Variables: Adds support for key/value mapping in Custom variable (#27829)

* Initial work on adding new mapping variable type

* Remove add button

* Update custom variable type to include key/value mapping

* Update custom variable docs

* Try to fix failing build

* Update reducer.ts

* Fix failing build

* Remove expansion of the colon

* Update docs

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/variables/variable-types/add-custom-variable.md

@@ -26,7 +26,7 @@ For example, if you have server names or region names that never change, then yo
 
 ## Enter Custom Options
 
-1. In the **Values separated by comma** list, enter the values for this variable in a comma-separated list. You can include numbers, strings, or other variables.
+1. In the **Values separated by comma** list, enter the values for this variable in a comma-separated list. You can include numbers, strings, other variables or key/value pairs separated by a colon.
 1. (optional) Enter [Selection Options]({{< relref "../variable-selection-options.md" >}}).
 1. In **Preview of values**, Grafana displays a list of the current variable values. Review them to ensure they match what you expect.
 1. Click **Add** to add the variable to the dashboard.

public/app/features/variables/custom/CustomVariableEditor.tsx

@@ -50,7 +50,7 @@ class CustomVariableEditorUnconnected extends PureComponent<Props> {
               value={this.props.variable.query}
               onChange={this.onChange}
               onBlur={this.onBlur}
-              placeholder="1, 10, 20, myvalue, escaped\,value"
+              placeholder="1, 10, mykey : myvalue, myvalue, escaped\,value"
               required
               aria-label="Variable editor Form Custom Query field"
             />

public/app/features/variables/custom/reducer.test.ts

@@ -12,7 +12,7 @@ describe('customVariableReducer', () => {
 
   describe('when createCustomOptionsFromQuery is dispatched', () => {
     it('then state should be correct', () => {
-      const query = 'a,b,c';
+      const query = 'a,b,c,d:e';
       const id = '0';
       const { initialState } = getVariableTestContext(adapter, { id, query });
       const payload = toVariablePayload({ id: '0', type: 'custom' });
@@ -39,6 +39,11 @@ describe('customVariableReducer', () => {
                 value: 'c',
                 selected: false,
               },
+              {
+                text: 'd',
+                value: 'e',
+                selected: false,
+              },
             ],
           } as CustomVariableModel,
         });
@@ -47,7 +52,7 @@ describe('customVariableReducer', () => {
 
   describe('when createCustomOptionsFromQuery is dispatched and query contains spaces', () => {
     it('then state should be correct', () => {
-      const query = 'a,  b,   c';
+      const query = 'a,  b,   c, d :    e';
       const id = '0';
       const { initialState } = getVariableTestContext(adapter, { id, query });
       const payload = toVariablePayload({ id: '0', type: 'constant' });
@@ -74,6 +79,11 @@ describe('customVariableReducer', () => {
                 value: 'c',
                 selected: false,
               },
+              {
+                text: 'd',
+                value: 'e',
+                selected: false,
+              },
             ],
           } as CustomVariableModel,
         });
@@ -82,7 +92,7 @@ describe('customVariableReducer', () => {
 
   describe('when createCustomOptionsFromQuery is dispatched and includeAll is true', () => {
     it('then state should be correct', () => {
-      const query = 'a,b,c';
+      const query = 'a,b,c,d:e';
       const id = '0';
       const { initialState } = getVariableTestContext(adapter, { id, query, includeAll: true });
       const payload = toVariablePayload({ id: '0', type: 'constant' });
@@ -114,6 +124,11 @@ describe('customVariableReducer', () => {
                 value: 'c',
                 selected: false,
               },
+              {
+                text: 'd',
+                value: 'e',
+                selected: false,
+              },
             ],
           } as CustomVariableModel,
         });

public/app/features/variables/custom/reducer.ts

@@ -36,10 +36,15 @@ export const customVariableSlice = createSlice({
       const instanceState = getInstanceState<CustomVariableModel>(state, action.payload.id);
       const { includeAll, query } = instanceState;
       const match = query.match(/(?:\\,|[^,])+/g) ?? [];
-
       const options = match.map(text => {
         text = text.replace(/\\,/g, ',');
+        const textMatch = text.match(/(?:\\:|[^:])+/g) ?? [];
+        if (textMatch.length > 1) {
+          const [key, value] = textMatch;
+          return { text: key.trim(), value: value.trim(), selected: false };
+        } else {
           return { text: text.trim(), value: text.trim(), selected: false };
+        }
       });
 
       if (includeAll) {