb) // run the autocomplete function the user made for their application
		}
		if pb.Debug {
			// TODO:
			// check here to see if there was any completion text sent
			// if not, send "reset bash newline\n" to cause bash to redraw PS1 for the user
		}
		os.Exit(0)
	}

	arg.Register(&argBash)
	myAuto.pp = arg.MustParse(dest)
	return pb
}

// makes a bash autocomplete file for your command
func doBash(argname string) {
	fmt.Println(makeBashCompletionText2(argname))

	homeDir, err := os.UserHomeDir()
	if err != nil {
		log.Printf("# %v\n", err)
		os.Exit(0)
	}
	filename := filepath.Join(homeDir, ".local/share/bash-completion/completions", argname)
	if config.Exists(filename) {
		log.Fprintln(os.Stderr, "# file already exists", filename)
		// os.Exit(0)
	}
	basedir, _ := filepath.Split(filename)
	if !config.IsDir(basedir) {
		os.MkdirAll(basedir, os.ModePerm)
	}

	if f, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644); err == nil {
		f.Write([]byte(makeBashCompletionText2(argname)))
		f.Close()
	} else {
		log.Fprintln(os.Stderr, "# open file error", filename, err)
	}
	os.Exit(0)
}