Support reading of multi-line jsonnet params

Signed-off-by: Jessica Yuen <im.jessicayuen@gmail.com>

metadata/params/params.go

@@ -152,6 +152,8 @@ func visitParamValue(param ast.Node) (string, error) {
 		switch n.Kind {
 		case ast.StringSingle, ast.StringDouble:
 			return fmt.Sprintf(`"%s"`, n.Value), nil
+		case ast.StringBlock:
+			return fmt.Sprintf("|||\n%s|||", n.Value), nil
 		default:
 			return "", fmt.Errorf("Found unsupported LiteralString type %T", n)
 		}
@@ -176,7 +178,21 @@ func writeParams(indent int, params Params) string {
 	var buffer bytes.Buffer
 	buffer.WriteString("\n")
 	for i, key := range keys {
-		buffer.WriteString(fmt.Sprintf("%s%s: %s,", indentBuffer.String(), key, params[key]))
+		param := params[key]
+		if strings.HasPrefix(param, "|||\n") {
+			println(param)
+
+			// every line in a block string needs to be indented
+			lines := strings.Split(param, "\n")
+			buffer.WriteString(fmt.Sprintf("%s%s: %s\n", indentBuffer.String(), key, lines[0]))
+			for i := 1; i < len(lines)-1; i++ {
+				buffer.WriteString(fmt.Sprintf("  %s%s\n", indentBuffer.String(), lines[i]))
+			}
+			buffer.WriteString(fmt.Sprintf("%s|||,", indentBuffer.String()))
+		} else {
+			// other param types
+			buffer.WriteString(fmt.Sprintf("%s%s: %s,", indentBuffer.String(), key, param))
+		}
 		if i < len(keys)-1 {
 			buffer.WriteString("\n")
 		}

metadata/params/params_test.go

@@ -296,6 +296,23 @@ func TestGetComponentParams(t *testing.T) {
 }`,
 			Params{"name": `"foo-bar"`, "replicas": "1"},
 		},
+		// Test case where one of the param values is a block string
+		{
+			"foo",
+			`
+{
+	components: {
+		"foo": {
+			name: |||
+        name
+        is
+        foo
+			|||,
+		}
+	},
+}`,
+			Params{"name": "|||\nname\nis\nfoo\n|||"},
+		},
 	}
 
 	errors := []struct {
@@ -336,18 +353,6 @@ func TestGetComponentParams(t *testing.T) {
 			name: "foo",
 		}
 	},
-}`,
-		},
-		// Test case where one of the param values is a block string
-		{
-			"foo",
-			`
-{
-	components: {
-		"foo": {
-			name: |||name is foo|||,
-		}
-	},
 }`,
 		},
 	}
@@ -566,6 +571,36 @@ local bar = import "bar";
       replicas: 5,
     },
   },
+}`,
+		},
+		// Test setting parameter for jsonnet file with multi-string field
+		{
+			"foo-bar",
+			`
+{
+  components: {
+    "foo-bar": {
+      description: |||
+        foo
+        bar
+      |||,
+      name: "foo-bar",
+    },
+  },
+}`,
+			Params{"replicas": "5"},
+			`
+{
+  components: {
+    "foo-bar": {
+      description: |||
+        foo
+        bar
+      |||,
+      name: "foo-bar",
+      replicas: 5,
+    },
+  },
 }`,
 		},
 	}
@@ -755,6 +790,9 @@ params + {
       replicas: 1,
     },
     foo +: {
+      description: |||
+        foo
+      |||,
       name: "foo",
       replicas: 1,
     },
@@ -770,6 +808,9 @@ params + {
       replicas: 1,
     },
     foo +: {
+      description: |||
+        foo
+      |||,
       name: "foobar",
       replicas: 5,
     },