Organize into files based on related structs

.gitignore

@@ -1,5 +1,6 @@
+coverage.out
+dist
 groupby
-vendor
 target
-dist
-tmp
+tmp
+vendor

directory_visitor.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+)
+
+type DirectoryVisitor struct {
+	NodeVisitor
+	rootDir          string
+	flatten          bool
+	maxDepth         int
+	currentLevel     int
+	currentLevelDir  string
+	previousLevel    int
+	previousLevelDir string
+	indentLevel      int
+	pathParts        []string
+}
+
+func NewDirectoryVisitor(root string, flatten bool, maxDepth int) *DirectoryVisitor {
+	return &DirectoryVisitor{
+		rootDir:   root,
+		flatten:   flatten,
+		pathParts: []string{root, "", "", ""},
+		maxDepth:  maxDepth,
+	}
+}
+
+func (v *DirectoryVisitor) Visit(n *Node, depth int) {
+	v.currentLevel = depth
+	v.currentLevelDir = v.rootDir
+	if v.currentLevel == 0 {
+		v.indentLevel = 0
+		v.previousLevel = 0
+		v.pathParts[1] = ""
+		v.pathParts[2] = ""
+		v.pathParts[3] = ""
+		return
+	}
+
+	v.pathParts[depth-1] = FileNameByDepth(n.FileName, depth)
+
+	// We're probably at a month
+	if depth == 3 && !n.HasNext() {
+		v.pathParts[depth] = ""
+	}
+	dirs := []string{outputDirectory}
+	dirs = append(dirs, v.pathParts[:v.maxDepth]...)
+	if flatten && n.HasChildren() {
+		return
+	}
+	var dest string
+	source := path.Join(v.rootDir, n.FileName)
+	sfi, err := os.Stat(source)
+	if os.IsNotExist(err) {
+		// some internal nodes in our tree won't exist
+		return
+	}
+
+	destParts := []string{outputDirectory}
+	if copyOnly && sfi.IsDir() {
+		destParts = []string{}
+	}
+
+	if flatten {
+		dirs = []string{v.rootDir, strings.Join(v.pathParts[:v.maxDepth], "-")}
+		flattenedParent := strings.Join(v.pathParts[:v.maxDepth], "-")
+		destParts = append(destParts, flattenedParent)
+		destParts = append(destParts, n.FileName)
+	} else {
+		destParts = append(destParts, v.pathParts...)
+	}
+	dest = path.Join(destParts...)
+	// Create the destination directories
+	perm := os.FileMode(0755)
+	rootStat, _ := os.Stat(directory)
+	// use permissions of the root directory
+	perm = rootStat.Mode()
+	err = os.MkdirAll(path.Join(dirs...), perm)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to create directory %s \n", dirs)
+		os.Exit(1)
+		return
+	}
+
+	if copyOnly && sfi.IsDir() {
+		odabs, _ := filepath.Abs(outputDirectory)
+		dest = path.Join(odabs, dest)
+		source, _ = filepath.Abs(source)
+		// fmt.Fprintf(os.Stderr, "Creating sylink for directory ln -s %s %s \n", source, dest)
+		err = os.Symlink(source, dest)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to create symlink from=%s to =%s", source, dest)
+			os.Exit(1)
+			return
+		}
+		return
+	}
+
+	// Move the file from the source to the directory
+	err = moveOrCopyFile(source, dest)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error while moving/copying file to %s", dest)
+		return
+	}
+	v.previousLevel = depth
+}