feat: Add support for trim input prefix and set the prefix to the ass…

…et name.

Detail:
the tree (~/go/src/github.com/user/project):

    ./
    ./assets/
        templates/admin/template.tmpl
        static/js/vendors/jquery.min.js
    ./.xbinputs.yml

contents of ./.xbinputs.yml:
sources:
    - path: assets
      prefix: _
      recursive: true
      ns: "(2)/$PKG/.."

The new translate process "[C=(2)]/[B=$PKG]/[A=..]":
1. the Variables:
    - BASE_DIR: `assets`
    - BASE_DIR ABS PATH: `~/go/src/github.com/user/project/assets`
    - ASSETS_PACKAGE (inside `$GOPATH/src`): `github.com/user/project/assets`
2. translate the namespace:
    1. initial value: `(2)/$PKG/..`
    2. replaces `$PKG` to ASSETS_PACKAGE: `(2)/github.com/user/project/assets/..`
    3. clean it: `(2)/github.com/user/project`
    4. detect namespace DIR_REPLACES_COUNT: `(2)` -> set DIR_REPLACES_COUNT to `2`
3. walk assets:
    1. `templates/admin/template.tmpl`:
        1. detect DIR_REPLACES_COUNT (as `2`) values (from root path): two values:
            - first value `templates`
            - second value `admin`
            - result: `templates/admin`
        2. remove DIR_REPLACES_COUNT match in template path:
            - current template path is `templates/admin/template.tmpl`
            - now template path is: `template.tmpl`
        3. replaces DIR_REPLACES_COUNT match in namespace:
            - current namespace is `(2)/github.com/user/project`
            - replaces `(2)` to `templates/admin`
            - result: `templates/admin/github.com/user/project`
        3. make ASSET_NAME: join namespace and template path:
            - namespace is `templates/admin/github.com/user/project`
            - template path is `template.tmpl`
            - ASSET_NAME is `templates/admin/github.com/user/project/template.tmpl`
    2. `static/js/vendors/jquery.min.js`:
        1. detect DIR_REPLACES_COUNT (as `2`) values (from root path): two values:
            - first value `static`
            - second value `js`
            - result: `static/js`
        2. remove DIR_REPLACES_COUNT match in template path:
            - current template path is `static/js/vendors/jquery.min.js`
            - now template path is: `vendors/jquery.min.js`
        3. replaces DIR_REPLACES_COUNT match in namespace:
            - current namespace is `(2)/github.com/user/project`
            - replaces `(2)` to `static/js`
            - result: `static/js/github.com/user/project`
        3. make ASSET_NAME: join namespace and template path:
            - namespace is `static/js/github.com/user/project`
            - template path is `vendors/jquery.min.js`
            - ASSET_NAME is `static/js/github.com/user/project/jquery.min.js`
4. the assets names:
    - `templates/admin/template.tmpl` -> `templates/admin/github.com/user/project/template.tmpl`
    - `static/js/vendors/jquery.min.js` -> `static/js/github.com/user/project/jquery.min.js`

config.go

@@ -47,6 +47,8 @@ type InputConfig struct {
 
 	NameSpace string
 
+	DirReplacesCount int
+
 	WalkFunc func(visited *map[string]bool, recursive bool, cb func(info walker.FileInfo) error) error
 }
 

config_many.go

@@ -9,7 +9,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/go-errors/errors"
+	"github.com/pkg/errors"
 
 	"github.com/apex/log"
 
@@ -48,13 +48,14 @@ func (s ManyConfigInputSlice) Items(ctx context.Context) (r []InputConfig, err e
 }
 
 type ManyConfigInput struct {
-	Path       string
-	Prefix     string
-	NameSpace  string `mapstructure:"ns" yaml:"ns"`
-	Recursive  bool
-	Ignore     IgnoreSlice
-	IgnoreGlob IgnoreGlobSlice `mapstructure:"ignore_glob" yaml:"ignore_glob"`
-	Pkg        string
+	Path             string
+	Prefix           string
+	NameSpace        string `mapstructure:"ns" yaml:"ns"`
+	Recursive        bool
+	Ignore           IgnoreSlice
+	DirReplacesCount int
+	IgnoreGlob       IgnoreGlobSlice `mapstructure:"ignore_glob" yaml:"ignore_glob"`
+	Pkg              string
 }
 
 func (i *ManyConfigInput) UnmarshalMap(value interface{}) (err error) {
@@ -119,13 +120,24 @@ func (i ManyConfigInput) Config(ctx context.Context) (configs []*InputConfig, er
 		if i.NameSpace == "_" {
 			i.NameSpace = i.Pkg
 		} else if strings.Contains(i.NameSpace, "$PKG") {
-			i.NameSpace = strings.Replace(i.NameSpace, "$PKG", i.Pkg, 1)
+			i.NameSpace = strings.ReplaceAll(i.NameSpace, "$PKG", i.Pkg)
 		}
 
 		if i.NameSpace, err = i.format(ctx, "name_space", i.NameSpace); err != nil {
 			return
 		}
 
+		if startPos := strings.IndexByte(i.NameSpace, '('); startPos != -1 {
+			if endPos := strings.IndexByte(i.NameSpace[startPos:], ')'); endPos > 0 {
+				endPos += startPos
+				if i.DirReplacesCount, err = strconv.Atoi(i.NameSpace[1:endPos]); err != nil {
+					err = errors.Wrapf(err, "parse prefix trimer count")
+					return
+				}
+				i.NameSpace = i.NameSpace[0:startPos] + "?" + i.NameSpace[endPos+1:]
+			}
+		}
+
 		i.NameSpace = path.Clean(i.NameSpace)
 	}
 
@@ -199,10 +211,11 @@ func (i ManyConfigInput) Config(ctx context.Context) (configs []*InputConfig, er
 	}
 
 	c := &InputConfig{
-		Path:      i.Path,
-		Recursive: i.Recursive,
-		Prefix:    i.Prefix,
-		NameSpace: i.NameSpace,
+		Path:             i.Path,
+		Recursive:        i.Recursive,
+		Prefix:           i.Prefix,
+		NameSpace:        i.NameSpace,
+		DirReplacesCount: i.DirReplacesCount,
 	}
 
 	if i.Prefix == "_" {

convert_finder.go

@@ -67,7 +67,17 @@ func (this Finder) find(input *InputConfig, prefix string) (err error) {
 		}
 
 		if len(info.NamePrefix) > 0 {
+			var namePrefix []string
+			for i := 0; i < input.DirReplacesCount; i++ {
+				if pos := strings.IndexByte(asset.Name, '/'); pos > 0 {
+					namePrefix = append(namePrefix, asset.Name[0:pos])
+					asset.Name = strings.TrimPrefix(asset.Name[pos+1:], "/")
+				}
+			}
 			asset.Name = path.Join(append(info.NamePrefix, asset.Name)...)
+			if len(namePrefix) > 0 {
+				asset.Name = strings.ReplaceAll(asset.Name, "?", path.Join(namePrefix...))
+			}
 		}
 
 		// This shouldn't happen.