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package main
import (
"bytes"
"fmt"
"strings"
"time"
"github.com/go-git/go-git/v5/plumbing/object"
"go.lindenii.runxiyu.org/lindenii-common/misc"
)
// get_patch_from_commit formats a commit object as if it was returned by
// git-format-patch.
func format_patch_from_commit(commit *object.Commit) (string, error) {
_, patch, err := get_patch_from_commit(commit)
if err != nil {
return "", misc.Wrap_one_error(err_getting_patch_of_commit, err)
}
var buf bytes.Buffer
author := commit.Author
date := author.When.Format(time.RFC1123Z)
commit_msg_title, commit_msg_details, _ := strings.Cut(commit.Message, "\n")
// This date is hardcoded in Git.
fmt.Fprintf(&buf, "From %s Mon Sep 17 00:00:00 2001\n", commit.Hash)
fmt.Fprintf(&buf, "From: %s <%s>\n", author.Name, author.Email)
fmt.Fprintf(&buf, "Date: %s\n", date)
fmt.Fprintf(&buf, "Subject: [PATCH] %s\n\n", commit_msg_title)
if commit_msg_details != "" {
commit_msg_details_first_line, commit_msg_details_rest, _ := strings.Cut(commit_msg_details, "\n")
if strings.TrimSpace(commit_msg_details_first_line) == "" {
commit_msg_details = commit_msg_details_rest
}
buf.WriteString(commit_msg_details)
buf.WriteString("\n")
}
buf.WriteString("---\n")
fmt.Fprint(&buf, patch.Stats().String())
fmt.Fprintln(&buf)
buf.WriteString(patch.String())
fmt.Fprintf(&buf, "\n-- \n2.48.1\n")
return buf.String(), nil
}
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