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path: root/routers/api/v1/repo/compare.go
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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package repo

import (
	"net/http"
	"strings"

	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/gitrepo"
	api "code.gitea.io/gitea/modules/structs"
	"code.gitea.io/gitea/services/context"
	"code.gitea.io/gitea/services/convert"
)

// CompareDiff compare two branches or commits
func CompareDiff(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/compare/{basehead} repository repoCompareDiff
	// ---
	// summary: Get commit comparison information
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: basehead
	//   in: path
	//   description: compare two branches or commits
	//   type: string
	//   required: true
	// responses:
	//   "200":
	//     "$ref": "#/responses/Compare"
	//   "404":
	//     "$ref": "#/responses/notFound"

	if ctx.Repo.GitRepo == nil {
		gitRepo, err := gitrepo.OpenRepository(ctx, ctx.Repo.Repository)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, "OpenRepository", err)
			return
		}
		ctx.Repo.GitRepo = gitRepo
		defer gitRepo.Close()
	}

	infoPath := ctx.Params("*")
	infos := []string{ctx.Repo.Repository.DefaultBranch, ctx.Repo.Repository.DefaultBranch}
	if infoPath != "" {
		infos = strings.SplitN(infoPath, "...", 2)
		if len(infos) != 2 {
			if infos = strings.SplitN(infoPath, "..", 2); len(infos) != 2 {
				infos = []string{ctx.Repo.Repository.DefaultBranch, infoPath}
			}
		}
	}

	_, headGitRepo, ci, _, _ := parseCompareInfo(ctx, api.CreatePullRequestOption{
		Base: infos[0],
		Head: infos[1],
	})
	if ctx.Written() {
		return
	}
	defer headGitRepo.Close()

	verification := ctx.FormString("verification") == "" || ctx.FormBool("verification")
	files := ctx.FormString("files") == "" || ctx.FormBool("files")

	apiCommits := make([]*api.Commit, 0, len(ci.Commits))
	userCache := make(map[string]*user_model.User)
	for i := 0; i < len(ci.Commits); i++ {
		apiCommit, err := convert.ToCommit(ctx, ctx.Repo.Repository, ctx.Repo.GitRepo, ci.Commits[i], userCache,
			convert.ToCommitOptions{
				Stat:         true,
				Verification: verification,
				Files:        files,
			})
		if err != nil {
			ctx.ServerError("toCommit", err)
			return
		}
		apiCommits = append(apiCommits, apiCommit)
	}

	ctx.JSON(http.StatusOK, &api.Compare{
		TotalCommits: len(ci.Commits),
		Commits:      apiCommits,
	})
}