[SWAT-595] Add support for multiline Field values (#85)

* Support multiline fields with escaped newlines
* Added e2e test for multiline field
* Update input description
* Added unit test

Co-authored-by: Laszlo Pusok <[email protected]>

bitrise.yml

@@ -72,17 +72,22 @@ workflows:
             #!/bin/bash
             set -ex
 
-            multi_line_msg="Multi\nline\n\ntext"
+            multi_line_msg="Multiline, with a link: https://www.bitrise.io, \n _some_ *highlight*, \n and linkify @slackbot #random"
             envman add --key SLACK_MESSAGE_FROM_SCRIPT --value "$multi_line_msg"
     - path::./:
-        title: Should escape backslash+n as newline char
+        title: Should escape backslash+n as newline char + custom multiline release notes field
         is_skippable: false
         inputs:
         - webhook_url: $SLACK_WEBHOOK_URL
         - api_token: $SLACK_API_TOKEN
         - channel: $SLACK_CHANNEL
         - from_username: step-dev-test
         - message: $SLACK_MESSAGE_FROM_SCRIPT
+        - fields: |
+            Release notes|${SLACK_MESSAGE_FROM_SCRIPT}
+            App|${BITRISE_APP_TITLE}
+            Branch|${BITRISE_GIT_BRANCH}
+            Workflow|${BITRISE_TRIGGERED_WORKFLOW_ID}
   fail-message-test:
     steps:
     - script:

message.go

@@ -130,7 +130,7 @@ func (f Field) MarshalJSON() ([]byte, error) {
 
 func parseFields(s string) (fs []Field) {
 	for _, p := range pairs(s) {
-		fs = append(fs, Field{Title: p[0], Value: p[1]})
+		fs = append(fs, Field{Title: p[0], Value: ensureNewlines(p[1])})
 	}
 	return
 }

message_test.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_parseFields(t *testing.T) {
+	tests := []struct {
+		name   string
+		s      string
+		wantFs []Field
+	}{
+		{
+			name:   "Newline in release notes",
+			s:      "Release notes|line1\\nline2",
+			wantFs: []Field{{Title: "Release notes", Value: "line1\nline2"}},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if gotFs := parseFields(tt.s); !reflect.DeepEqual(gotFs, tt.wantFs) {
+				t.Errorf("parseFields() = %v, want %v", gotFs, tt.wantFs)
+			}
+		})
+	}
+}

step.yml

@@ -332,10 +332,13 @@ inputs:
       description: |
         Fields separated by newlines and each field contains a `title` and a `value`.
         The `title` and the `value` fields are separated by a pipe `|` character.
-        Empty lines and lines without a separator are omitted.
         
         The *title* shown as a bold heading above the `value` text.
         The *value* is the text value of the field.
+        
+        Supports multiline text with escaped newlines. Example: `Release notes| - Line1 \n -Line2`.
+
+        Empty lines and lines without a separator are omitted.
   - buttons: |
       View App|${BITRISE_APP_URL}
       View Build|${BITRISE_BUILD_URL}