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	Improve issue references in markdown (#471)
* Improve issue references in markdown. (#3436) * Fix build * Fix lint * Fix comment typo
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					committed by
					
						
						Lunny Xiao
					
				
			
			
				
	
			
			
			
						parent
						
							2342df183b
						
					
				
				
					commit
					71634452e1
				
			@@ -91,6 +91,9 @@ var (
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	IssueNumericPattern = regexp.MustCompile(`( |^|\()#[0-9]+\b`)
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	// IssueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
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	IssueAlphanumericPattern = regexp.MustCompile(`( |^|\()[A-Z]{1,10}-[1-9][0-9]*\b`)
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	// CrossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
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	// e.g. gogits/gogs#12345
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	CrossReferenceIssueNumericPattern = regexp.MustCompile(`( |^)[0-9a-zA-Z]+/[0-9a-zA-Z]+#[0-9]+\b`)
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	// Sha1CurrentPattern matches string that represents a commit SHA, e.g. d8a994ef243349f321568f9e36d5c3f444b99cae
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	// FIXME: this pattern matches pure numbers as well, right now we do a hack to check in RenderSha1CurrentPattern
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@@ -156,7 +159,19 @@ func (r *Renderer) AutoLink(out *bytes.Buffer, link []byte, kind int) {
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			if j == -1 {
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				j = len(m)
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			}
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			out.WriteString(fmt.Sprintf(`<a href="%s">#%s</a>`, m, base.ShortSha(string(m[i+7:j]))))
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			issue := string(m[i+7 : j])
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			fullRepoURL := setting.AppURL + strings.TrimPrefix(r.urlPrefix, "/")
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			var link string
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			if strings.HasPrefix(string(m), fullRepoURL) {
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				// Use a short issue reference if the URL refers to this repository
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				link = fmt.Sprintf(`<a href="%s">#%s</a>`, m, issue)
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			} else {
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				// Use a cross-repository issue reference if the URL refers to a different repository
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				repo := string(m[len(setting.AppURL) : i-1])
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				link = fmt.Sprintf(`<a href="%s">%s#%s</a>`, m, repo, issue)
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			}
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			out.WriteString(link)
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			return
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		}
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	}
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@@ -263,6 +278,23 @@ func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string
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	return rawBytes
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}
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// RenderCrossReferenceIssueIndexPattern renders issue indexes from other repositories to corresponding links.
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func RenderCrossReferenceIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
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	ms := CrossReferenceIssueNumericPattern.FindAll(rawBytes, -1)
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	for _, m := range ms {
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		if m[0] == ' ' || m[0] == '(' {
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			m = m[1:] // ignore leading space or opening parentheses
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		}
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		repo := string(bytes.Split(m, []byte("#"))[0])
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		issue := string(bytes.Split(m, []byte("#"))[1])
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		link := fmt.Sprintf(`<a href="%s%s/issues/%s">%s</a>`, setting.AppURL, repo, issue, m)
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		rawBytes = bytes.Replace(rawBytes, m, []byte(link), 1)
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	}
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	return rawBytes
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}
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// RenderSha1CurrentPattern renders SHA1 strings to corresponding links that assumes in the same repository.
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func RenderSha1CurrentPattern(rawBytes []byte, urlPrefix string) []byte {
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	return []byte(Sha1CurrentPattern.ReplaceAllStringFunc(string(rawBytes[:]), func(m string) string {
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@@ -283,6 +315,7 @@ func RenderSpecialLink(rawBytes []byte, urlPrefix string, metas map[string]strin
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	}
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	rawBytes = RenderIssueIndexPattern(rawBytes, urlPrefix, metas)
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	rawBytes = RenderCrossReferenceIssueIndexPattern(rawBytes, urlPrefix, metas)
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	rawBytes = RenderSha1CurrentPattern(rawBytes, urlPrefix)
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	return rawBytes
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}
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