add context.appRevisionNum (#1466)

docs/en/cue/component.md

@@ -209,6 +209,7 @@ output: {
 | Context Variable  | Description |
 | :--: | :---------: |
 | `context.appRevision` | The revision of the application |
+| `context.appRevisionNum` | The revision number(`int` type) of the application, e.g., `context.appRevisionNum` will be `1` if `context.appRevision` is `app-v1`|
 | `context.appName` | The name of the application |
 | `context.name` | The name of the component of the application |
 | `context.namespace` | The namespace of the application |

pkg/dsl/process/handle.go

@@ -38,6 +38,8 @@ const (
 	ContextAppName = "appName"
 	// ContextAppRevision is the revision name of app of context
 	ContextAppRevision = "appRevision"
+	// ContextAppRevisionNum is the revision num of app of context
+	ContextAppRevisionNum = "appRevisionNum"
 	// ContextNamespace is the namespace of the app
 	ContextNamespace = "namespace"
 	// OutputSecretName is used to store all secret names which are generated by cloud resource components
@@ -128,6 +130,7 @@ func (ctx *templateContext) BaseContextFile() string {
 	buff += fmt.Sprintf(ContextName+": \"%s\"\n", ctx.name)
 	buff += fmt.Sprintf(ContextAppName+": \"%s\"\n", ctx.appName)
 	buff += fmt.Sprintf(ContextAppRevision+": \"%s\"\n", ctx.appRevision)
+	buff += fmt.Sprintf(ContextAppRevisionNum+": %s\n", extractRevisionNum(ctx.appRevision))
 	buff += fmt.Sprintf(ContextNamespace+": \"%s\"\n", ctx.namespace)
 
 	if ctx.base != nil {
@@ -223,3 +226,9 @@ func structMarshal(v string) string {
 	}
 	return fmt.Sprintf("{%s}", v)
 }
+
+func extractRevisionNum(appRevision string) string {
+	app := strings.Split(appRevision, "-")
+	vision := app[len(app)-1]
+	return strings.Replace(vision, "v", "", 1)
+}

pkg/dsl/process/handle_test.go

@@ -91,6 +91,10 @@ image: "myserver"
 	assert.Equal(t, nil, err)
 	assert.Equal(t, "myapp-v1", myAppRevision)
 
+	myAppRevisionNum, err := ctxInst.Lookup("context", ContextAppRevisionNum).Int64()
+	assert.Equal(t, nil, err)
+	assert.Equal(t, int64(1), myAppRevisionNum)
+
 	inputJs, err := ctxInst.Lookup("context", OutputFieldName).MarshalJSON()
 	assert.Equal(t, nil, err)
 	assert.Equal(t, `{"image":"myserver"}`, string(inputJs))
@@ -107,3 +111,29 @@ image: "myserver"
 	assert.Equal(t, nil, err)
 	assert.Equal(t, "{\"password\":\"123\"}", string(requiredSecrets))
 }
+
+func TestExtractRevisionNum(t *testing.T) {
+	testcases := []struct {
+		appRevision     string
+		wantRevisionNum string
+	}{{
+		appRevision:     "myapp-v1",
+		wantRevisionNum: "1",
+	}, {
+		appRevision:     "new-app-v2",
+		wantRevisionNum: "2",
+	}, {
+		appRevision:     "v1-v10",
+		wantRevisionNum: "10",
+	}, {
+		appRevision:     "v10-v1-v1",
+		wantRevisionNum: "1",
+	}, {
+		appRevision:     "myapp-v1-v2",
+		wantRevisionNum: "2",
+	}}
+
+	for _, tt := range testcases {
+		assert.Equal(t, tt.wantRevisionNum, extractRevisionNum(tt.appRevision))
+	}
+}