gitech

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// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package git
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import (
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	"bytes"
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	"context"
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	"os"
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	"path/filepath"
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	"strings"
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	"code.gitea.io/gitea/modules/log"
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	"code.gitea.io/gitea/modules/util"
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)
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// ReadTreeToIndex reads a treeish to the index
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func (repo *Repository) ReadTreeToIndex(treeish string, indexFilename ...string) error {
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	objectFormat, err := repo.GetObjectFormat()
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	if err != nil {
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		return err
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	}
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	if len(treeish) != objectFormat.FullLength() {
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		res, _, err := NewCommand(repo.Ctx, "rev-parse", "--verify").AddDynamicArguments(treeish).RunStdString(&RunOpts{Dir: repo.Path})
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		if err != nil {
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			return err
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		}
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		if len(res) > 0 {
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			treeish = res[:len(res)-1]
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		}
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	}
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	id, err := NewIDFromString(treeish)
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	if err != nil {
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		return err
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	}
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	return repo.readTreeToIndex(id, indexFilename...)
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}
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func (repo *Repository) readTreeToIndex(id ObjectID, indexFilename ...string) error {
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	var env []string
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	if len(indexFilename) > 0 {
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		env = append(os.Environ(), "GIT_INDEX_FILE="+indexFilename[0])
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	}
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	_, _, err := NewCommand(repo.Ctx, "read-tree").AddDynamicArguments(id.String()).RunStdString(&RunOpts{Dir: repo.Path, Env: env})
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	if err != nil {
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		return err
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	}
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	return nil
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}
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// ReadTreeToTemporaryIndex reads a treeish to a temporary index file
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func (repo *Repository) ReadTreeToTemporaryIndex(treeish string) (filename, tmpDir string, cancel context.CancelFunc, err error) {
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	tmpDir, err = os.MkdirTemp("", "index")
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	if err != nil {
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		return filename, tmpDir, cancel, err
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	}
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	filename = filepath.Join(tmpDir, ".tmp-index")
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	cancel = func() {
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		err := util.RemoveAll(tmpDir)
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		if err != nil {
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			log.Error("failed to remove tmp index file: %v", err)
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		}
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	}
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	err = repo.ReadTreeToIndex(treeish, filename)
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	if err != nil {
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		defer cancel()
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		return "", "", func() {}, err
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	}
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	return filename, tmpDir, cancel, err
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}
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// EmptyIndex empties the index
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func (repo *Repository) EmptyIndex() error {
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	_, _, err := NewCommand(repo.Ctx, "read-tree", "--empty").RunStdString(&RunOpts{Dir: repo.Path})
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	return err
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}
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// LsFiles checks if the given filenames are in the index
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func (repo *Repository) LsFiles(filenames ...string) ([]string, error) {
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	cmd := NewCommand(repo.Ctx, "ls-files", "-z").AddDashesAndList(filenames...)
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	res, _, err := cmd.RunStdBytes(&RunOpts{Dir: repo.Path})
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	if err != nil {
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		return nil, err
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	}
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	filelist := make([]string, 0, len(filenames))
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	for _, line := range bytes.Split(res, []byte{'\000'}) {
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		filelist = append(filelist, string(line))
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	}
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	return filelist, err
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}
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// RemoveFilesFromIndex removes given filenames from the index - it does not check whether they are present.
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func (repo *Repository) RemoveFilesFromIndex(filenames ...string) error {
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	objectFormat, err := repo.GetObjectFormat()
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	if err != nil {
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		return err
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	}
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	cmd := NewCommand(repo.Ctx, "update-index", "--remove", "-z", "--index-info")
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	stdout := new(bytes.Buffer)
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	stderr := new(bytes.Buffer)
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	buffer := new(bytes.Buffer)
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	for _, file := range filenames {
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		if file != "" {
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			buffer.WriteString("0 ")
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			buffer.WriteString(objectFormat.EmptyObjectID().String())
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			buffer.WriteByte('\t')
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			buffer.WriteString(file)
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			buffer.WriteByte('\000')
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		}
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	}
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	return cmd.Run(&RunOpts{
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		Dir:    repo.Path,
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		Stdin:  bytes.NewReader(buffer.Bytes()),
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		Stdout: stdout,
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		Stderr: stderr,
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	})
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}
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// AddObjectToIndex adds the provided object hash to the index at the provided filename
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func (repo *Repository) AddObjectToIndex(mode string, object ObjectID, filename string) error {
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	cmd := NewCommand(repo.Ctx, "update-index", "--add", "--replace", "--cacheinfo").AddDynamicArguments(mode, object.String(), filename)
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	_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
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	return err
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}
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// WriteTree writes the current index as a tree to the object db and returns its hash
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func (repo *Repository) WriteTree() (*Tree, error) {
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	stdout, _, runErr := NewCommand(repo.Ctx, "write-tree").RunStdString(&RunOpts{Dir: repo.Path})
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	if runErr != nil {
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		return nil, runErr
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	}
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	id, err := NewIDFromString(strings.TrimSpace(stdout))
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	if err != nil {
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		return nil, err
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	}
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	return NewTree(repo, id), nil
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}
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