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Revision 1.115, Fri Jul 17 22:38:29 2015 UTC (8 years, 8 months ago) by schwarze
Branch: MAIN
Changes since 1.114: +2 -1 lines

Initial, still somewhat experimental implementation to leverage
less(1) -T and :t ctags(1)-like functionality to jump to the
definitions of various terms inside manual pages.
To be polished in the tree, so bear with me and report issues.

Technically, if less(1) is used as a pager, information is collected
by the mdoc(7) terminal formatter, first stored using the ohash
library, then ultimately written to a temporary file which is passed
to less via -T.  No change intended for other output formatters or
when running without a pager.

Based on an idea from Kristaps using feedback from many, in particular
phessler@ nicm@ millert@ halex@ doug@ kspillner@ deraadt@.

/*	$Id: term.h,v 1.115 2015/07/17 22:38:29 schwarze Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011-2015 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

enum	termenc {
	TERMENC_ASCII,
	TERMENC_LOCALE,
	TERMENC_UTF8
};

enum	termtype {
	TERMTYPE_CHAR,
	TERMTYPE_PS,
	TERMTYPE_PDF
};

enum	termfont {
	TERMFONT_NONE = 0,
	TERMFONT_BOLD,
	TERMFONT_UNDER,
	TERMFONT_BI,
	TERMFONT__MAX
};

#define	TERM_MAXMARGIN	  100000 /* FIXME */

struct	roff_meta;
struct	termp;

typedef void	(*term_margin)(struct termp *, const struct roff_meta *);

struct	termp_tbl {
	int		  width;	/* width in fixed chars */
	int		  decimal;	/* decimal point position */
};

struct	termp {
	enum termtype	  type;
	struct rofftbl	  tbl;		/* table configuration */
	int		  synopsisonly; /* print the synopsis only */
	int		  mdocstyle;	/* imitate mdoc(7) output */
	size_t		  line;		/* Current output line number. */
	size_t		  defindent;	/* Default indent for text. */
	size_t		  defrmargin;	/* Right margin of the device. */
	size_t		  lastrmargin;	/* Right margin before the last ll. */
	size_t		  rmargin;	/* Current right margin. */
	size_t		  maxrmargin;	/* Max right margin. */
	size_t		  maxcols;	/* Max size of buf. */
	size_t		  offset;	/* Margin offest. */
	size_t		  tabwidth;	/* Distance of tab positions. */
	size_t		  col;		/* Bytes in buf. */
	size_t		  viscol;	/* Chars on current line. */
	size_t		  trailspace;	/* See termp_flushln(). */
	int		  overstep;	/* See termp_flushln(). */
	int		  skipvsp;	/* Vertical space to skip. */
	int		  flags;
#define	TERMP_SENTENCE	 (1 << 0)	/* Space before a sentence. */
#define	TERMP_NOSPACE	 (1 << 1)	/* No space before words. */
#define	TERMP_NONOSPACE	 (1 << 2)	/* No space (no autounset). */
#define	TERMP_NBRWORD	 (1 << 3)	/* Make next word nonbreaking. */
#define	TERMP_KEEP	 (1 << 4)	/* Keep words together. */
#define	TERMP_PREKEEP	 (1 << 5)	/* ...starting with the next one. */
#define	TERMP_BACKAFTER	 (1 << 6)	/* Back up after next character. */
#define	TERMP_BACKBEFORE (1 << 7)	/* Back up before next character. */
#define	TERMP_NOBREAK	 (1 << 8)	/* See term_flushln(). */
#define	TERMP_BRIND	 (1 << 9)	/* See term_flushln(). */
#define	TERMP_DANGLE	 (1 << 10)	/* See term_flushln(). */
#define	TERMP_HANG	 (1 << 11)	/* See term_flushln(). */
#define	TERMP_NOSPLIT	 (1 << 12)	/* Do not break line before .An. */
#define	TERMP_SPLIT	 (1 << 13)	/* Break line before .An. */
#define	TERMP_NONEWLINE	 (1 << 14)	/* No line break in nofill mode. */
	int		 *buf;		/* Output buffer. */
	enum termenc	  enc;		/* Type of encoding. */
	const struct mchars *symtab;	/* Character table. */
	enum termfont	  fontl;	/* Last font set. */
	enum termfont	 *fontq;	/* Symmetric fonts. */
	int		  fontsz;	/* Allocated size of font stack */
	int		  fonti;	/* Index of font stack. */
	term_margin	  headf;	/* invoked to print head */
	term_margin	  footf;	/* invoked to print foot */
	void		(*letter)(struct termp *, int);
	void		(*begin)(struct termp *);
	void		(*end)(struct termp *);
	void		(*endline)(struct termp *);
	void		(*advance)(struct termp *, size_t);
	void		(*setwidth)(struct termp *, int, int);
	size_t		(*width)(const struct termp *, int);
	int		(*hspan)(const struct termp *,
				const struct roffsu *);
	const void	 *argf;		/* arg for headf/footf */
	struct termp_ps	 *ps;
};

__BEGIN_DECLS

struct	tbl_span;
struct	eqn;

const char	 *ascii_uc2str(int);

void		  term_eqn(struct termp *, const struct eqn *);
void		  term_tbl(struct termp *, const struct tbl_span *);
void		  term_free(struct termp *);
void		  term_newln(struct termp *);
void		  term_vspace(struct termp *);
void		  term_word(struct termp *, const char *);
void		  term_flushln(struct termp *);
void		  term_begin(struct termp *, term_margin,
			term_margin, const struct roff_meta *);
void		  term_end(struct termp *);

void		  term_setwidth(struct termp *, const char *);
int		  term_hspan(const struct termp *, const struct roffsu *);
int		  term_vspan(const struct termp *, const struct roffsu *);
size_t		  term_strlen(const struct termp *, const char *);
size_t		  term_len(const struct termp *, size_t);

void		  term_fontpush(struct termp *, enum termfont);
void		  term_fontpop(struct termp *);
void		  term_fontpopq(struct termp *, int);
void		  term_fontrepl(struct termp *, enum termfont);
void		  term_fontlast(struct termp *);

__END_DECLS