Enable FindString to search dotD config files

pkg/configfilearg/parser.go

@@ -98,28 +98,46 @@ func (p *Parser) stripInvalidFlags(command string, args []string) ([]string, err
 
 func (p *Parser) FindString(args []string, target string) (string, error) {
 	configFile, isSet := p.findConfigFileFlag(args)
+	var lastVal string
 	if configFile != "" {
-		bytes, err := readConfigFileData(configFile)
+
+		_, err := os.Stat(configFile)
 		if !isSet && os.IsNotExist(err) {
 			return "", nil
 		} else if err != nil {
 			return "", err
 		}
 
-		data := yaml.MapSlice{}
-		if err := yaml.Unmarshal(bytes, &data); err != nil {
+		files, err := dotDFiles(configFile)
+		if err != nil {
 			return "", err
 		}
+		files = append([]string{configFile}, files...)
+		for _, file := range files {
+			bytes, err := readConfigFileData(file)
+			if err != nil {
+				return "", err
+			}
 
-		for _, i := range data {
-			k, v := convert.ToString(i.Key), convert.ToString(i.Value)
-			if k == target {
-				return v, nil
+			data := yaml.MapSlice{}
+			if err := yaml.Unmarshal(bytes, &data); err != nil {
+				return "", err
+			}
+			for _, i := range data {
+				k, v := convert.ToString(i.Key), convert.ToString(i.Value)
+				isAppend := strings.HasSuffix(k, "+")
+				k = strings.TrimSuffix(k, "+")
+				if k == target {
+					if isAppend {
+						lastVal = lastVal + "," + v
+					} else {
+						lastVal = v
+					}
+				}
 			}
 		}
 	}
-
-	return "", nil
+	return lastVal, nil
 }
 
 func (p *Parser) findConfigFileFlag(args []string) (string, bool) {

pkg/configfilearg/parser_test.go

@@ -221,6 +221,7 @@ func Test_UnitParser_findConfigFileFlag(t *testing.T) {
 func Test_UnitParser_Parse(t *testing.T) {
 	testDataOutput := []string{
 		"--foo-bar=bar-foo",
+		"--alice=bob",
 		"--a-slice=1",
 		"--a-slice=1.5",
 		"--a-slice=2",
@@ -237,6 +238,7 @@ func Test_UnitParser_Parse(t *testing.T) {
 		"--c-slice=three",
 		"--d-slice=three",
 		"--d-slice=four",
+		"--f-string=beta",
 		"--e-slice=one",
 		"--e-slice=two",
 	}
@@ -376,20 +378,20 @@ func Test_UnitParser_FindString(t *testing.T) {
 			want: "",
 		},
 		{
-			name: "A custom config yaml exists, target exists",
+			name: "A custom config exists, target exists",
 			fields: fields{
 				FlagNames:     []string{"-c", "--config"},
 				EnvName:       "_TEST_ENV",
 				DefaultConfig: "./testdata/data.yaml",
 			},
 			args: args{
 				osArgs: []string{"-c", "./testdata/data.yaml"},
-				target: "foo-bar",
+				target: "alice",
 			},
-			want: "baz",
+			want: "bob",
 		},
 		{
-			name: "A custom config yaml exists, target does not exist",
+			name: "A custom config exists, target does not exist",
 			fields: fields{
 				FlagNames:     []string{"-c", "--config"},
 				EnvName:       "_TEST_ENV",
@@ -401,6 +403,45 @@ func Test_UnitParser_FindString(t *testing.T) {
 			},
 			want: "",
 		},
+		{
+			name: "Multiple custom configs exist, target exists in a secondary config",
+			fields: fields{
+				FlagNames:     []string{"-c", "--config"},
+				EnvName:       "_TEST_ENV",
+				DefaultConfig: "./testdata/data.yaml",
+			},
+			args: args{
+				osArgs: []string{"-c", "./testdata/data.yaml"},
+				target: "f-string",
+			},
+			want: "beta",
+		},
+		{
+			name: "Multiple custom configs exist, multiple targets exist in multiple secondary config, replacement",
+			fields: fields{
+				FlagNames:     []string{"-c", "--config"},
+				EnvName:       "_TEST_ENV",
+				DefaultConfig: "./testdata/data.yaml",
+			},
+			args: args{
+				osArgs: []string{"-c", "./testdata/data.yaml"},
+				target: "foo-bar",
+			},
+			want: "bar-foo",
+		},
+		{
+			name: "Multiple custom configs exist, multiple targets exist in multiple secondary config, appending",
+			fields: fields{
+				FlagNames:     []string{"-c", "--config"},
+				EnvName:       "_TEST_ENV",
+				DefaultConfig: "./testdata/data.yaml",
+			},
+			args: args{
+				osArgs: []string{"-c", "./testdata/data.yaml"},
+				target: "b-string",
+			},
+			want: "one,two",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

pkg/configfilearg/testdata/data.yaml

@@ -1,4 +1,5 @@
 foo-bar: baz
+alice: bob
 a-slice:
 - 1
 - "2"

pkg/configfilearg/testdata/data.yaml.d/01-data.yml

@@ -11,4 +11,5 @@ c-slice:
 - two
 d-slice:
 - one
-- two
+- two
+f-string: beta