src/goModifytags: support gomodifytags's --template flag

Support gomodifytags 1.11.0 new --template feature

As of [1.11.0](https://github.com/fatih/gomodifytags/releases/tag/v1.11.0) there is a `--template` option in gomofidytags that allows to give a special formatting to the tags, this adds support to it.

Change-Id: I94949bbfa87941a4b04b5671e728442a849e0e5e
GitHub-Last-Rev: b26a2a6
GitHub-Pull-Request: golang#826
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/264299
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Suzy Mueller <[email protected]>
Trust: Suzy Mueller <[email protected]>
Trust: Hyang-Ah Hana Kim <[email protected]>

.vscode/settings.json

@@ -11,4 +11,4 @@
 	},
 	"editor.insertSpaces": false,
 	"typescript.tsdk": "node_modules\\typescript\\lib",
-}
+}

package.json

@@ -1698,7 +1698,8 @@
             "tags": "json",
             "options": "json=omitempty",
             "promptForTags": false,
-            "transform": "snakecase"
+            "transform": "snakecase",
+            "template": ""
           },
           "description": "Tags and options configured here will be used by the Add Tags command to add tags to struct fields. If promptForTags is true, then user will be prompted for tags and options. By default, json tags are added.",
           "scope": "resource"

src/goModifytags.ts

@@ -8,7 +8,7 @@
 import cp = require('child_process');
 import vscode = require('vscode');
 import { toolExecutionEnvironment } from './goEnv';
-import { promptForMissingTool } from './goInstallTools';
+import { promptForMissingTool, promptForUpdatingTool } from './goInstallTools';
 import { byteOffsetAt, getBinPath, getFileArchive, getGoConfig } from './util';
 
 // Interface for the output from gomodifytags
@@ -24,6 +24,7 @@ interface GoTagsConfig {
 	tags: string;
 	options: string;
 	promptForTags: boolean;
+	template: string;
 }
 
 export function addTags(commandArgs: GoTagsConfig) {
@@ -32,7 +33,8 @@ export function addTags(commandArgs: GoTagsConfig) {
 		return;
 	}
 
-	getTagsAndOptions(<GoTagsConfig>getGoConfig()['addTags'], commandArgs).then(([tags, options, transformValue]) => {
+	getTagsAndOptions(<GoTagsConfig>getGoConfig()['addTags'], commandArgs).then((
+		[tags, options, transformValue, template]) => {
 		if (!tags && !options) {
 			return;
 		}
@@ -48,6 +50,10 @@ export function addTags(commandArgs: GoTagsConfig) {
 			args.push('--transform');
 			args.push(transformValue);
 		}
+		if (template) {
+			args.push('--template');
+			args.push(template);
+		}
 		runGomodifytags(args);
 	});
 }
@@ -112,9 +118,11 @@ function getTagsAndOptions(config: GoTagsConfig, commandArgs: GoTagsConfig): The
 			: config['promptForTags'];
 	const transformValue: string =
 		commandArgs && commandArgs.hasOwnProperty('transform') ? commandArgs['transform'] : config['transform'];
+	const format: string =
+		commandArgs && commandArgs.hasOwnProperty('template') ? commandArgs['template'] : config['template'];
 
 	if (!promptForTags) {
-		return Promise.resolve([tags, options, transformValue]);
+		return Promise.resolve([tags, options, transformValue, format]);
 	}
 
 	return vscode.window
@@ -135,7 +143,14 @@ function getTagsAndOptions(config: GoTagsConfig, commandArgs: GoTagsConfig): The
 							prompt: 'Enter transform value'
 						})
 						.then((transformOption) => {
-							return [inputTags, inputOptions, transformOption];
+							return vscode.window
+							.showInputBox({
+								value: format,
+								prompt: 'Enter template value'
+							})
+							.then((template) => {
+								return [inputTags, inputOptions, transformOption, template];
+							});
 						});
 				});
 		});
@@ -150,6 +165,12 @@ function runGomodifytags(args: string[]) {
 			promptForMissingTool('gomodifytags');
 			return;
 		}
+		if (err && (<any>err).code === 2 && args.indexOf('--template') > 0) {
+			vscode.window.showInformationMessage(`Cannot modify tags: you might be using a` +
+												`version that does not support --template`);
+			promptForUpdatingTool('gomodifytags');
+			return;
+		}
 		if (err) {
 			vscode.window.showInformationMessage(`Cannot modify tags: ${stderr}`);
 			return;