===================================================================
RCS file: /cvs/pod2mdoc/pod2mdoc.c,v
retrieving revision 1.8
retrieving revision 1.17
diff -u -p -r1.8 -r1.17
--- pod2mdoc/pod2mdoc.c	2014/03/23 23:57:38	1.8
+++ pod2mdoc/pod2mdoc.c	2014/04/02 20:32:41	1.17
@@ -1,4 +1,4 @@
-/*	$Id: pod2mdoc.c,v 1.8 2014/03/23 23:57:38 kristaps Exp $ */
+/*	$Id: pod2mdoc.c,v 1.17 2014/04/02 20:32:41 kristaps Exp $ */
 /*
  * Copyright (c) 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -26,6 +26,11 @@
 #include <string.h>
 #include <unistd.h>
 
+/*
+ * In what section can we find Perl manuals?
+ */
+#define	PERL_SECTION	"3p"
+
 struct	args {
 	const char	*title; /* override "Dt" title */
 	const char	*date; /* override "Dd" date */
@@ -39,11 +44,17 @@ enum	list {
 	LIST__MAX
 };
 
+enum	sect {
+	SECT_NONE = 0,
+	SECT_NAME, /* NAME section */
+	SECT_SYNOPSIS, /* SYNOPSIS section */
+};
+
 struct	state {
 	int		 parsing; /* after =cut of before command */
 	int		 paused; /* in =begin and before =end */
 	int		 haspar; /* in paragraph: do we need Pp? */
-	int		 isname; /* are we the NAME section? */
+	enum sect	 sect; /* which section are we in? */
 	const char	*fname; /* file being parsed */
 #define	LIST_STACKSZ	 128
 	enum list	 lstack[LIST_STACKSZ]; /* open lists */
@@ -158,6 +169,143 @@ formatescape(const char *buf, size_t *start, size_t en
 }
 
 /*
+ * Run some heuristics to intuit a link format.
+ * I recognise L<foo::bar> as a Perl manpage, printing it in section 3p;
+ * or a general UNIX foo(5) manpage.
+ * If I recognise one, I set "start" to be the end of the sequence so
+ * that the caller can safely just continue processing.
+ * Otherwise, I don't touch "start".
+ */
+static int
+trylink(const char *buf, size_t *start, size_t end, size_t dsz)
+{
+	size_t		sv, nstart, nend, i, j;
+	int		hasdouble;
+
+	/* 
+	 * Scan to the start of the terminus. 
+	 * This function is more or less replicated in the formatcode()
+	 * for null or index formatting codes.
+	 */
+	hasdouble = 0;
+	for (sv = nstart = *start; nstart < end; nstart++) {
+		/* Do we have a double-colon? */
+		if (':' == buf[nstart] && 
+			nstart > sv &&
+			':' == buf[nstart - 1])
+			hasdouble = 1;
+		if ('>' != buf[nstart])
+			continue;
+		else if (dsz == 1)
+			break;
+		assert(nstart > 0);
+		if (' ' != buf[nstart - 1])
+			continue;
+		i = nstart;
+		for (j = 0; i < end && j < dsz; j++) 
+			if ('>' != buf[i++])
+				break;
+		if (dsz == j) 
+			break;
+	}
+	
+	/* We don't care about stubs. */
+	if (nstart == end || nstart == *start)
+		return(0);
+
+	/* Set nend to the end of content. */
+	nend = nstart;
+	if (dsz > 1)
+		nend--;
+
+	/*
+	 * Provide for some common invocations of the link primitive.
+	 * First, allow us to link to other Perl manuals.
+	 */
+	if (hasdouble)
+		printf("Xr %.*s " PERL_SECTION, 
+			(int)(nend - sv), &buf[sv]);
+	else if (nend - sv > 3 && isalnum(buf[sv]) && 
+			')' == buf[nend - 1] && 
+			isdigit((int)buf[nend - 2]) &&
+			'(' == buf[nend - 3]) 
+		printf("Xr %.*s %c", 
+			(int)(nend - 3 - sv),
+			&buf[sv], buf[nend - 2]);
+	else
+		return(0);
+
+	*start = nstart;
+	return(1);
+}
+
+/*
+ * Doclifting: if we're a bold "-xx" and we're in the SYNOPSIS section,
+ * then it's likely that we're a flag.
+ * Our flag might be followed by an argument, so make sure that we're
+ * accounting for that, too.
+ * If we don't have a flag at all, however, then assume we're an "Ar".
+ */
+static void
+dosynopsisfl(const char *buf, size_t *start, size_t end)
+{
+	size_t	 i;
+again:
+	assert(*start + 1 < end);
+	assert('-' == buf[*start]);
+
+	if ( ! isalnum((int)buf[*start + 1]) &&
+		'?' != buf[*start + 1] &&
+		'-' != buf[*start + 1]) {
+		(*start)--;
+		fputs("Ar ", stdout);
+		return;
+	}
+
+	(*start)++;
+	for (i = *start; i < end; i++)
+		if (isalnum((int)buf[i]))
+			continue;
+		else if ('?' == buf[i])
+			continue;
+		else if ('-' == buf[i])
+			continue;
+		else if ('_' == buf[i])
+			continue;
+		else
+			break;
+
+	assert(i < end);
+
+	if ( ! (' ' == buf[i] || '>' == buf[i])) {
+		printf("Ar ");
+		return;
+	}
+
+	printf("Fl ");
+	if (end - *start > 1 && 
+		isupper((int)buf[*start]) &&
+		islower((int)buf[*start + 1]) &&
+		(end - *start == 2 ||
+		 ' ' == buf[*start + 2]))
+		printf("\\&");
+	printf("%.*s ", (int)(i - *start), &buf[*start]);
+	*start = i;
+
+	if (' ' == buf[i]) {
+		while (i < end && ' ' == buf[i])
+			i++;
+		assert(i < end);
+		if ('-' == buf[i]) {
+			*start = i;
+			goto again;
+		}
+		printf("Ar ");
+		*start = i;
+	}
+}
+
+/*
  * We're at the character in front of a format code, which is structured
  * like X<...> and can contain nested format codes.
  * This consumes the whole format code, and any nested format codes, til
@@ -166,13 +314,16 @@ formatescape(const char *buf, size_t *start, size_t en
  * been printed to the current line.
  * If "nomacro", then we don't print any macros, just contained data
  * (e.g., following "Sh" or "Nm").
+ * "pos" is only significant in SYNOPSIS, and should be 0 when invoked
+ * as the first format code on a line (for decoration as an "Nm"),
+ * non-zero otherwise.
  * Return whether we've printed a macro or not--in other words, whether
  * this should trigger a subsequent newline (this should be ignored when
  * reentrant).
  */
 static int
-formatcode(const char *buf, size_t *start, 
-	size_t end, int reentrant, int nomacro)
+formatcode(struct state *st, const char *buf, size_t *start, 
+	size_t end, int reentrant, int nomacro, int pos)
 {
 	enum fmt	 fmt;
 	size_t		 i, j, dsz;
@@ -278,19 +429,28 @@ formatcode(const char *buf, size_t *start, 
 			printf("Em ");
 			break;
 		case (FMT_BOLD):
+			if (SECT_SYNOPSIS == st->sect) { 
+				if (1 == dsz && '-' == buf[*start])
+					dosynopsisfl(buf, start, end);
+				else if (0 == pos)
+					printf("Nm ");
+				else
+					printf("Ar ");
+				break;
+			} 
 			printf("Sy ");
 			break;
 		case (FMT_CODE):
 			printf("Qo Li ");
 			break;
 		case (FMT_LINK):
-			printf("Lk ");
+			if ( ! trylink(buf, start, end, dsz))
+				printf("No ");
 			break;
 		case (FMT_FILE):
 			printf("Pa ");
 			break;
 		case (FMT_NBSP):
-			/* TODO. */
 			printf("No ");
 			break;
 		default:
@@ -326,7 +486,7 @@ formatcode(const char *buf, size_t *start, 
 			}
 		}
 		if (*start + 1 < end && '<' == buf[*start + 1]) {
-			formatcode(buf, start, end, 1, nomacro);
+			formatcode(st, buf, start, end, 1, nomacro, 1);
 			continue;
 		}
 
@@ -381,13 +541,14 @@ formatcode(const char *buf, size_t *start, 
  * Calls formatcode() til the end of a paragraph.
  */
 static void
-formatcodeln(const char *buf, size_t *start, size_t end, int nomacro)
+formatcodeln(struct state *st, const char *buf, 
+	size_t *start, size_t end, int nomacro)
 {
 
 	last = ' ';
 	while (*start < end)  {
 		if (*start + 1 < end && '<' == buf[*start + 1]) {
-			formatcode(buf, start, end, 1, nomacro);
+			formatcode(st, buf, start, end, 1, nomacro, 1);
 			continue;
 		}
 		/*
@@ -487,24 +648,28 @@ command(struct state *st, const char *buf, size_t star
 		 * how pod2man handles it.
 		 */
 		printf(".Sh ");
-		st->isname = 0;
-		if (end - start == 4)
+		st->sect = SECT_NONE;
+		if (end - start == 4) {
 			if (0 == memcmp(&buf[start], "NAME", 4))
-				st->isname = 1;
-		formatcodeln(buf, &start, end, 1);
+				st->sect = SECT_NAME;
+		} else if (end - start == 8) {
+			if (0 == memcmp(&buf[start], "SYNOPSIS", 8))
+				st->sect = SECT_SYNOPSIS;
+		} 
+		formatcodeln(st, buf, &start, end, 1);
 		putchar('\n');
 		st->haspar = 1;
 		break;
 	case (CMD_HEAD2):
 		printf(".Ss ");
-		formatcodeln(buf, &start, end, 1);
+		formatcodeln(st, buf, &start, end, 1);
 		putchar('\n');
 		st->haspar = 1;
 		break;
 	case (CMD_HEAD3):
 		puts(".Pp");
 		printf(".Em ");
-		formatcodeln(buf, &start, end, 0);
+		formatcodeln(st, buf, &start, end, 0);
 		putchar('\n');
 		puts(".Pp");
 		st->haspar = 1;
@@ -512,7 +677,7 @@ command(struct state *st, const char *buf, size_t star
 	case (CMD_HEAD4):
 		puts(".Pp");
 		printf(".No ");
-		formatcodeln(buf, &start, end, 0);
+		formatcodeln(st, buf, &start, end, 0);
 		putchar('\n');
 		puts(".Pp");
 		st->haspar = 1;
@@ -566,7 +731,7 @@ command(struct state *st, const char *buf, size_t star
 		switch (st->lstack[st->lpos - 1]) {
 		case (LIST_TAG):
 			printf(".It ");
-			formatcodeln(buf, &start, end, 0);
+			formatcodeln(st, buf, &start, end, 0);
 			putchar('\n');
 			break;
 		case (LIST_ENUM):
@@ -646,6 +811,95 @@ verbatim(struct state *st, const char *buf, size_t sta
 }
 
 /*
+ * See dosynopsisop().
+ */
+static int
+hasmatch(const char *buf, size_t start, size_t end)
+{
+	size_t	 stack;
+
+	for (stack = 0; start < end; start++) 
+		if (buf[start] == '[')
+			stack++;
+		else if (buf[start] == ']' && 0 == stack)
+			return(1);
+		else if (buf[start] == ']')
+			stack--;
+	return(0);
+}
+
+/*
+ * If we're in the SYNOPSIS section and we've encounter braces in an
+ * ordinary paragraph, then try to see whether we're an [-option].
+ * Do this, if we're an opening bracket, by first seeing if we have a
+ * matching end via hasmatch().
+ * If we're an ending bracket, see if we have a stack already.
+ */
+static int
+dosynopsisop(const char *buf, int *last,
+	size_t *start, size_t end, size_t *opstack)
+{
+
+	assert('[' == buf[*start] || ']' == buf[*start]);
+
+	if ('[' == buf[*start] && hasmatch(buf, *start + 1, end)) {
+		if ('\n' != *last)
+			putchar('\n');
+		puts(".Oo");
+		(*opstack)++;
+	} else if ('[' == buf[*start])
+		return(0);
+
+	if (']' == buf[*start] && *opstack > 0) {
+		if ('\n' != *last)
+			putchar('\n');
+		puts(".Oc");
+		(*opstack)--;
+	} else if (']' == buf[*start])
+		return(0);
+
+	(*start)++;
+	*last = '\n';
+	while (' ' == buf[*start])
+		(*start)++;
+	return(1);
+}
+
+/*
+ * Format multiple "Nm" manpage names in the NAME section.
+ */
+static void
+donamenm(struct state *st, const char *buf, size_t *start, size_t end)
+{
+	size_t	 word;
+
+	while (*start < end && ' ' == buf[*start])
+		(*start)++;
+
+	if (end == *start) {
+		puts(".Nm unknown");
+		return;
+	}
+
+	while (*start < end) {
+		fputs(".Nm ", stdout);
+		for (word = *start; word < end; word++)
+			if (',' == buf[word])
+				break;
+		formatcodeln(st, buf, start, word, 1);
+		if (*start == end) {
+			putchar('\n');
+			continue;
+		}
+		assert(',' == buf[*start]);
+		puts(" ,");
+		(*start)++;
+		while (*start < end && ' ' == buf[*start])
+			(*start)++;
+	}
+}
+
+/*
  * Ordinary paragraph.
  * Well, this is really the hardest--POD seems to assume that, for
  * example, a leading space implies a newline, and so on.
@@ -656,7 +910,8 @@ verbatim(struct state *st, const char *buf, size_t sta
 static void
 ordinary(struct state *st, const char *buf, size_t start, size_t end)
 {
-	size_t		i, j;
+	size_t		i, j, opstack;
+	int		seq;
 
 	if ( ! st->parsing || st->paused)
 		return;
@@ -667,9 +922,9 @@ ordinary(struct state *st, const char *buf, size_t sta
 	 * we're in "name - description" format.
 	 * To wit, print out a "Nm" and "Nd" in that format.
 	 */
-	if (st->isname) {
-		for (i = end - 1; i > start; i--)
-			if ('-' == buf[i])
+	if (SECT_NAME == st->sect) {
+		for (i = end - 2; i > start; i--)
+			if ('-' == buf[i] && ' ' == buf[i + 1])
 				break;
 		if ('-' == buf[i]) {
 			j = i;
@@ -677,12 +932,12 @@ ordinary(struct state *st, const char *buf, size_t sta
 			for ( ; i > start; i--)
 				if ('-' != buf[i])
 					break;
-			printf(".Nm ");
-			formatcodeln(buf, &start, i + 1, 1);
-			putchar('\n');
+			donamenm(st, buf, &start, i + 1);
 			start = j + 1;
-			printf(".Nd ");
-			formatcodeln(buf, &start, end, 1);
+			while (start < end && ' ' == buf[start])
+				start++;
+			fputs(".Nd ", stdout);
+			formatcodeln(st, buf, &start, end, 1);
 			putchar('\n');
 			return;
 		}
@@ -693,8 +948,9 @@ ordinary(struct state *st, const char *buf, size_t sta
 
 	st->haspar = 0;
 	last = '\n';
+	opstack = 0;
 
-	while (start < end) {
+	for (seq = 0; start < end; seq++) {
 		/* 
 		 * Loop til we get either to a newline or escape. 
 		 * Escape initial control characters.
@@ -708,6 +964,17 @@ ordinary(struct state *st, const char *buf, size_t sta
 				printf("\\&");
 			else if ('\n' == last && '\'' == buf[start])
 				printf("\\&");
+			/*
+			 * If we're in the SYNOPSIS, have square
+			 * brackets indicate that we're opening and
+			 * closing an optional context.
+			 */
+			if (SECT_SYNOPSIS == st->sect &&
+				('[' == buf[start] || 
+				 ']' == buf[start]) &&
+				dosynopsisop(buf, &last, 
+					&start, end, &opstack))
+				continue;
 			putchar(last = buf[start++]);
 			if ('\\' == last)
 				putchar('e');
@@ -722,8 +989,19 @@ ordinary(struct state *st, const char *buf, size_t sta
 			 * following that, a newline.
 			 * Consume all whitespace so we don't
 			 * accidentally start an implicit literal line.
+			 * If the macro ends with a flush comma or
+			 * period, let mdoc(7) handle it for us.
 			 */
-			if (formatcode(buf, &start, end, 0, 0)) {
+			if (formatcode(st, buf, &start, end, 0, 0, seq)) {
+				if ((start == end - 1 || 
+					(start < end - 1 && 
+					 (' ' == buf[start + 1] ||
+					  '\n' == buf[start + 1]))) &&
+					('.' == buf[start] ||
+					 ',' == buf[start])) {
+					putchar(' ');
+					putchar(buf[start++]);
+				}
 				putchar(last = '\n');
 				while (start < end && ' ' == buf[start])
 					start++;
@@ -752,19 +1030,7 @@ ordinary(struct state *st, const char *buf, size_t sta
 			for ( ; start < end; start++)
 				if (' ' != buf[start] && '\t' != buf[start])
 					break;
-		} else if (start < end) {
-			/* 
-			 * Default: print the character. 
-			 * Escape initial control characters.
-			 */
-			if ('\n' == last && '.' == buf[start])
-				printf("\\&");
-			else if ('\n' == last && '\'' == buf[start])
-				printf("\\&");
-			putchar(last = buf[start++]);
-			if ('\\' == last)
-				putchar('e');
-		}
+		} 
 	}
 
 	if (last != '\n')
@@ -828,7 +1094,7 @@ dofile(const struct args *args, const char *fname, 
 		if (NULL != (cp = strrchr(title, '.'))) {
 			*cp++ = '\0';
 			if (0 == strcmp(cp, "pm"))
-				section = "3p";
+				section = PERL_SECTION;
 		}
 	}