zsh fixes (zmodload, k8s, new var type, track zsh prompt) (#473)

* checkpoint.  track zmodloads, get the expanded PS1 value, change how we store and deal with 'prompt vars', add commands to track k8s context

* fix some warnings, change IsPVar to IsExtVar, checkpoint

* parse zmodloads into state

* restore zmodloads, be more careful around readonly variable setting to avoid errors

waveshell/pkg/utilfn/utilfn.go

@@ -7,6 +7,7 @@ import (
 	"bytes"
 	"crypto/sha1"
 	"encoding/base64"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"math"
@@ -400,7 +401,7 @@ func DecodeStringArray(barr []byte) ([]string, error) {
 	return rtn, nil
 }
 
-func EncodedStringArrayHasFirstKey(encoded []byte, firstKey string) bool {
+func EncodedStringArrayHasFirstVal(encoded []byte, firstKey string) bool {
 	firstKeyBytes := NullEncodeStr(firstKey)
 	if !bytes.HasPrefix(encoded, firstKeyBytes) {
 		return false
@@ -411,6 +412,18 @@ func EncodedStringArrayHasFirstKey(encoded []byte, firstKey string) bool {
 	return false
 }
 
+// on encoding error returns ""
+// this is used to perform logic on first value without decoding the entire array
+func EncodedStringArrayGetFirstVal(encoded []byte) string {
+	sepIdx := bytes.IndexByte(encoded, nullEncodeSepByte)
+	if sepIdx == -1 {
+		str, _ := NullDecodeStr(encoded)
+		return str
+	}
+	str, _ := NullDecodeStr(encoded[0:sepIdx])
+	return str
+}
+
 // encodes a string, removing null/zero bytes (and separators '|')
 // a zero byte is encoded as "\0", a '\' is encoded as "\\", sep is encoded as "\s"
 // allows for easy double splitting (first on \x00, and next on "|")
@@ -520,3 +533,22 @@ func CombineStrArrays(sarr1 []string, sarr2 []string) []string {
 	}
 	return rtn
 }
+
+func QuickJson(v interface{}) string {
+	barr, _ := json.Marshal(v)
+	return string(barr)
+}
+
+func QuickParseJson[T any](s string) T {
+	var v T
+	_ = json.Unmarshal([]byte(s), &v)
+	return v
+}
+
+func StrArrayToMap(sarr []string) map[string]bool {
+	m := make(map[string]bool)
+	for _, s := range sarr {
+		m[s] = true
+	}
+	return m
+}