gitech

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// Copyright 2015 The Gogs Authors. All rights reserved.
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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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	"strconv"
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	"strings"
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	"time"
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	"code.gitea.io/gitea/modules/log"
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)
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// Helper to get a signature from the commit line, which looks like:
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//
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//	full name <user@example.com> 1378823654 +0200
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//
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// Haven't found the official reference for the standard format yet.
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// This function never fails, if the "line" can't be parsed, it returns a default Signature with "zero" time.
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func parseSignatureFromCommitLine(line string) *Signature {
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	sig := &Signature{}
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	s1, sx, ok1 := strings.Cut(line, " <")
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	s2, s3, ok2 := strings.Cut(sx, "> ")
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	if !ok1 || !ok2 {
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		sig.Name = line
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		return sig
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	}
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	sig.Name, sig.Email = s1, s2
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	if strings.Count(s3, " ") == 1 {
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		ts, tz, _ := strings.Cut(s3, " ")
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		seconds, _ := strconv.ParseInt(ts, 10, 64)
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		if tzTime, err := time.Parse("-0700", tz); err == nil {
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			sig.When = time.Unix(seconds, 0).In(tzTime.Location())
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		}
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	} else {
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		// the old gitea code tried to parse the date in a few different formats, but it's not clear why.
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		// according to public document, only the standard format "timestamp timezone" could be found, so drop other formats.
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		log.Error("suspicious commit line format: %q", line)
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		for _, fmt := range []string{ /*"Mon Jan _2 15:04:05 2006 -0700"*/ } {
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			if t, err := time.Parse(fmt, s3); err == nil {
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				sig.When = t
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				break
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			}
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		}
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	}
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	return sig
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}
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