mdocml: Make `-w' mode work much better.

mdocml: Make `-w' mode work much better.

[kristaps]

Log Message:
-----------
Make `-w' mode work much better.  This is INCREDIBLY poorly specified in
any other deroff manual, and as I don't think anybody actually uses
deroff, I don't feel compelled to research its behaviour too much and
can just do what's logical.

Modified Files:
--------------
    mdocml:
        demandoc.1
        demandoc.c

Revision Data
-------------
Index: demandoc.1
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/demandoc.1,v
retrieving revision 1.2
retrieving revision 1.3
diff -Ldemandoc.1 -Ldemandoc.1 -u -p -r1.2 -r1.3
--- demandoc.1
+++ demandoc.1
@@ -39,9 +39,10 @@ Its arguments are as follows:
 Output a word list.
 This outputs each word of text on its own line.
 A
-.Qq word
-starts with at least two letters and consists of at least three letters
-total.
+.Qq word ,
+in this case, refers to whitespace-delimited terms beginning with at
+least two letters after opening punctuation and not consisting of any
+escape sequences.
 .It Ar
 The input files.
 .El
@@ -51,12 +52,13 @@ If
 is not provided,
 .Nm
 accepts standard input.
+If a document is not well-formed, it is skipped.
 .Pp
 By default,
 .Nm
 parses its input and outputs only text nodes, preserving line column
 position.
-If a document is not well-formed, it is skipped.
+Escape sequences are omitted from the output.
 .Pp
 The
 .Fl i ,
Index: demandoc.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/demandoc.c,v
retrieving revision 1.4
retrieving revision 1.5
diff -Ldemandoc.c -Ldemandoc.c -u -p -r1.4 -r1.5
--- demandoc.c
+++ demandoc.c
@@ -121,7 +121,8 @@ pmandoc(struct mparse *mp, int fd, const
 	else
 		return;
 
-	putchar('\n');
+	if ( ! list)
+		putchar('\n');
 }
 
 /*
@@ -131,12 +132,58 @@ static void
 pstring(const char *p, int col, int *colp, int list)
 {
 	enum mandoc_esc	 esc;
+	const char	*start;
+	int		 emit;
+
+	/*
+	 * Print as many column spaces til we achieve parity with the
+	 * input document.
+	 */
+
+again:
+	if (list && '\0' != *p) {
+		while (isspace((unsigned char)*p))
+			p++;
+
+		while ('\'' == *p || '(' == *p || '"' == *p)
+			p++;
+
+		emit = isalpha((unsigned char)p[0]) &&
+			isalpha((unsigned char)p[1]);
+
+		for (start = p; '\0' != *p; p++)
+			if ('\\' == *p) {
+				p++;
+				esc = mandoc_escape(&p, NULL, NULL);
+				if (ESCAPE_ERROR == esc)
+					return;
+				emit = 0;
+			} else if (isspace((unsigned char)*p))
+				break;
+
+		if (emit && p - start >= 2) {
+			for ( ; start != p; start++)
+				if (ASCII_HYPH == *start)
+					putchar('-');
+				else
+					putchar((unsigned char)*start);
+			putchar('\n');
+		}
+
+		if (isspace((unsigned char)*p))
+			goto again;
+
+		return;
+	}
 
 	while (*colp < col) {
 		putchar(' ');
 		(*colp)++;
 	}
 
+	/*
+	 * Print the input word, skipping any special characters.
+	 */
 	while ('\0' != *p) 
 		if ('\\' == *p) {
 			p++;
@@ -152,6 +199,14 @@ pstring(const char *p, int col, int *col
 static void
 pline(int line, int *linep, int *col, int list)
 {
+
+	if (list)
+		return;
+
+	/*
+	 * Print out as many lines as needed to reach parity with the
+	 * original input. 
+	 */
 
 	while (*linep < line) {
 		putchar('\n');
--
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