More expansions in template repositories (#10021)

* Super expansion
* Explain which features are in 1.11 vs 1.12
* Move imports

Signed-off-by: jolheiser <[email protected]>

Author: jolheiser

docs/content/doc/features/gitea-directory.md renamed to docs/content/doc/usage/template-repositories.md

@@ -1,23 +1,20 @@
 ---
 date: "2019-11-28:00:00+02:00"
-title: "The .gitea Directory"
-slug: "gitea-directory"
-weight: 40
+title: "Template Repositories"
+slug: "template-repositories"
+weight: 14
 toc: true
 draft: false
 menu:
   sidebar:
-    parent: "features"
-    name: "The .gitea Directory"
-    weight: 50
-    identifier: "gitea-directory"
+    parent: "usage"
+    name: "Template Repositories"
+    weight: 14
+    identifier: "template-repositories"
 ---
 
-# The .gitea directory
-Gitea repositories can include a `.gitea` directory at their base which will store settings/configurations for certain features.
-
-## Templates
-Gitea includes template repositories, and one feature implemented with them is auto-expansion of specific variables within your template files.  
+## Template Repositories
+Gitea `1.11.0` and above includes template repositories, and one feature implemented with them is auto-expansion of specific variables within your template files.  
 To tell Gitea which files to expand, you must include a `template` file inside the `.gitea` directory of the template repository.  
 Gitea uses [gobwas/glob](https://github.com/gobwas/glob) for its glob syntax. It closely resembles a traditional `.gitignore`, however there may be slight differences.
 
@@ -42,15 +39,34 @@ a/b/c/d.json
 In any file matched by the above globs, certain variables will be expanded.  
 All variables must be of the form `$VAR` or `${VAR}`. To escape an expansion, use a double `$$`, such as `$$VAR` or `$${VAR}`
 
-| Variable             | Expands To                                          |
-|----------------------|-----------------------------------------------------|
-| REPO_NAME            | The name of the generated repository                |
-| TEMPLATE_NAME        | The name of the template repository                 |
-| REPO_DESCRIPTION     | The description of the generated repository         |
-| TEMPLATE_DESCRIPTION | The description of the template repository          |
-| REPO_LINK            | The URL to the generated repository                 |
-| TEMPLATE_LINK        | The URL to the template repository                  |
-| REPO_HTTPS_URL       | The HTTP(S) clone link for the generated repository |
-| TEMPLATE_HTTPS_URL   | The HTTP(S) clone link for the template repository  |
-| REPO_SSH_URL         | The SSH clone link for the generated repository     |
-| TEMPLATE_SSH_URL     | The SSH clone link for the template repository      |
+| Variable             | Expands To                                          | Transformable |
+|----------------------|-----------------------------------------------------|---------------|
+| REPO_NAME            | The name of the generated repository                | ✓             |
+| TEMPLATE_NAME        | The name of the template repository                 | ✓             |
+| REPO_DESCRIPTION     | The description of the generated repository         | ✘             |
+| TEMPLATE_DESCRIPTION | The description of the template repository          | ✘             |
+| REPO_OWNER           | The owner of the generated repository               | ✓             |
+| TEMPLATE_OWNER       | The owner of the template repository                | ✓             |
+| REPO_LINK            | The URL to the generated repository                 | ✘             |
+| TEMPLATE_LINK        | The URL to the template repository                  | ✘             |
+| REPO_HTTPS_URL       | The HTTP(S) clone link for the generated repository | ✘             |
+| TEMPLATE_HTTPS_URL   | The HTTP(S) clone link for the template repository  | ✘             |
+| REPO_SSH_URL         | The SSH clone link for the generated repository     | ✘             |
+| TEMPLATE_SSH_URL     | The SSH clone link for the template repository      | ✘             |
+
+### Transformers :robot:
+Gitea `1.12.0` adds a few transformers to some of the applicable variables above.  
+For example, to get `REPO_NAME` in `PASCAL`-case, your template would use `${REPO_NAME_PASCAL}`
+
+Feeding `go-sdk` to the available transformers yields...
+
+| Transformer | Effect     |
+|-------------|------------|
+| SNAKE       | go_sdk     |
+| KEBAB       | go-sdk     |
+| CAMEL       | goSdk      |
+| PASCAL      | GoSdk      |
+| LOWER       | go-sdk     |
+| UPPER       | GO-SDK     |
+| TITLE       | Go-Sdk     |
+

go.mod

@@ -50,6 +50,7 @@ require (
 	github.com/gogs/cron v0.0.0-20171120032916-9f6c956d3e14
 	github.com/google/go-github/v24 v24.0.1
 	github.com/gorilla/context v1.1.1
+	github.com/huandu/xstrings v1.3.0
 	github.com/issue9/assert v1.3.2 // indirect
 	github.com/issue9/identicon v0.0.0-20160320065130-d36b54562f4c
 	github.com/jaytaylor/html2text v0.0.0-20160923191438-8fb95d837f7d

go.sum

@@ -306,6 +306,8 @@ github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/huandu/xstrings v1.3.0 h1:gvV6jG9dTgFEncxo+AF7PH6MZXi/vZl25owA/8Dg8Wo=
+github.com/huandu/xstrings v1.3.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/issue9/assert v1.3.2 h1:IaTa37u4m1fUuTH9K9ldO5IONKVDXjLiUO1T9vj0OF0=
 github.com/issue9/assert v1.3.2/go.mod h1:9Ger+iz8X7r1zMYYwEhh++2wMGWcNN2oVI+zIQXxcio=

modules/repository/generate.go

@@ -16,38 +16,62 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
+
+	"github.com/huandu/xstrings"
 )
 
+type transformer struct {
+	Name      string
+	Transform func(string) string
+}
+
+type expansion struct {
+	Name         string
+	Value        string
+	Transformers []transformer
+}
+
+var defaultTransformers = []transformer{
+	{Name: "SNAKE", Transform: xstrings.ToSnakeCase},
+	{Name: "KEBAB", Transform: xstrings.ToKebabCase},
+	{Name: "CAMEL", Transform: func(str string) string {
+		return xstrings.FirstRuneToLower(xstrings.ToCamelCase(str))
+	}},
+	{Name: "PASCAL", Transform: xstrings.ToCamelCase},
+	{Name: "LOWER", Transform: strings.ToLower},
+	{Name: "UPPER", Transform: strings.ToUpper},
+	{Name: "TITLE", Transform: strings.Title},
+}
+
 func generateExpansion(src string, templateRepo, generateRepo *models.Repository) string {
+	expansions := []expansion{
+		{Name: "REPO_NAME", Value: generateRepo.Name, Transformers: defaultTransformers},
+		{Name: "TEMPLATE_NAME", Value: templateRepo.Name, Transformers: defaultTransformers},
+		{Name: "REPO_DESCRIPTION", Value: generateRepo.Description, Transformers: nil},
+		{Name: "TEMPLATE_DESCRIPTION", Value: templateRepo.Description, Transformers: nil},
+		{Name: "REPO_OWNER", Value: generateRepo.OwnerName, Transformers: defaultTransformers},
+		{Name: "TEMPLATE_OWNER", Value: templateRepo.OwnerName, Transformers: defaultTransformers},
+		{Name: "REPO_LINK", Value: generateRepo.Link(), Transformers: nil},
+		{Name: "TEMPLATE_LINK", Value: templateRepo.Link(), Transformers: nil},
+		{Name: "REPO_HTTPS_URL", Value: generateRepo.CloneLink().HTTPS, Transformers: nil},
+		{Name: "TEMPLATE_HTTPS_URL", Value: templateRepo.CloneLink().HTTPS, Transformers: nil},
+		{Name: "REPO_SSH_URL", Value: generateRepo.CloneLink().SSH, Transformers: nil},
+		{Name: "TEMPLATE_SSH_URL", Value: templateRepo.CloneLink().SSH, Transformers: nil},
+	}
+
+	var expansionMap = make(map[string]string)
+	for _, e := range expansions {
+		expansionMap[e.Name] = e.Value
+		for _, tr := range e.Transformers {
+			expansionMap[fmt.Sprintf("%s_%s", e.Name, tr.Name)] = tr.Transform(e.Value)
+		}
+	}
+
 	return os.Expand(src, func(key string) string {
-		switch key {
-		case "REPO_NAME":
-			return generateRepo.Name
-		case "TEMPLATE_NAME":
-			return templateRepo.Name
-		case "REPO_DESCRIPTION":
-			return generateRepo.Description
-		case "TEMPLATE_DESCRIPTION":
-			return templateRepo.Description
-		case "REPO_OWNER":
-			return generateRepo.OwnerName
-		case "TEMPLATE_OWNER":
-			return templateRepo.OwnerName
-		case "REPO_LINK":
-			return generateRepo.Link()
-		case "TEMPLATE_LINK":
-			return templateRepo.Link()
-		case "REPO_HTTPS_URL":
-			return generateRepo.CloneLink().HTTPS
-		case "TEMPLATE_HTTPS_URL":
-			return templateRepo.CloneLink().HTTPS
-		case "REPO_SSH_URL":
-			return generateRepo.CloneLink().SSH
-		case "TEMPLATE_SSH_URL":
-			return templateRepo.CloneLink().SSH
-		default:
-			return key
+		if expansion, ok := expansionMap[key]; ok {
+			return expansion
 		}
+		return key
 	})
 }
 
@@ -104,41 +128,43 @@ func generateRepoCommit(repo, templateRepo, generateRepo *models.Repository, tmp
 		return fmt.Errorf("checkGiteaTemplate: %v", err)
 	}
 
-	if err := os.Remove(gt.Path); err != nil {
-		return fmt.Errorf("remove .giteatemplate: %v", err)
-	}
-
-	// Avoid walking tree if there are no globs
-	if len(gt.Globs()) > 0 {
-		tmpDirSlash := strings.TrimSuffix(filepath.ToSlash(tmpDir), "/") + "/"
-		if err := filepath.Walk(tmpDirSlash, func(path string, info os.FileInfo, walkErr error) error {
-			if walkErr != nil {
-				return walkErr
-			}
+	if gt != nil {
+		if err := os.Remove(gt.Path); err != nil {
+			return fmt.Errorf("remove .giteatemplate: %v", err)
+		}
 
-			if info.IsDir() {
-				return nil
-			}
+		// Avoid walking tree if there are no globs
+		if len(gt.Globs()) > 0 {
+			tmpDirSlash := strings.TrimSuffix(filepath.ToSlash(tmpDir), "/") + "/"
+			if err := filepath.Walk(tmpDirSlash, func(path string, info os.FileInfo, walkErr error) error {
+				if walkErr != nil {
+					return walkErr
+				}
 
-			base := strings.TrimPrefix(filepath.ToSlash(path), tmpDirSlash)
-			for _, g := range gt.Globs() {
-				if g.Match(base) {
-					content, err := ioutil.ReadFile(path)
-					if err != nil {
-						return err
-					}
+				if info.IsDir() {
+					return nil
+				}
 
-					if err := ioutil.WriteFile(path,
-						[]byte(generateExpansion(string(content), templateRepo, generateRepo)),
-						0644); err != nil {
-						return err
+				base := strings.TrimPrefix(filepath.ToSlash(path), tmpDirSlash)
+				for _, g := range gt.Globs() {
+					if g.Match(base) {
+						content, err := ioutil.ReadFile(path)
+						if err != nil {
+							return err
+						}
+
+						if err := ioutil.WriteFile(path,
+							[]byte(generateExpansion(string(content), templateRepo, generateRepo)),
+							0644); err != nil {
+							return err
+						}
+						break
 					}
-					break
 				}
+				return nil
+			}); err != nil {
+				return err
 			}
-			return nil
-		}); err != nil {
-			return err
 		}
 	}