checking in before refactoring interpolation

internal/utils.go

@@ -2,6 +2,7 @@ package internal
 
 import (
 	`runtime`
+	`strings`
 )
 
 // GetPathEnvName gets the OS-specific path environment variable name.
@@ -16,3 +17,85 @@ func GetPathEnvName() (envVarName string) {
 
 	return
 }
+
+/*
+	StringToMap takes string s, assumed to be in the form of
+		key=value[,key=value,key=value...]
+	and returns a map[string]string (map[key]value).
+	It is proccessed in order; later duplicate keys overwrite previous ones.
+
+	If s is an empty string or comprised only of whitespace, m will be nil.
+	If only a key is provided with no value, the value in the map will be an empty string.
+	(e.g. "foo,bar=baz" => map[string]string{"foo": "", "bar: "baz"}
+
+	Surrounding whitespace is trimmed.
+*/
+func StringToMap(s string) (m map[string]string) {
+
+	var kvSplit []string
+	var valSplit []string
+	var k string
+	var v string
+
+	if strings.TrimSpace(s) == "" {
+		return
+	}
+
+	kvSplit = strings.Split(s, ",")
+	if kvSplit == nil || len(kvSplit) == 0 {
+		return
+	}
+	for _, kv := range kvSplit {
+		valSplit = strings.SplitN(kv, "=", 2)
+		if valSplit == nil || len(valSplit) == 0 {
+			continue
+		}
+		k = valSplit[0]
+		switch len(valSplit) {
+		case 1:
+			v = ""
+		case 2:
+			v = valSplit[1]
+			// It's not possible to have more than 2.
+		}
+		if m == nil {
+			m = make(map[string]string)
+		}
+		k = strings.TrimSpace(k)
+		v = strings.TrimSpace(v)
+		m[k] = v
+	}
+
+	return
+}
+
+/*
+	StringToMapBool is like StringToMap but designed for a map of booleans.
+	It takes string s, assumed to be in the form of
+		option[,option,option...]
+	and returns a map[string]bool (map[option]true).
+
+	If s is an empty string or comprised only of whitespace, m will be nil.
+
+	Surrounding whitespace is trimmed.
+*/
+func StringToMapBool(s string) (m map[string]bool) {
+
+	var optSplit []string
+
+	if strings.TrimSpace(s) == "" {
+		return
+	}
+
+	optSplit = strings.Split(s, ",")
+	if optSplit == nil || len(optSplit) == 0 {
+		return
+	}
+	m = make(map[string]bool)
+	for _, o := range optSplit {
+		o = strings.TrimSpace(o)
+		m[o] = true
+	}
+
+	return
+}