523 lines
11 KiB
C
523 lines
11 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 1984-2000 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information about less, or for information on how to
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* contact the author, see the README file.
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*/
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/*
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* Prompting and other messages.
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* There are three flavors of prompts, SHORT, MEDIUM and LONG,
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* selected by the -m/-M options.
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* There is also the "equals message", printed by the = command.
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* A prompt is a message composed of various pieces, such as the
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* name of the file being viewed, the percentage into the file, etc.
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*/
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#include "less.h"
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#include "position.h"
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extern int pr_type;
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extern int hit_eof;
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extern int new_file;
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extern int sc_width;
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extern int so_s_width, so_e_width;
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extern int linenums;
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extern int hshift;
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extern int sc_height;
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extern int jump_sline;
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extern IFILE curr_ifile;
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#if EDITOR
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extern char *editor;
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extern char *editproto;
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#endif
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/*
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* Prototypes for the three flavors of prompts.
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* These strings are expanded by pr_expand().
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*/
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static constant char s_proto[] =
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"?n?f%f .?m(file %i of %m) ..?e(END) ?x- Next\\: %x..%t";
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static constant char m_proto[] =
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"?n?f%f .?m(file %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
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static constant char M_proto[] =
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"?f%f .?n?m(file %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t";
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static constant char e_proto[] =
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"?f%f .?m(file %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
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static constant char h_proto[] =
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"HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done";
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public char *prproto[3];
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public char constant *eqproto = e_proto;
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public char constant *hproto = h_proto;
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static char message[PROMPT_SIZE];
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static char *mp;
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/*
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* Initialize the prompt prototype strings.
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*/
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public void
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init_prompt()
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{
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prproto[0] = save(s_proto);
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prproto[1] = save(m_proto);
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prproto[2] = save(M_proto);
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eqproto = save(e_proto);
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hproto = save(h_proto);
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}
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/*
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* Append a string to the end of the message.
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*/
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static void
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ap_str(s)
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char *s;
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{
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int len;
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len = strlen(s);
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if (mp + len >= message + PROMPT_SIZE)
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len = message + PROMPT_SIZE - mp - 1;
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strncpy(mp, s, len);
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mp += len;
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*mp = '\0';
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}
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/*
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* Append a character to the end of the message.
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*/
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static void
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ap_char(c)
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char c;
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{
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char buf[2];
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buf[0] = c;
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buf[1] = '\0';
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ap_str(buf);
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}
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/*
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* Append a POSITION (as a decimal integer) to the end of the message.
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*/
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static void
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ap_pos(pos)
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POSITION pos;
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{
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char buf[MAX_PRINT_POSITION];
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sprintf(buf, PR_POSITION, (long long)pos);
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ap_str(buf);
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}
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/*
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* Append an integer to the end of the message.
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*/
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static void
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ap_int(n)
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int n;
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{
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char buf[MAX_PRINT_INT];
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sprintf(buf, "%d", n);
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ap_str(buf);
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}
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/*
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* Append a question mark to the end of the message.
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*/
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static void
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ap_quest()
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{
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ap_str("?");
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}
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/*
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* Return the "current" byte offset in the file.
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*/
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static POSITION
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curr_byte(where)
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int where;
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{
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POSITION pos;
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pos = position(where);
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while (pos == NULL_POSITION && where >= 0 && where < sc_height)
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pos = position(++where);
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if (pos == NULL_POSITION)
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pos = ch_length();
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return (pos);
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}
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/*
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* Return the value of a prototype conditional.
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* A prototype string may include conditionals which consist of a
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* question mark followed by a single letter.
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* Here we decode that letter and return the appropriate boolean value.
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*/
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static int
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cond(c, where)
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char c;
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int where;
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{
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POSITION len;
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switch (c)
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{
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case 'a': /* Anything in the message yet? */
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return (mp > message);
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case 'b': /* Current byte offset known? */
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return (curr_byte(where) != NULL_POSITION);
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case 'c':
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return (hshift != 0);
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case 'e': /* At end of file? */
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return (hit_eof);
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case 'f': /* Filename known? */
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return (strcmp(get_filename(curr_ifile), "-") != 0);
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case 'l': /* Line number known? */
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case 'd': /* Same as l */
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return (linenums);
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case 'L': /* Final line number known? */
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case 'D': /* Same as L */
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return (linenums && ch_length() != NULL_POSITION);
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case 'm': /* More than one file? */
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return (nifile() > 1);
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case 'n': /* First prompt in a new file? */
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return (new_file);
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case 'p': /* Percent into file (bytes) known? */
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return (curr_byte(where) != NULL_POSITION &&
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ch_length() > 0);
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case 'P': /* Percent into file (lines) known? */
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return (currline(where) != 0 &&
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(len = ch_length()) > 0 &&
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find_linenum(len) != 0);
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case 's': /* Size of file known? */
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case 'B':
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return (ch_length() != NULL_POSITION);
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case 'x': /* Is there a "next" file? */
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return (next_ifile(curr_ifile) != NULL_IFILE);
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}
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return (0);
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}
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/*
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* Decode a "percent" prototype character.
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* A prototype string may include various "percent" escapes;
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* that is, a percent sign followed by a single letter.
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* Here we decode that letter and take the appropriate action,
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* usually by appending something to the message being built.
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*/
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static void
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protochar(c, where, iseditproto)
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int c;
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int where;
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int iseditproto;
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{
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POSITION pos;
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POSITION len;
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int n;
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IFILE h;
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char *s;
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char *escs;
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switch (c)
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{
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case 'b': /* Current byte offset */
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pos = curr_byte(where);
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if (pos != NULL_POSITION)
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ap_pos(pos);
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else
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ap_quest();
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break;
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case 'c':
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ap_int(hshift);
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break;
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case 'd': /* Current page number */
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n = currline(where);
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if (n > 0 && sc_height > 1)
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ap_int(((n - 1) / (sc_height - 1)) + 1);
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else
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ap_quest();
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break;
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case 'D': /* Last page number */
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len = ch_length();
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if (len == NULL_POSITION || len == ch_zero() ||
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(n = find_linenum(len)) <= 0)
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ap_quest();
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else
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ap_int(((n - 1) / (sc_height - 1)) + 1);
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break;
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#if EDITOR
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case 'E': /* Editor name */
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ap_str(editor);
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break;
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#endif
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case 'f': /* File name */
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s = unquote_file(get_filename(curr_ifile));
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/*
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* If we are expanding editproto then we escape metachars.
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* This allows us to run the editor on files with funny names.
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*/
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if (iseditproto && (escs = esc_metachars(s)) != NULL)
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{
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free(s);
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s = escs;
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}
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ap_str(s);
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free(s);
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break;
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case 'i': /* Index into list of files */
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ap_int(get_index(curr_ifile));
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break;
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case 'l': /* Current line number */
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n = currline(where);
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if (n != 0)
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ap_int(n);
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else
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ap_quest();
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break;
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case 'L': /* Final line number */
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len = ch_length();
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if (len == NULL_POSITION || len == ch_zero() ||
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(n = find_linenum(len)) <= 0)
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ap_quest();
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else
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ap_int(n-1);
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break;
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case 'm': /* Number of files */
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ap_int(nifile());
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break;
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case 'p': /* Percent into file (bytes) */
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pos = curr_byte(where);
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len = ch_length();
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if (pos != NULL_POSITION && len > 0)
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ap_int(percentage(pos,len));
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else
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ap_quest();
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break;
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case 'P': /* Percent into file (lines) */
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pos = (POSITION) currline(where);
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if (pos == 0 ||
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(len = ch_length()) == NULL_POSITION || len == ch_zero() ||
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(n = find_linenum(len)) <= 0)
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ap_quest();
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else
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ap_int(percentage(pos, (POSITION)n));
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break;
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case 's': /* Size of file */
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case 'B':
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len = ch_length();
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if (len != NULL_POSITION)
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ap_pos(len);
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else
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ap_quest();
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break;
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case 't': /* Truncate trailing spaces in the message */
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while (mp > message && mp[-1] == ' ')
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mp--;
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break;
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case 'x': /* Name of next file */
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h = next_ifile(curr_ifile);
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if (h != NULL_IFILE)
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{
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s = unquote_file(get_filename(h));
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ap_str(s);
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free(s);
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} else
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ap_quest();
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break;
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}
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}
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/*
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* Skip a false conditional.
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* When a false condition is found (either a false IF or the ELSE part
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* of a true IF), this routine scans the prototype string to decide
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* where to resume parsing the string.
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* We must keep track of nested IFs and skip them properly.
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*/
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static char *
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skipcond(p)
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register char *p;
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{
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register int iflevel;
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/*
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* We came in here after processing a ? or :,
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* so we start nested one level deep.
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*/
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iflevel = 1;
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for (;;) switch (*++p)
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{
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case '?':
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/*
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* Start of a nested IF.
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*/
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iflevel++;
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break;
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case ':':
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/*
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* Else.
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* If this matches the IF we came in here with,
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* then we're done.
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*/
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if (iflevel == 1)
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return (p);
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break;
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case '.':
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/*
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* Endif.
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* If this matches the IF we came in here with,
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* then we're done.
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*/
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if (--iflevel == 0)
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return (p);
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break;
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case '\\':
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/*
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* Backslash escapes the next character.
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*/
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++p;
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break;
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case '\0':
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/*
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* Whoops. Hit end of string.
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* This is a malformed conditional, but just treat it
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* as if all active conditionals ends here.
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*/
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return (p-1);
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}
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/*NOTREACHED*/
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}
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/*
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* Decode a char that represents a position on the screen.
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*/
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static char *
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wherechar(p, wp)
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char *p;
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int *wp;
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{
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switch (*p)
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{
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case 'b': case 'd': case 'l': case 'p': case 'P':
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switch (*++p)
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{
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case 't': *wp = TOP; break;
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case 'm': *wp = MIDDLE; break;
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case 'b': *wp = BOTTOM; break;
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case 'B': *wp = BOTTOM_PLUS_ONE; break;
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case 'j': *wp = adjsline(jump_sline); break;
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default: *wp = TOP; p--; break;
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}
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}
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return (p);
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}
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/*
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* Construct a message based on a prototype string.
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*/
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public char *
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pr_expand(proto, maxwidth)
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char *proto;
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int maxwidth;
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{
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register char *p;
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register int c;
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int where;
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mp = message;
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if (*proto == '\0')
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return ("");
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for (p = proto; *p != '\0'; p++)
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{
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switch (*p)
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{
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default: /* Just put the character in the message */
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ap_char(*p);
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break;
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case '\\': /* Backslash escapes the next character */
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p++;
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ap_char(*p);
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break;
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case '?': /* Conditional (IF) */
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if ((c = *++p) == '\0')
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--p;
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else
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{
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where = 0;
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p = wherechar(p, &where);
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if (!cond(c, where))
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p = skipcond(p);
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}
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break;
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case ':': /* ELSE */
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p = skipcond(p);
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break;
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case '.': /* ENDIF */
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break;
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case '%': /* Percent escape */
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if ((c = *++p) == '\0')
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--p;
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else
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{
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where = 0;
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p = wherechar(p, &where);
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protochar(c, where,
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#if EDITOR
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(proto == editproto));
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#else
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0);
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#endif
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}
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break;
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}
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}
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new_file = 0;
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if (mp == message)
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return (NULL);
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if (maxwidth > 0 && mp >= message + maxwidth)
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{
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/*
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* Message is too long.
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* Return just the final portion of it.
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*/
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return (mp - maxwidth);
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}
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return (message);
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}
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/*
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* Return a message suitable for printing by the "=" command.
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*/
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public char *
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eq_message()
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{
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return (pr_expand(eqproto, 0));
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}
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/*
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* Return a prompt.
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* This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
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* If we can't come up with an appropriate prompt, return NULL
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* and the caller will prompt with a colon.
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*/
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public char *
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pr_string()
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{
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if (ch_getflags() & CH_HELPFILE)
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return (pr_expand(hproto, sc_width-so_s_width-so_e_width-2));
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return (pr_expand(prproto[pr_type], sc_width-so_s_width-so_e_width-2));
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}
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