Refactor editor (#34780)

A complete rewrite

routers/web/repo/editor_util.go

@@ -0,0 +1,85 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repo
+
+import (
+	"context"
+	"fmt"
+	"path"
+	"strings"
+
+	git_model "code.gitea.io/gitea/models/git"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/log"
+	context_service "code.gitea.io/gitea/services/context"
+)
+
+// getUniquePatchBranchName Gets a unique branch name for a new patch branch
+// It will be in the form of <username>-patch-<num> where <num> is the first branch of this format
+// that doesn't already exist. If we exceed 1000 tries or an error is thrown, we just return "" so the user has to
+// type in the branch name themselves (will be an empty field)
+func getUniquePatchBranchName(ctx context.Context, prefixName string, repo *repo_model.Repository) string {
+	prefix := prefixName + "-patch-"
+	for i := 1; i <= 1000; i++ {
+		branchName := fmt.Sprintf("%s%d", prefix, i)
+		if exist, err := git_model.IsBranchExist(ctx, repo.ID, branchName); err != nil {
+			log.Error("getUniquePatchBranchName: %v", err)
+			return ""
+		} else if !exist {
+			return branchName
+		}
+	}
+	return ""
+}
+
+// getClosestParentWithFiles Recursively gets the closest path of parent in a tree that has files when a file in a tree is
+// deleted. It returns "" for the tree root if no parents other than the root have files.
+func getClosestParentWithFiles(gitRepo *git.Repository, branchName, originTreePath string) string {
+	var f func(treePath string, commit *git.Commit) string
+	f = func(treePath string, commit *git.Commit) string {
+		if treePath == "" || treePath == "." {
+			return ""
+		}
+		// see if the tree has entries
+		if tree, err := commit.SubTree(treePath); err != nil {
+			return f(path.Dir(treePath), commit) // failed to get the tree, going up a dir
+		} else if entries, err := tree.ListEntries(); err != nil || len(entries) == 0 {
+			return f(path.Dir(treePath), commit) // no files in this dir, going up a dir
+		}
+		return treePath
+	}
+	commit, err := gitRepo.GetBranchCommit(branchName) // must get the commit again to get the latest change
+	if err != nil {
+		log.Error("GetBranchCommit: %v", err)
+		return ""
+	}
+	return f(originTreePath, commit)
+}
+
+// getContextRepoEditorConfig returns the editorconfig JSON string for given treePath or "null"
+func getContextRepoEditorConfig(ctx *context_service.Context, treePath string) string {
+	ec, _, err := ctx.Repo.GetEditorconfig()
+	if err == nil {
+		def, err := ec.GetDefinitionForFilename(treePath)
+		if err == nil {
+			jsonStr, _ := json.Marshal(def)
+			return string(jsonStr)
+		}
+	}
+	return "null"
+}
+
+// getParentTreeFields returns list of parent tree names and corresponding tree paths based on given treePath.
+// eg: []{"a", "b", "c"}, []{"a", "a/b", "a/b/c"}
+// or: []{""}, []{""} for the root treePath
+func getParentTreeFields(treePath string) (treeNames, treePaths []string) {
+	treeNames = strings.Split(treePath, "/")
+	treePaths = make([]string, len(treeNames))
+	for i := range treeNames {
+		treePaths[i] = strings.Join(treeNames[:i+1], "/")
+	}
+	return treeNames, treePaths
+}