656 lines
17 KiB
C
656 lines
17 KiB
C
/*
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* Copyright (C) 1984-2019 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, see the README file.
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*/
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/*
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* The option table.
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*/
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#include "less.h"
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#include "option.h"
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/*
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* Variables controlled by command line options.
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*/
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public int quiet; /* Should we suppress the audible bell? */
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public int how_search; /* Where should forward searches start? */
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public int top_scroll; /* Repaint screen from top?
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(alternative is scroll from bottom) */
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public int pr_type; /* Type of prompt (short, medium, long) */
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public int bs_mode; /* How to process backspaces */
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public int know_dumb; /* Don't complain about dumb terminals */
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public int quit_at_eof; /* Quit after hitting end of file twice */
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public int quit_if_one_screen; /* Quit if EOF on first screen */
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public int squeeze; /* Squeeze multiple blank lines into one */
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public int tabstop; /* Tab settings */
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public int back_scroll; /* Repaint screen on backwards movement */
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public int forw_scroll; /* Repaint screen on forward movement */
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public int caseless; /* Do "caseless" searches */
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public int linenums; /* Use line numbers */
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public int autobuf; /* Automatically allocate buffers as needed */
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public int bufspace; /* Max buffer space per file (K) */
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public int ctldisp; /* Send control chars to screen untranslated */
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public int force_open; /* Open the file even if not regular file */
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public int swindow; /* Size of scrolling window */
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public int jump_sline; /* Screen line of "jump target" */
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public long jump_sline_fraction = -1;
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public long shift_count_fraction = -1;
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public int chopline; /* Truncate displayed lines at screen width */
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public int no_init; /* Disable sending ti/te termcap strings */
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public int no_keypad; /* Disable sending ks/ke termcap strings */
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public int twiddle; /* Show tildes after EOF */
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public int show_attn; /* Hilite first unread line */
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public int shift_count; /* Number of positions to shift horizontally */
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public int status_col; /* Display a status column */
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public int use_lessopen; /* Use the LESSOPEN filter */
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public int quit_on_intr; /* Quit on interrupt */
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public int follow_mode; /* F cmd Follows file desc or file name? */
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public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
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public int opt_use_backslash; /* Use backslash escaping in option parsing */
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public char rscroll_char; /* Char which marks chopped lines with -S */
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public int rscroll_attr; /* Attribute of rscroll_char */
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public int no_hist_dups; /* Remove dups from history list */
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public int mousecap; /* Allow mouse for scrolling */
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public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */
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public int perma_marks; /* Save marks in history file */
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#if HILITE_SEARCH
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public int hilite_search; /* Highlight matched search patterns? */
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#endif
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public int less_is_more = 0; /* Make compatible with POSIX more */
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/*
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* Long option names.
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*/
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static struct optname a_optname = { "search-skip-screen", NULL };
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static struct optname b_optname = { "buffers", NULL };
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static struct optname B__optname = { "auto-buffers", NULL };
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static struct optname c_optname = { "clear-screen", NULL };
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static struct optname d_optname = { "dumb", NULL };
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#if MSDOS_COMPILER
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static struct optname D__optname = { "color", NULL };
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#endif
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static struct optname e_optname = { "quit-at-eof", NULL };
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static struct optname f_optname = { "force", NULL };
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static struct optname F__optname = { "quit-if-one-screen", NULL };
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#if HILITE_SEARCH
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static struct optname g_optname = { "hilite-search", NULL };
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#endif
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static struct optname h_optname = { "max-back-scroll", NULL };
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static struct optname i_optname = { "ignore-case", NULL };
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static struct optname j_optname = { "jump-target", NULL };
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static struct optname J__optname = { "status-column", NULL };
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#if USERFILE
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static struct optname k_optname = { "lesskey-file", NULL };
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#endif
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static struct optname K__optname = { "quit-on-intr", NULL };
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static struct optname L__optname = { "no-lessopen", NULL };
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static struct optname m_optname = { "long-prompt", NULL };
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static struct optname n_optname = { "line-numbers", NULL };
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#if LOGFILE
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static struct optname o_optname = { "log-file", NULL };
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static struct optname O__optname = { "LOG-FILE", NULL };
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#endif
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static struct optname p_optname = { "pattern", NULL };
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static struct optname P__optname = { "prompt", NULL };
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static struct optname q2_optname = { "silent", NULL };
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static struct optname q_optname = { "quiet", &q2_optname };
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static struct optname r_optname = { "raw-control-chars", NULL };
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static struct optname s_optname = { "squeeze-blank-lines", NULL };
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static struct optname S__optname = { "chop-long-lines", NULL };
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#if TAGS
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static struct optname t_optname = { "tag", NULL };
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static struct optname T__optname = { "tag-file", NULL };
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#endif
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static struct optname u_optname = { "underline-special", NULL };
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static struct optname V__optname = { "version", NULL };
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static struct optname w_optname = { "hilite-unread", NULL };
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static struct optname x_optname = { "tabs", NULL };
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static struct optname X__optname = { "no-init", NULL };
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static struct optname y_optname = { "max-forw-scroll", NULL };
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static struct optname z_optname = { "window", NULL };
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static struct optname quote_optname = { "quotes", NULL };
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static struct optname tilde_optname = { "tilde", NULL };
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static struct optname query_optname = { "help", NULL };
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static struct optname pound_optname = { "shift", NULL };
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static struct optname keypad_optname = { "no-keypad", NULL };
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static struct optname oldbot_optname = { "old-bot", NULL };
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static struct optname follow_optname = { "follow-name", NULL };
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static struct optname use_backslash_optname = { "use-backslash", NULL };
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static struct optname rscroll_optname = { "rscroll", NULL };
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static struct optname nohistdups_optname = { "no-histdups", NULL };
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static struct optname mousecap_optname = { "mouse", NULL };
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static struct optname wheel_lines_optname = { "wheel-lines", NULL };
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static struct optname perma_marks_optname = { "save-marks", NULL };
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/*
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* Table of all options and their semantics.
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*
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* For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
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* the description of the option when set to 0, 1 or 2, respectively.
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* For NUMBER options, odesc[0] is the prompt to use when entering
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* a new value, and odesc[1] is the description, which should contain
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* one %d which is replaced by the value of the number.
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* For STRING options, odesc[0] is the prompt to use when entering
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* a new value, and odesc[1], if not NULL, is the set of characters
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* that are valid in the string.
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*/
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static struct loption option[] =
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{
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{ 'a', &a_optname,
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TRIPLE, OPT_ONPLUS, &how_search, NULL,
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{
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"Search includes displayed screen",
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"Search skips displayed screen",
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"Search includes all of displayed screen"
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}
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},
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{ 'b', &b_optname,
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NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
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{
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"Max buffer space per file (K): ",
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"Max buffer space per file: %dK",
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NULL
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}
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},
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{ 'B', &B__optname,
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BOOL, OPT_ON, &autobuf, NULL,
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{
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"Don't automatically allocate buffers",
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"Automatically allocate buffers when needed",
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NULL
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}
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},
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{ 'c', &c_optname,
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TRIPLE, OPT_OFF, &top_scroll, NULL,
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{
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"Repaint by scrolling from bottom of screen",
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"Repaint by painting from top of screen",
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"Repaint by painting from top of screen"
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}
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},
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{ 'd', &d_optname,
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BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
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{
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"Assume intelligent terminal",
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"Assume dumb terminal",
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NULL
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}
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},
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#if MSDOS_COMPILER
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{ 'D', &D__optname,
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STRING|REPAINT, 0, NULL, opt_D,
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{
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"color desc: ",
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"Dadknsu0123456789.",
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NULL
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}
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},
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#endif
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{ 'e', &e_optname,
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TRIPLE, OPT_OFF, &quit_at_eof, NULL,
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{
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"Don't quit at end-of-file",
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"Quit at end-of-file",
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"Quit immediately at end-of-file"
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}
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},
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{ 'f', &f_optname,
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BOOL, OPT_OFF, &force_open, NULL,
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{
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"Open only regular files",
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"Open even non-regular files",
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NULL
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}
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},
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{ 'F', &F__optname,
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BOOL, OPT_OFF, &quit_if_one_screen, NULL,
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{
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"Don't quit if end-of-file on first screen",
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"Quit if end-of-file on first screen",
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NULL
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}
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},
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#if HILITE_SEARCH
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{ 'g', &g_optname,
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TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
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{
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"Don't highlight search matches",
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"Highlight matches for previous search only",
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"Highlight all matches for previous search pattern",
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}
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},
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#endif
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{ 'h', &h_optname,
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NUMBER, -1, &back_scroll, NULL,
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{
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"Backwards scroll limit: ",
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"Backwards scroll limit is %d lines",
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NULL
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}
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},
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{ 'i', &i_optname,
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TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
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{
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"Case is significant in searches",
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"Ignore case in searches",
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"Ignore case in searches and in patterns"
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}
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},
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{ 'j', &j_optname,
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STRING, 0, NULL, opt_j,
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{
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"Target line: ",
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"0123456789.-",
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NULL
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}
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},
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{ 'J', &J__optname,
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BOOL|REPAINT, OPT_OFF, &status_col, NULL,
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{
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"Don't display a status column",
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"Display a status column",
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NULL
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}
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},
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#if USERFILE
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{ 'k', &k_optname,
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STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
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{ NULL, NULL, NULL }
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},
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#endif
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{ 'K', &K__optname,
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BOOL, OPT_OFF, &quit_on_intr, NULL,
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{
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"Interrupt (ctrl-C) returns to prompt",
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"Interrupt (ctrl-C) exits less",
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NULL
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}
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},
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{ 'L', &L__optname,
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BOOL, OPT_ON, &use_lessopen, NULL,
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{
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"Don't use the LESSOPEN filter",
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"Use the LESSOPEN filter",
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NULL
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}
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},
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{ 'm', &m_optname,
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TRIPLE, OPT_OFF, &pr_type, NULL,
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{
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"Short prompt",
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"Medium prompt",
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"Long prompt"
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}
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},
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{ 'n', &n_optname,
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TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
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{
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"Don't use line numbers",
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"Use line numbers",
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"Constantly display line numbers"
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}
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},
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#if LOGFILE
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{ 'o', &o_optname,
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STRING, 0, NULL, opt_o,
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{ "log file: ", NULL, NULL }
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},
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{ 'O', &O__optname,
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STRING, 0, NULL, opt__O,
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{ "Log file: ", NULL, NULL }
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},
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#endif
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{ 'p', &p_optname,
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STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
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{ NULL, NULL, NULL }
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},
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{ 'P', &P__optname,
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STRING, 0, NULL, opt__P,
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{ "prompt: ", NULL, NULL }
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},
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{ 'q', &q_optname,
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TRIPLE, OPT_OFF, &quiet, NULL,
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{
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"Ring the bell for errors AND at eof/bof",
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"Ring the bell for errors but not at eof/bof",
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"Never ring the bell"
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}
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},
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{ 'r', &r_optname,
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TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
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{
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"Display control characters as ^X",
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"Display control characters directly",
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"Display control characters directly, processing ANSI sequences"
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}
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},
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{ 's', &s_optname,
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BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
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{
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"Display all blank lines",
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"Squeeze multiple blank lines",
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NULL
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}
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},
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{ 'S', &S__optname,
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BOOL|REPAINT, OPT_OFF, &chopline, NULL,
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{
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"Fold long lines",
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"Chop long lines",
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NULL
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}
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},
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#if TAGS
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{ 't', &t_optname,
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STRING|NO_QUERY, 0, NULL, opt_t,
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{ "tag: ", NULL, NULL }
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},
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{ 'T', &T__optname,
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STRING, 0, NULL, opt__T,
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{ "tags file: ", NULL, NULL }
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},
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#endif
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{ 'u', &u_optname,
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TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
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{
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"Display underlined text in underline mode",
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"Backspaces cause overstrike",
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"Print backspace as ^H"
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}
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},
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{ 'V', &V__optname,
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NOVAR, 0, NULL, opt__V,
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{ NULL, NULL, NULL }
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},
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{ 'w', &w_optname,
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TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
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{
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"Don't highlight first unread line",
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"Highlight first unread line after forward-screen",
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"Highlight first unread line after any forward movement",
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}
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},
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{ 'x', &x_optname,
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STRING|REPAINT, 0, NULL, opt_x,
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{
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"Tab stops: ",
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"0123456789,",
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NULL
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}
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},
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{ 'X', &X__optname,
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BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
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{
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"Send init/deinit strings to terminal",
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"Don't use init/deinit strings",
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NULL
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}
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},
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{ 'y', &y_optname,
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NUMBER, -1, &forw_scroll, NULL,
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{
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"Forward scroll limit: ",
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"Forward scroll limit is %d lines",
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NULL
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}
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},
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{ 'z', &z_optname,
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NUMBER, -1, &swindow, NULL,
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{
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"Scroll window size: ",
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"Scroll window size is %d lines",
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NULL
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}
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},
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{ '"', "e_optname,
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STRING, 0, NULL, opt_quote,
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{ "quotes: ", NULL, NULL }
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},
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{ '~', &tilde_optname,
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BOOL|REPAINT, OPT_ON, &twiddle, NULL,
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{
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"Don't show tildes after end of file",
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"Show tildes after end of file",
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NULL
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}
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},
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{ '?', &query_optname,
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NOVAR, 0, NULL, opt_query,
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{ NULL, NULL, NULL }
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},
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{ '#', £_optname,
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STRING, 0, NULL, opt_shift,
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{
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"Horizontal shift: ",
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"0123456789.",
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NULL
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}
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},
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{ OLETTER_NONE, &keypad_optname,
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BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
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{
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"Use keypad mode",
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"Don't use keypad mode",
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NULL
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}
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},
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{ OLETTER_NONE, &oldbot_optname,
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BOOL, OPT_OFF, &oldbot, NULL,
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{
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"Use new bottom of screen behavior",
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"Use old bottom of screen behavior",
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NULL
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}
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},
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{ OLETTER_NONE, &follow_optname,
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BOOL, FOLLOW_DESC, &follow_mode, NULL,
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{
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"F command follows file descriptor",
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"F command follows file name",
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NULL
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}
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},
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{ OLETTER_NONE, &use_backslash_optname,
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BOOL, OPT_OFF, &opt_use_backslash, NULL,
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{
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"Use backslash escaping in command line parameters",
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"Don't use backslash escaping in command line parameters",
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NULL
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}
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},
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{ OLETTER_NONE, &rscroll_optname,
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STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll,
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{ "right scroll character: ", NULL, NULL }
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},
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{ OLETTER_NONE, &nohistdups_optname,
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BOOL, OPT_OFF, &no_hist_dups, NULL,
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{
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"Allow duplicates in history list",
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"Remove duplicates from history list",
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NULL
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}
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},
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{ OLETTER_NONE, &mousecap_optname,
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TRIPLE, OPT_OFF, &mousecap, opt_mousecap,
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{
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"Ignore mouse input",
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"Use the mouse for scrolling",
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"Use the mouse for scrolling (reverse)"
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}
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},
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{ OLETTER_NONE, &wheel_lines_optname,
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NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines,
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{
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"Lines to scroll on mouse wheel: ",
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"Scroll %d line(s) on mouse wheel",
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NULL
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}
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},
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{ OLETTER_NONE, &perma_marks_optname,
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BOOL, OPT_OFF, &perma_marks, NULL,
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{
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"Don't save marks in history file",
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"Save marks in history file",
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NULL
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}
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},
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{ '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
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};
|
|
|
|
|
|
/*
|
|
* Initialize each option to its default value.
|
|
*/
|
|
public void
|
|
init_option(VOID_PARAM)
|
|
{
|
|
struct loption *o;
|
|
char *p;
|
|
|
|
p = lgetenv("LESS_IS_MORE");
|
|
if (!isnullenv(p))
|
|
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;
|
|
{
|
|
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;
|
|
struct loption *o;
|
|
struct optname *oname;
|
|
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);
|
|
}
|