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Prepend table preprocessor #111

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Feb 26, 2024
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67 changes: 39 additions & 28 deletions md2man/roff.go
Original file line number Diff line number Diff line change
Expand Up @@ -21,34 +21,35 @@ type roffRenderer struct {
}

const (
titleHeader = ".TH "
topLevelHeader = "\n\n.SH "
secondLevelHdr = "\n.SH "
otherHeader = "\n.SS "
crTag = "\n"
emphTag = "\\fI"
emphCloseTag = "\\fP"
strongTag = "\\fB"
strongCloseTag = "\\fP"
breakTag = "\n.br\n"
paraTag = "\n.PP\n"
hruleTag = "\n.ti 0\n\\l'\\n(.lu'\n"
linkTag = "\n\\[la]"
linkCloseTag = "\\[ra]"
codespanTag = "\\fB"
codespanCloseTag = "\\fR"
codeTag = "\n.EX\n"
codeCloseTag = "\n.EE\n"
quoteTag = "\n.PP\n.RS\n"
quoteCloseTag = "\n.RE\n"
listTag = "\n.RS\n"
listCloseTag = "\n.RE\n"
dtTag = "\n.TP\n"
dd2Tag = "\n"
tableStart = "\n.TS\nallbox;\n"
tableEnd = ".TE\n"
tableCellStart = "T{\n"
tableCellEnd = "\nT}\n"
titleHeader = ".TH "
topLevelHeader = "\n\n.SH "
secondLevelHdr = "\n.SH "
otherHeader = "\n.SS "
crTag = "\n"
emphTag = "\\fI"
emphCloseTag = "\\fP"
strongTag = "\\fB"
strongCloseTag = "\\fP"
breakTag = "\n.br\n"
paraTag = "\n.PP\n"
hruleTag = "\n.ti 0\n\\l'\\n(.lu'\n"
linkTag = "\n\\[la]"
linkCloseTag = "\\[ra]"
codespanTag = "\\fB"
codespanCloseTag = "\\fR"
codeTag = "\n.EX\n"
codeCloseTag = "\n.EE\n"
quoteTag = "\n.PP\n.RS\n"
quoteCloseTag = "\n.RE\n"
listTag = "\n.RS\n"
listCloseTag = "\n.RE\n"
dtTag = "\n.TP\n"
dd2Tag = "\n"
tableStart = "\n.TS\nallbox;\n"
tableEnd = ".TE\n"
tableCellStart = "T{\n"
tableCellEnd = "\nT}\n"
tablePreprocessor = `'\" t`
)

// NewRoffRenderer creates a new blackfriday Renderer for generating roff documents
Expand All @@ -75,6 +76,16 @@ func (r *roffRenderer) GetExtensions() blackfriday.Extensions {

// RenderHeader handles outputting the header at document start
func (r *roffRenderer) RenderHeader(w io.Writer, ast *blackfriday.Node) {
// We need to walk the tree to check if there are any tables.
// If there are, we need to enable the roff table preprocessor.
ast.Walk(func(node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
if node.Type == blackfriday.Table {
out(w, tablePreprocessor+"\n")
return blackfriday.Terminate
}
return blackfriday.GoToNext
})

// disable hyphenation
out(w, ".nh\n")
}
Expand Down
9 changes: 6 additions & 3 deletions md2man/roff_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -263,7 +263,8 @@ func TestTable(t *testing.T) {
| zebra | Sometimes black and sometimes white, depending on the stripe. |
| robin | red. |
`,
`.nh
`'\" t
.nh

.TS
allbox;
Expand Down Expand Up @@ -292,7 +293,8 @@ func TestTableWithEmptyCell(t *testing.T) {
| row one | | |
| row two | x | |
`,
`.nh
`'\" t
.nh

.TS
allbox;
Expand Down Expand Up @@ -320,7 +322,8 @@ func TestTableWrapping(t *testing.T) {
| row six | A line that's longer than 30 characters with inline ` + "`code markup`" + ` or _cursive_ should not wrap. |
| row seven | Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eu ipsum eget tortor aliquam accumsan. Quisque ac turpis convallis, sagittis urna ac, tempor est. Mauris nibh arcu, hendrerit id eros sed, sodales lacinia ex. Suspendisse sed condimentum urna, vitae mattis lectus. Mauris imperdiet magna vel purus pretium, id interdum libero. |
`,
`.nh
`'\" t
.nh

.TS
allbox;
Expand Down
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