Remote templates support

_docs/README.md

@@ -34,11 +34,11 @@ Template](https://golang.org/pkg/text/template) syntax:
 
 Copy an image into the `website-boilerplate` folder and call it `logo.png`.
 
-Finally, run `boilerplate`, setting the `--template-folder` to `website-boilerplate` and `--output-folder` to the path
+Finally, run `boilerplate`, setting the `--template-url` to `website-boilerplate` and `--output-folder` to the path
 where you want the generated code to go:
 
 ```
-boilerplate --template-folder /home/ubuntu/website-boilerplate --output-folder /home/ubuntu/website-output
+boilerplate --template-url /home/ubuntu/website-boilerplate --output-folder /home/ubuntu/website-output
 
 Title
 
@@ -58,7 +58,7 @@ Generating /home/ubuntu/website-output/index.html
 Copying /home/ubuntu/website-output/logo.png
 ```
 
-Boilerplate copies any files from the `--template-folder` into the `--output-folder`, passing them through the
+Boilerplate copies any files from the `--template-url` into the `--output-folder`, passing them through the
 [Go Template](https://golang.org/pkg/text/template) engine along the way. After running the command above, the
 `website-output` folder will contain a `logo.png` (unchanged from the original) and an `index.html` with the
 following contents:
@@ -71,7 +71,7 @@ You can also run Boilerplate non-interactively, which is great for automation:
 
 ```
 boilerplate \
-  --template-folder /home/ubuntu/website-boilerplate \
+  --template-url /home/ubuntu/website-boilerplate \
   --output-folder /home/ubuntu/website-output \
   --non-interactive \
   --var Title="Boilerplate Example" \
@@ -112,11 +112,11 @@ You can find older versions on the [Releases Page](https://github.com/gruntwork-
 
 When you run Boilerplate, it performs the following steps:
 
-1. Read the `boilerplate.yml` file in the folder specified by the `--template-folder` option to find all defined
+1. Read the `boilerplate.yml` file in the folder specified by the `--template-url` option to find all defined
    varaibles.
 1. Gather values for the variables from any `--var` and `--var-file` options that were passed in and prompting the user
    for the rest (unless the `--non-interactive` flag is specified).
-1. Copy each file from `--template-folder` to `--output-folder`, running each non-binary file through the Go
+1. Copy each file from `--template-url` to `--output-folder`, running each non-binary file through the Go
    Template engine with the map of variables as the data structure.
 
 Learn more about boilerplate in the following sections:
@@ -133,7 +133,9 @@ Learn more about boilerplate in the following sections:
 
 The `boilerplate` binary supports the following options:
 
-* `--template-folder FOLDER` (required): Generate the project from the templates in `FOLDER`.
+* `--template-url URL` (required): Generate the project from the templates in `URL`. This can be a local path, or a
+  [go-getter](https://github.com/hashicorp/go-getter) compatible URL for remote templates (e.g.,
+  `[email protected]:gruntwork-io/boilerplate.git//examples/include?ref=master`).
 * `--output-folder` (required): Create the output files and folders in `FOLDER`.
 * `--non-interactive` (optional): Do not prompt for input variables. All variables must be set via `--var` and
   `--var-file` options instead.
@@ -155,21 +157,28 @@ Some examples:
 Generate a project in ~/output from the templates in ~/templates:
 
 ```
-boilerplate --template-folder ~/templates --output-folder ~/output
+boilerplate --template-url ~/templates --output-folder ~/output
 ```
 
 Generate a project in ~/output from the templates in ~/templates, using variables passed in via the command line:
 
 ```
-boilerplate --template-folder ~/templates --output-folder ~/output --var "Title=Boilerplate" --var "ShowLogo=false"
+boilerplate --template-url ~/templates --output-folder ~/output --var "Title=Boilerplate" --var "ShowLogo=false"
 ```
 
 Generate a project in ~/output from the templates in ~/templates, using variables read from a file:
 
 ```
-boilerplate --template-folder ~/templates --output-folder ~/output --var-file vars.yml
+boilerplate --template-url ~/templates --output-folder ~/output --var-file vars.yml
 ```
 
+Generate a project in ~/output from the templates in this repo's `include` example dir, using variables read from a file:
+
+```
+boilerplate --template-url "[email protected]:gruntwork-io/boilerplate.git//examples/include?ref=master" --output-folder ~/output --var-file vars.yml
+```
+
+
 #### The boilerplate.yml file
 
 The `boilerplate.yml` file is used to configure `boilerplate`. The file is optional. If you don't specify it, you can
@@ -191,7 +200,7 @@ variables:
 
 dependencies:
   - name: <DEPENDENCY_NAME>
-    template-folder: <FOLDER>
+    template-url: <FOLDER>
     output-folder: <FOLDER>
     skip: <CONDITION>
     dont-inherit-variables: <BOOLEAN>
@@ -244,7 +253,7 @@ See the [Variables](#variables) section for more info.
 executing the current one. Each dependency may contain the following keys:
 
 * `name` (Required): A unique name for the dependency.
-* `template-folder` (Required): Run `boilerplate` on the templates in this folder. This path is relative to the
+* `template-url` (Required): Run `boilerplate` on the templates in this folder. This path is relative to the
   current template.
 * `output-folder` (Required): Create the output files and folders in this folder. This path is relative to the output
   folder of the current template.
@@ -350,7 +359,7 @@ Note the following:
   prompt you for each of those variables separately from the root ones. You can also use the
   `<DEPENDENCY_NAME>.<VARIABLE_NAME>` syntax as the name of the variable with the `-var` flag and inside of a var file
   to provide a value for a variable in a dependency.
-* Interpolation: You may use interpolation in the `template-folder` and `output-folder` parameters of your 
+* Interpolation: You may use interpolation in the `template-url` and `output-folder` parameters of your 
   dependencies. This allows you to use specify the paths to your template and output folders dynamically.
 * Conditional dependencies: You can enable or disable a dependency using the `skip` parameter, which supports Go
   templating syntax and boilerplate variables. If the `skip` parameter evaluates to the string `true`, the 
@@ -366,7 +375,7 @@ Note the following:
 
     dependencies:
       - name: conditional-dependency-example
-        template-folder: ../foo
+        template-url: ../foo
         output-folder: foo
         # Skip this dependency if both .Foo and .Bar are set to true
         skip: "{{"{{"}} and .Foo .Bar {{"}}"}}"
@@ -402,7 +411,7 @@ Note the following:
           - {{"{{"}} .SomeVariable {{"}}"}} 
           - {{"{{"}} .AnotherVariable {{"}}"}}
     ```
-* Boilerplate runs your `command` with the working directory set to the `--template-folder` option.
+* Boilerplate runs your `command` with the working directory set to the `--template-url` option.
 * `skip` (Optional): Skip this hook if this condition, which can use Go templating syntax and 
   boilerplate variables, evaluates to the string `true`. This is useful to conditionally enable or disable 
   dependencies.
@@ -411,7 +420,7 @@ Note the following:
 #### Templates
 
 Boilerplate puts all the variables into a Go map where the key is the name of the variable and the value is what
-the user provided. It then starts copying files from the `--template-folder` into the `--output-folder`, passing each
+the user provided. It then starts copying files from the `--template-url` into the `--output-folder`, passing each
 non-binary file through the [Go Template](https://golang.org/pkg/text/template) engine, with the variable map as a
 data structure.
 
@@ -481,7 +490,8 @@ Boilerplate also includes several custom helpers that you can access that enhanc
   so you can use paths relative to the file from which you are calling the `shell` helper. Any argument you pass of the
   form `ENV:KEY=VALUE` will be set as an environment variable for the command rather than an argument. For another way 
   to execute commands, see [hooks](#hooks).
-* `templateFolder`: Return the value of the `--template-folder` command-line option. Useful for building relative paths.
+* `templateFolder`: Return the value of the template working dir. This is the value of the `--template-url` command-line
+  option if local template, or the download dir if remote template. Useful for building relative paths.
 * `outputFolder`: Return the value of the `--output-folder` command-line option. Useful for building relative paths.
 * `envWithDefault NAME DEFAULT`: Render the value of environment variable `NAME`. If that environment variable is empty or not 
   defined, render `DEFAULT` instead.

_docs/boilerplate.yml

@@ -1,2 +1,2 @@
 variables:
-  - name: Version
+  - name: Version

cli/boilerplate_cli.go

@@ -17,15 +17,19 @@ A tool for generating files and folders (\"boilerplate\") from a set of template
 
 Generate a project in ~/output from the templates in ~/templates:
 
-    boilerplate --template-folder ~/templates --output-folder ~/output
+    boilerplate --template-url ~/templates --output-folder ~/output
 
 Generate a project in ~/output from the templates in ~/templates, using variables passed in via the command line:
 
-    boilerplate --template-folder ~/templates --output-folder ~/output --var "Title=Boilerplate" --var "ShowLogo=false"
+    boilerplate --template-url ~/templates --output-folder ~/output --var "Title=Boilerplate" --var "ShowLogo=false"
 
 Generate a project in ~/output from the templates in ~/templates, using variables read from a file:
 
-    boilerplate --template-folder ~/templates --output-folder ~/output --var-file vars.yml
+    boilerplate --template-url ~/templates --output-folder ~/output --var-file vars.yml
+
+Generate a project in ~/output from the templates in this repo's include example dir, using variables read from a file:
+
+	boilerplate --template-url "[email protected]:gruntwork-io/boilerplate.git//examples/include?ref=master" --output-folder ~/output --var-file vars.yml
 
 
 Options:
@@ -47,8 +51,8 @@ func CreateBoilerplateCli(version string) *cli.App {
 
 	app.Flags = []cli.Flag{
 		cli.StringFlag{
-			Name:  options.OptTemplateFolder,
-			Usage: "Generate the project from the templates in `FOLDER`.",
+			Name:  options.OptTemplateUrl,
+			Usage: "Generate the project from the templates in `URL`. This can be a local path, or a go-getter compatible URL for remote templates (e.g., `[email protected]:gruntwork-io/boilerplate.git//examples/include?ref=master`).",
 		},
 		cli.StringFlag{
 			Name:  options.OptOutputFolder,
@@ -91,8 +95,7 @@ func CreateBoilerplateCli(version string) *cli.App {
 // When you run the CLI, this is the action function that gets called
 func runApp(cliContext *cli.Context) error {
 	if !cliContext.Args().Present() && cliContext.NumFlags() == 0 {
-		cli.ShowAppHelp(cliContext)
-		return nil
+		return cli.ShowAppHelp(cliContext)
 	}
 
 	opts, err := options.ParseOptions(cliContext)

config/config_test.go

@@ -300,7 +300,7 @@ func TestParseBoilerplateConfigAllTypes(t *testing.T) {
 // YAML is whitespace sensitive, so we need to be careful that we don't introduce unnecessary indentation
 const CONFIG_ONE_DEPENDENCY = `dependencies:
   - name: dep1
-    template-folder: /template/folder1
+    template-url: /template/folder1
     output-folder: /output/folder1
 `
 
@@ -311,7 +311,7 @@ func TestParseBoilerplateConfigOneDependency(t *testing.T) {
 	expected := &BoilerplateConfig{
 		Variables: []variables.Variable{},
 		Dependencies: []variables.Dependency{
-			{Name: "dep1", TemplateFolder: "/template/folder1", OutputFolder: "/output/folder1", DontInheritVariables: false, Variables: []variables.Variable{}},
+			{Name: "dep1", TemplateUrl: "/template/folder1", OutputFolder: "/output/folder1", DontInheritVariables: false, Variables: []variables.Variable{}},
 		},
 		Hooks: variables.Hooks{},
 	}
@@ -323,11 +323,11 @@ func TestParseBoilerplateConfigOneDependency(t *testing.T) {
 // YAML is whitespace sensitive, so we need to be careful that we don't introduce unnecessary indentation
 const CONFIG_MULTIPLE_DEPENDENCIES = `dependencies:
   - name: dep1
-    template-folder: /template/folder1
+    template-url: /template/folder1
     output-folder: /output/folder1
 
   - name: dep2
-    template-folder: /template/folder2
+    template-url: /template/folder2
     output-folder: /output/folder2
     dont-inherit-variables: true
     variables:
@@ -336,7 +336,7 @@ const CONFIG_MULTIPLE_DEPENDENCIES = `dependencies:
         default: foo
 
   - name: dep3
-    template-folder: /template/folder3
+    template-url: /template/folder3
     output-folder: /output/folder3
     skip: "{{ and .Foo .Bar }}"
 `
@@ -350,14 +350,14 @@ func TestParseBoilerplateConfigMultipleDependencies(t *testing.T) {
 		Dependencies: []variables.Dependency{
 			{
 				Name:                 "dep1",
-				TemplateFolder:       "/template/folder1",
+				TemplateUrl:          "/template/folder1",
 				OutputFolder:         "/output/folder1",
 				DontInheritVariables: false,
 				Variables:            []variables.Variable{},
 			},
 			{
 				Name:                 "dep2",
-				TemplateFolder:       "/template/folder2",
+				TemplateUrl:          "/template/folder2",
 				OutputFolder:         "/output/folder2",
 				DontInheritVariables: true,
 				Variables: []variables.Variable{
@@ -366,7 +366,7 @@ func TestParseBoilerplateConfigMultipleDependencies(t *testing.T) {
 			},
 			{
 				Name:                 "dep3",
-				TemplateFolder:       "/template/folder3",
+				TemplateUrl:          "/template/folder3",
 				OutputFolder:         "/output/folder3",
 				DontInheritVariables: false,
 				Variables:            []variables.Variable{},
@@ -382,7 +382,7 @@ func TestParseBoilerplateConfigMultipleDependencies(t *testing.T) {
 
 // YAML is whitespace sensitive, so we need to be careful that we don't introduce unnecessary indentation
 const CONFIG_DEPENDENCY_MISSING_NAME = `dependencies:
-  - template-folder: /template/folder1
+  - template-url: /template/folder1
     output-folder: /output/folder1
 `
 
@@ -401,19 +401,19 @@ const CONFIG_DEPENDENCY_MISSING_TEMPLATE_FOLDER = `dependencies:
     output-folder: /output/folder1
 `
 
-func TestParseBoilerplateConfigDependencyMissingTemplateFolder(t *testing.T) {
+func TestParseBoilerplateConfigDependencyMissingTemplateUrl(t *testing.T) {
 	t.Parallel()
 
 	_, err := ParseBoilerplateConfig([]byte(CONFIG_DEPENDENCY_MISSING_TEMPLATE_FOLDER))
 
 	assert.NotNil(t, err)
-	assert.True(t, errors.IsError(err, variables.RequiredFieldMissing("template-folder")), "Expected a RequiredFieldMissing error but got %s", reflect.TypeOf(errors.Unwrap(err)))
+	assert.True(t, errors.IsError(err, variables.RequiredFieldMissing("template-url")), "Expected a RequiredFieldMissing error but got %s", reflect.TypeOf(errors.Unwrap(err)))
 }
 
 // YAML is whitespace sensitive, so we need to be careful that we don't introduce unnecessary indentation
 const CONFIG_DEPENDENCY_MISSING_VARIABLE_NAME = `dependencies:
   - name: dep1
-    template-folder: /template/folder1
+    template-url: /template/folder1
     output-folder: /output/folder1
     variables:
       - description: Enter foo
@@ -432,11 +432,11 @@ func TestParseBoilerplateConfigDependencyMissingVariableName(t *testing.T) {
 // YAML is whitespace sensitive, so we need to be careful that we don't introduce unnecessary indentation
 const CONFIG_DEPENDENCY_MISSING_OUTPUT_FOLDER = `dependencies:
   - name: dep1
-    template-folder: /template/folder1
+    template-url: /template/folder1
     output-folder: /output/folder1
 
   - name: dep2
-    template-folder: /template/folder2
+    template-url: /template/folder2
 `
 
 func TestParseBoilerplateConfigDependencyMissingOutputFolder(t *testing.T) {
@@ -451,15 +451,15 @@ func TestParseBoilerplateConfigDependencyMissingOutputFolder(t *testing.T) {
 // YAML is whitespace sensitive, so we need to be careful that we don't introduce unnecessary indentation
 const CONFIG_DEPENDENCY_DUPLICATE_NAMES = `dependencies:
   - name: dep1
-    template-folder: /template/folder1
+    template-url: /template/folder1
     output-folder: /output/folder1
 
   - name: dep2
-    template-folder: /template/folder2
+    template-url: /template/folder2
     output-folder: /output/folder2
 
   - name: dep1
-    template-folder: /template/folder3
+    template-url: /template/folder3
     output-folder: /output/folder3
 `
 
@@ -619,8 +619,8 @@ func TestLoadBoilerplateConfigFullConfig(t *testing.T) {
 			variables.NewStringVariable("baz").WithDescription("example description").WithDefault("default"),
 		},
 		Dependencies: []variables.Dependency{
-			{Name: "dep1", TemplateFolder: "/template/folder1", OutputFolder: "/output/folder1", DontInheritVariables: false, Variables: []variables.Variable{}},
-			{Name: "dep2", TemplateFolder: "/template/folder2", OutputFolder: "/output/folder2", DontInheritVariables: true, Variables: []variables.Variable{
+			{Name: "dep1", TemplateUrl: "/template/folder1", OutputFolder: "/output/folder1", DontInheritVariables: false, Variables: []variables.Variable{}},
+			{Name: "dep2", TemplateUrl: "/template/folder2", OutputFolder: "/output/folder2", DontInheritVariables: true, Variables: []variables.Variable{
 				variables.NewStringVariable("baz").WithDescription("example description").WithDefault("other-default"),
 				variables.NewStringVariable("abc").WithDescription("example description").WithDefault("default"),
 			}},

examples/dependencies-dynamic/README.md

@@ -2,6 +2,6 @@
 
 {{ .Description }}. It specifies both the
 [docs](/examples/docs) and [website](/examples/website) examples as dependencies to show how one boilerplate template
-can pull in another, and that you can use interpolation in the `template-folder` and `output-folder` parameters of 
-dependencies to dynamically specify where to read the template and where to write the output. It also defines all the 
-variables needed for both of those dependencies at the top level to show how variable inheritance works.
+can pull in another, and that you can use interpolation in the `template-url` and `output-folder` parameters of
+dependencies to dynamically specify where to read the template and where to write the output. It also defines all the
+variables needed for both of those dependencies at the top level to show how variable inheritance works.

examples/dependencies-dynamic/boilerplate.yml

@@ -17,7 +17,7 @@ variables:
     default: true
 
   - name: WebsiteTemplateFolder
-    description: The path to the website templates folder. This is used to check that interpolations work in the template-folder parameter of dependencies.
+    description: The path to the website templates folder. This is used to check that interpolations work in the template-url parameter of dependencies.
 
   - name: WebsiteOutputFolder
     description: The path to the website output folder. This is used to check that interpolations work in the output-folder parameter of dependencies.
@@ -39,26 +39,26 @@ variables:
 
 dependencies:
     - name: docs
-      template-folder: ../docs
+      template-url: ../docs
       output-folder: ./docs
       skip: "{{ .SkipAllDependencies }}"
       variables:
         - name: Title
           description: Enter the title of the docs page
 
     - name: website
-      template-folder: "{{ .WebsiteTemplateFolder }}"
+      template-url: "{{ .WebsiteTemplateFolder }}"
       output-folder: "{{ .WebsiteOutputFolder }}"
       skip: "{{ or .SkipAllDependencies .SkipFirstWebsiteDependency }}"
       variables:
         - name: Title
           description: Enter the title of the website
 
     - name: skip-website
-      template-folder: "{{ .WebsiteTemplateFolder }}"
+      template-url: "{{ .WebsiteTemplateFolder }}"
       output-folder: "{{ .WebsiteOutputFolder }}"
       skip: "{{ or .SkipAllDependencies .SkipSecondWebsiteDependency }}"
       variables:
         - name: Title
           description: Enter the title of the website
-          default: This website dependency should be skipped
+          default: This website dependency should be skipped