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Ensure empty lines are copiable and final new line too (#16678)

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* Ensure empty lines are copiable and final new line too

When files are highlighted the newline character needs to be added in a whitespace
compliant mode. Also ensure the final empty newline is rendered.

Fix #16434

* Add test and ensure spans closed

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-08-14 00:16:56 +01:00 • committed by GitHub
parent a4962a9440
commit 23a87a003e
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2 changed files with 116 additions and 0 deletions
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13
modules/highlight/highlight.go
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@ -166,6 +166,11 @@ func File(numLines int, fileName string, code []byte) map[int]string {
}
htmlw.Flush()
finalNewLine := false
if len(code) > 0 {
finalNewLine = code[len(code)-1] == '\n'
}
m := make(map[int]string, numLines)
for k, v := range strings.SplitN(htmlbuf.String(), "\n", numLines) {
line := k + 1
@ -173,9 +178,17 @@ func File(numLines int, fileName string, code []byte) map[int]string {
//need to keep lines that are only \n so copy/paste works properly in browser
if content == "" {
content = "\n"
} else if content == `</span><span class="w">` {
content += "\n</span>"
}
content = strings.TrimSuffix(content, `<span class="w">`)
content = strings.TrimPrefix(content, `</span>`)
m[line] = content
}
if finalNewLine {
m[numLines+1] = "<span class=\"w\">\n</span>"
}
return m
}