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opttbl.c

/*
 * Copyright (C) 1984-2004  Mark Nudelman
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information about less, or for information on how to 
 * contact the author, see the README file.
 */


/*
 * The option table.
 */

#include "less.h"
#include "option.h"

/*
 * Variables controlled by command line options.
 */
public int quiet;       /* Should we suppress the audible bell? */
public int how_search;        /* Where should forward searches start? */
public int top_scroll;        /* Repaint screen from top?
                           (alternative is scroll from bottom) */
public int pr_type;           /* Type of prompt (short, medium, long) */
public int bs_mode;           /* How to process backspaces */
public int know_dumb;         /* Don't complain about dumb terminals */
public int quit_at_eof;       /* Quit after hitting end of file twice */
public int quit_if_one_screen;      /* Quit if EOF on first screen */
public int squeeze;           /* Squeeze multiple blank lines into one */
public int tabstop;           /* Tab settings */
public int back_scroll;       /* Repaint screen on backwards movement */
public int forw_scroll;       /* Repaint screen on forward movement */
public int caseless;          /* Do "caseless" searches */
public int linenums;          /* Use line numbers */
public int autobuf;           /* Automatically allocate buffers as needed */
public int bufspace;          /* Max buffer space per file (K) */
public int ctldisp;           /* Send control chars to screen untranslated */
public int force_open;        /* Open the file even if not regular file */
public int swindow;           /* Size of scrolling window */
public int jump_sline;        /* Screen line of "jump target" */
public int chopline;          /* Truncate displayed lines at screen width */
public int no_init;           /* Disable sending ti/te termcap strings */
public int no_keypad;         /* Disable sending ks/ke termcap strings */
public int twiddle;             /* Show tildes after EOF */
public int show_attn;         /* Hilite first unread line */
public int shift_count;       /* Number of positions to shift horizontally */
public int status_col;        /* Display a status column */
public int use_lessopen;      /* Use the LESSOPEN filter */
public int quit_on_intr;      /* Quit on interrupt */
#if HILITE_SEARCH
public int hilite_search;     /* Highlight matched search patterns? */
#endif

public int less_is_more = 0;  /* Make compatible with POSIX more */

/*
 * Long option names.
 */
static struct optname a_optname      = { "search-skip-screen",   NULL };
static struct optname b_optname      = { "buffers",              NULL };
static struct optname B__optname     = { "auto-buffers",         NULL };
static struct optname c_optname      = { "clear-screen",         NULL };
static struct optname d_optname      = { "dumb",                 NULL };
#if MSDOS_COMPILER
static struct optname D__optname     = { "color",                NULL };
#endif
static struct optname e_optname      = { "quit-at-eof",          NULL };
static struct optname f_optname      = { "force",                NULL };
static struct optname F__optname     = { "quit-if-one-screen",   NULL };
#if HILITE_SEARCH
static struct optname g_optname      = { "hilite-search",        NULL };
#endif
static struct optname h_optname      = { "max-back-scroll",      NULL };
static struct optname i_optname      = { "ignore-case",          NULL };
static struct optname j_optname      = { "jump-target",          NULL };
static struct optname J__optname     = { "status-column",        NULL };
#if USERFILE
static struct optname k_optname      = { "lesskey-file",         NULL };
#endif
static struct optname K__optname     = { "quit-on-intr",         NULL };
static struct optname L__optname     = { "no-lessopen",          NULL };
static struct optname m_optname      = { "long-prompt",          NULL };
static struct optname n_optname      = { "line-numbers",         NULL };
#if LOGFILE
static struct optname o_optname      = { "log-file",             NULL };
static struct optname O__optname     = { "LOG-FILE",             NULL };
#endif
static struct optname p_optname      = { "pattern",              NULL };
static struct optname P__optname     = { "prompt",               NULL };
static struct optname q2_optname     = { "silent",               NULL };
static struct optname q_optname      = { "quiet",                &q2_optname };
static struct optname r_optname      = { "raw-control-chars",    NULL };
static struct optname s_optname      = { "squeeze-blank-lines",  NULL };
static struct optname S__optname     = { "chop-long-lines",      NULL };
#if TAGS
static struct optname t_optname      = { "tag",                  NULL };
static struct optname T__optname     = { "tag-file",             NULL };
#endif
static struct optname u_optname      = { "underline-special",    NULL };
static struct optname V__optname     = { "version",              NULL };
static struct optname w_optname      = { "hilite-unread",        NULL };
static struct optname x_optname      = { "tabs",                 NULL };
static struct optname X__optname     = { "no-init",              NULL };
static struct optname y_optname      = { "max-forw-scroll",      NULL };
static struct optname z_optname      = { "window",               NULL };
static struct optname quote_optname  = { "quotes",               NULL };
static struct optname tilde_optname  = { "tilde",                NULL };
static struct optname query_optname  = { "help",                 NULL };
static struct optname pound_optname  = { "shift",                NULL };
static struct optname keypad_optname = { "no-keypad",            NULL };


/*
 * Table of all options and their semantics.
 *
 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
 * the description of the option when set to 0, 1 or 2, respectively.
 * For NUMBER options, odesc[0] is the prompt to use when entering
 * a new value, and odesc[1] is the description, which should contain 
 * one %d which is replaced by the value of the number.
 * For STRING options, odesc[0] is the prompt to use when entering
 * a new value, and odesc[1], if not NULL, is the set of characters
 * that are valid in the string.
 */
static struct loption option[] =
{
      { 'a', &a_optname,
            BOOL, OPT_OFF, &how_search, NULL,
            {
                  "Search includes displayed screen",
                  "Search skips displayed screen",
                  NULL
            }
      },

      { 'b', &b_optname,
            NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 
            {
                  "Max buffer space per file (K): ",
                  "Max buffer space per file: %dK",
                  NULL
            }
      },
      { 'B', &B__optname,
            BOOL, OPT_ON, &autobuf, NULL,
            {
                  "Don't automatically allocate buffers",
                  "Automatically allocate buffers when needed",
                  NULL
            }
      },
      { 'c', &c_optname,
            TRIPLE, OPT_OFF, &top_scroll, NULL,
            {
                  "Repaint by scrolling from bottom of screen",
                  "Repaint by clearing each line",
                  "Repaint by painting from top of screen"
            }
      },
      { 'd', &d_optname,
            BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
            {
                  "Assume intelligent terminal",
                  "Assume dumb terminal",
                  NULL
            }
      },
#if MSDOS_COMPILER
      { 'D', &D__optname,
            STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
            {
                  "color desc: ", 
                  "Ddknsu0123456789.",
                  NULL
            }
      },
#endif
      { 'e', &e_optname,
            TRIPLE, OPT_OFF, &quit_at_eof, NULL,
            {
                  "Don't quit at end-of-file",
                  "Quit at end-of-file",
                  "Quit immediately at end-of-file"
            }
      },
      { 'f', &f_optname,
            BOOL, OPT_OFF, &force_open, NULL,
            {
                  "Open only regular files",
                  "Open even non-regular files",
                  NULL
            }
      },
      { 'F', &F__optname,
            BOOL, OPT_OFF, &quit_if_one_screen, NULL,
            {
                  "Don't quit if end-of-file on first screen",
                  "Quit if end-of-file on first screen",
                  NULL
            }
      },
#if HILITE_SEARCH
      { 'g', &g_optname,
            TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
            {
                  "Don't highlight search matches",
                  "Highlight matches for previous search only",
                  "Highlight all matches for previous search pattern",
            }
      },
#endif
      { 'h', &h_optname,
            NUMBER, -1, &back_scroll, NULL,
            {
                  "Backwards scroll limit: ",
                  "Backwards scroll limit is %d lines",
                  NULL
            }
      },
      { 'i', &i_optname,
            TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
            {
                  "Case is significant in searches",
                  "Ignore case in searches",
                  "Ignore case in searches and in patterns"
            }
      },
      { 'j', &j_optname,
            NUMBER, 1, &jump_sline, NULL,
            {
                  "Target line: ",
                  "Position target at screen line %d",
                  NULL
            }
      },
      { 'J', &J__optname,
            BOOL|REPAINT, OPT_OFF, &status_col, NULL,
            {
                  "Don't display a status column",
                  "Display a status column",
                  NULL
            }
      },
#if USERFILE
      { 'k', &k_optname,
            STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
            { NULL, NULL, NULL }
      },
#endif
      { 'K', &K__optname,
            BOOL, OPT_OFF, &quit_on_intr, NULL,
            {
                  "Interrupt (ctrl-C) returns to prompt",
                  "Interrupt (ctrl-C) exits less",
                  NULL
            }
      },
      { 'l', NULL,
            STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l,
            { NULL, NULL, NULL }
      },
      { 'L', &L__optname,
            BOOL, OPT_ON, &use_lessopen, NULL,
            {
                  "Don't use the LESSOPEN filter",
                  "Use the LESSOPEN filter",
                  NULL
            }
      },
      { 'm', &m_optname,
            TRIPLE, OPT_OFF, &pr_type, NULL,
            {
                  "Short prompt",
                  "Medium prompt",
                  "Long prompt"
            }
      },
      { 'n', &n_optname,
            TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
            {
                  "Don't use line numbers",
                  "Use line numbers",
                  "Constantly display line numbers"
            }
      },
#if LOGFILE
      { 'o', &o_optname,
            STRING, 0, NULL, opt_o,
            { "log file: ", NULL, NULL }
      },
      { 'O', &O__optname,
            STRING, 0, NULL, opt__O,
            { "Log file: ", NULL, NULL }
      },
#endif
      { 'p', &p_optname,
            STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
            { NULL, NULL, NULL }
      },
      { 'P', &P__optname,
            STRING, 0, NULL, opt__P,
            { "prompt: ", NULL, NULL }
      },
      { 'q', &q_optname,
            TRIPLE, OPT_OFF, &quiet, NULL,
            {
                  "Ring the bell for errors AND at eof/bof",
                  "Ring the bell for errors but not at eof/bof",
                  "Never ring the bell"
            }
      },
      { 'r', &r_optname,
            TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
            {
                  "Display control characters as ^X",
                  "Display control characters directly",
                  "Display control characters directly, processing ANSI sequences"
            }
      },
      { 's', &s_optname,
            BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
            {
                  "Display all blank lines",
                  "Squeeze multiple blank lines",
                  NULL
            }
      },
      { 'S', &S__optname,
            BOOL|REPAINT, OPT_OFF, &chopline, NULL,
            {
                  "Fold long lines",
                  "Chop long lines",
                  NULL
            }
      },
#if TAGS
      { 't', &t_optname,
            STRING|NO_QUERY, 0, NULL, opt_t,
            { "tag: ", NULL, NULL }
      },
      { 'T', &T__optname,
            STRING, 0, NULL, opt__T,
            { "tags file: ", NULL, NULL }
      },
#endif
      { 'u', &u_optname,
            TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
            {
                  "Display underlined text in underline mode",
                  "Backspaces cause overstrike",
                  "Print backspace as ^H"
            }
      },
      { 'V', &V__optname,
            NOVAR, 0, NULL, opt__V,
            { NULL, NULL, NULL }
      },
      { 'w', &w_optname,
            TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
            {
                  "Don't highlight first unread line",
                  "Highlight first unread line after forward-screen",
                  "Highlight first unread line after any forward movement",
            }
      },
      { 'x', &x_optname,
            STRING|REPAINT, 0, NULL, opt_x,
            {
                  "Tab stops: ",
                  "0123456789,",
                  NULL
            }
      },
      { 'X', &X__optname,
            BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
            {
                  "Send init/deinit strings to terminal",
                  "Don't use init/deinit strings",
                  NULL
            }
      },
      { 'y', &y_optname,
            NUMBER, -1, &forw_scroll, NULL,
            {
                  "Forward scroll limit: ",
                  "Forward scroll limit is %d lines",
                  NULL
            }
      },
      { 'z', &z_optname,
            NUMBER, -1, &swindow, NULL,
            {
                  "Scroll window size: ",
                  "Scroll window size is %d lines",
                  NULL
            }
      },
      { '"', &quote_optname,
            STRING, 0, NULL, opt_quote,
            { "quotes: ", NULL, NULL }
      },
      { '~', &tilde_optname,
            BOOL|REPAINT, OPT_ON, &twiddle, NULL,
            {
                  "Don't show tildes after end of file",
                  "Show tildes after end of file",
                  NULL
            }
      },
      { '?', &query_optname,
            NOVAR, 0, NULL, opt_query,
            { NULL, NULL, NULL }
      },
      { '#', &pound_optname,
            NUMBER, 0, &shift_count, NULL,
            {
                  "Horizontal shift: ",
                  "Horizontal shift %d positions",
                  NULL
            }
      },
      { '.', &keypad_optname,
            BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
            {
                  "Use keypad mode",
                  "Don't use keypad mode",
                  NULL
            }
      },
      { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
};


/*
 * Initialize each option to its default value.
 */
      public void
init_option()
{
      register struct loption *o;
      char *p;

      p = lgetenv("LESS_IS_MORE");
      if (p != NULL && *p != '\0')
            less_is_more = 1;

      for (o = option;  o->oletter != '\0';  o++)
      {
            /*
             * Set each variable to its default.
             */
            if (o->ovar != NULL)
                  *(o->ovar) = o->odefault;
            if (o->otype & INIT_HANDLER)
                  (*(o->ofunc))(INIT, (char *) NULL);
      }
}

/*
 * Find an option in the option table, given its option letter.
 */
      public struct loption *
findopt(c)
      int c;
{
      register struct loption *o;

      for (o = option;  o->oletter != '\0';  o++)
      {
            if (o->oletter == c)
                  return (o);
            if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
                  return (o);
      }
      return (NULL);
}

/*
 *
 */
      static int
is_optchar(c)
      char c;
{
      if (ASCII_IS_UPPER(c))
            return 1;
      if (ASCII_IS_LOWER(c))
            return 1;
      if (c == '-')
            return 1;
      return 0;
}

/*
 * Find an option in the option table, given its option name.
 * p_optname is the (possibly partial) name to look for, and
 * is updated to point after the matched name.
 * p_oname if non-NULL is set to point to the full option name.
 */
      public struct loption *
findopt_name(p_optname, p_oname, p_err)
      char **p_optname;
      char **p_oname;
      int *p_err;
{
      char *optname = *p_optname;
      register struct loption *o;
      register struct optname *oname;
      register int len;
      int uppercase;
      struct loption *maxo = NULL;
      struct optname *maxoname = NULL;
      int maxlen = 0;
      int ambig = 0;
      int exact = 0;

      /*
       * Check all options.
       */
      for (o = option;  o->oletter != '\0';  o++)
      {
            /*
             * Check all names for this option.
             */
            for (oname = o->onames;  oname != NULL;  oname = oname->onext)
            {
                  /* 
                   * Try normal match first (uppercase == 0),
                   * then, then if it's a TRIPLE option,
                   * try uppercase match (uppercase == 1).
                   */
                  for (uppercase = 0;  uppercase <= 1;  uppercase++)
                  {
                        len = sprefix(optname, oname->oname, uppercase);
                        if (len <= 0 || is_optchar(optname[len]))
                        {
                              /*
                               * We didn't use all of the option name.
                               */
                              continue;
                        }
                        if (!exact && len == maxlen)
                              /*
                               * Already had a partial match,
                               * and now there's another one that
                               * matches the same length.
                               */
                              ambig = 1;
                        else if (len > maxlen)
                        {
                              /*
                               * Found a better match than
                               * the one we had.
                               */
                              maxo = o;
                              maxoname = oname;
                              maxlen = len;
                              ambig = 0;
                              exact = (len == (int)strlen(oname->oname));
                        }
                        if (!(o->otype & TRIPLE))
                              break;
                  }
            }
      }
      if (ambig)
      {
            /*
             * Name matched more than one option.
             */
            if (p_err != NULL)
                  *p_err = OPT_AMBIG;
            return (NULL);
      }
      *p_optname = optname + maxlen;
      if (p_oname != NULL)
            *p_oname = maxoname == NULL ? NULL : maxoname->oname;
      return (maxo);
}

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