contrib/nvi/ex/ex_usage.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "$Id: ex_usage.c,v 10.16 2011/12/21 19:26:48 zy Exp $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "../common/common.h"
  28 #include "../vi/vi.h"
  29
  30 /*
  31  * ex_help -- :help
  32  *      Display help message.
  33  *
  34  * PUBLIC: int ex_help __P((SCR *, EXCMD *));
  35  */
  36 int
  37 ex_help(SCR *sp, EXCMD *cmdp)
  38 {
  39         (void)ex_puts(sp,
  40             "To see the list of vi commands, enter \":viusage<CR>\"\n");
  41         (void)ex_puts(sp,
  42             "To see the list of ex commands, enter \":exusage<CR>\"\n");
  43         (void)ex_puts(sp,
  44             "For an ex command usage statement enter \":exusage [cmd]<CR>\"\n");
  45         (void)ex_puts(sp,
  46             "For a vi key usage statement enter \":viusage [key]<CR>\"\n");
  47         (void)ex_puts(sp, "To exit, enter \":q!\"\n");
  48         return (0);
  49 }
  50
  51 /*
  52  * ex_usage -- :exusage [cmd]
  53  *      Display ex usage strings.
  54  *
  55  * PUBLIC: int ex_usage __P((SCR *, EXCMD *));
  56  */
  57 int
  58 ex_usage(SCR *sp, EXCMD *cmdp)
  59 {
  60         ARGS *ap;
  61         EXCMDLIST const *cp;
  62         int newscreen;
  63         CHAR_T *name, *p, nb[MAXCMDNAMELEN + 5];
  64
  65         switch (cmdp->argc) {
  66         case 1:
  67                 ap = cmdp->argv[0];
  68                 if (ISUPPER(ap->bp[0])) {
  69                         newscreen = 1;
  70                         ap->bp[0] = TOLOWER(ap->bp[0]);
  71                 } else
  72                         newscreen = 0;
  73                 for (cp = cmds; cp->name != NULL &&
  74                     MEMCMP(ap->bp, cp->name, ap->len); ++cp);
  75                 if (cp->name == NULL ||
  76                     (newscreen && !F_ISSET(cp, E_NEWSCREEN))) {
  77                         if (newscreen)
  78                                 ap->bp[0] = TOUPPER(ap->bp[0]);
  79                         (void)ex_printf(sp, "The "WVS" command is unknown\n",
  80                             (int)ap->len, ap->bp);
  81                 } else {
  82                         (void)ex_printf(sp,
  83                             "Command: %s\n  Usage: %s\n", cp->help, cp->usage);
  84                         /*
  85                          * !!!
  86                          * The "visual" command has two modes, one from ex,
  87                          * one from the vi colon line.  Don't ask.
  88                          */
  89                         if (cp != &cmds[C_VISUAL_EX] &&
  90                             cp != &cmds[C_VISUAL_VI])
  91                                 break;
  92                         if (cp == &cmds[C_VISUAL_EX])
  93                                 cp = &cmds[C_VISUAL_VI];
  94                         else
  95                                 cp = &cmds[C_VISUAL_EX];
  96                         (void)ex_printf(sp,
  97                             "Command: %s\n  Usage: %s\n", cp->help, cp->usage);
  98                 }
  99                 break;
 100         case 0:
 101                 for (cp = cmds; cp->name != NULL && !INTERRUPTED(sp); ++cp) {
 102                         /*
 103                          * The ^D command has an unprintable name.
 104                          *
 105                          * XXX
 106                          * We display both capital and lower-case versions of
 107                          * the appropriate commands -- no need to add in extra
 108                          * room, they're all short names.
 109                          */
 110                         if (cp == &cmds[C_SCROLL])
 111                                 name = L("^D");
 112                         else if (F_ISSET(cp, E_NEWSCREEN)) {
 113                                 nb[0] = '[';
 114                                 nb[1] = TOUPPER(cp->name[0]);
 115                                 nb[2] = cp->name[0];
 116                                 nb[3] = ']';
 117                                 for (name = cp->name + 1,
 118                                     p = nb + 4; (*p++ = *name++) != '\0';);
 119                                 name = nb;
 120                         } else
 121                                 name = cp->name;
 122                         (void)ex_printf(sp,
 123                             WVS": %s\n", MAXCMDNAMELEN, name, cp->help);
 124                 }
 125                 break;
 126         default:
 127                 abort();
 128         }
 129         return (0);
 130 }
 131
 132 /*
 133  * ex_viusage -- :viusage [key]
 134  *      Display vi usage strings.
 135  *
 136  * PUBLIC: int ex_viusage __P((SCR *, EXCMD *));
 137  */
 138 int
 139 ex_viusage(SCR *sp, EXCMD *cmdp)
 140 {
 141         GS *gp;
 142         VIKEYS const *kp;
 143         int key;
 144
 145         gp = sp->gp;
 146         switch (cmdp->argc) {
 147         case 1:
 148                 if (cmdp->argv[0]->len != 1) {
 149                         ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
 150                         return (1);
 151                 }
 152                 key = cmdp->argv[0]->bp[0];
 153                 if (key > MAXVIKEY)
 154                         goto nokey;
 155
 156                 /* Special case: '[' and ']' commands. */
 157                 if ((key == '[' || key == ']') && cmdp->argv[0]->bp[1] != key)
 158                         goto nokey;
 159
 160                 /* Special case: ~ command. */
 161                 if (key == '~' && O_ISSET(sp, O_TILDEOP))
 162                         kp = &tmotion;
 163                 else
 164                         kp = &vikeys[key];
 165
 166                 if (kp->usage == NULL)
 167 nokey:                  (void)ex_printf(sp,
 168                             "The %s key has no current meaning\n",
 169                             KEY_NAME(sp, key));
 170                 else
 171                         (void)ex_printf(sp,
 172                             "  Key:%s%s\nUsage: %s\n",
 173                             isblank(*kp->help) ? "" : " ", kp->help, kp->usage);
 174                 break;
 175         case 0:
 176                 for (key = 0; key <= MAXVIKEY && !INTERRUPTED(sp); ++key) {
 177                         /* Special case: ~ command. */
 178                         if (key == '~' && O_ISSET(sp, O_TILDEOP))
 179                                 kp = &tmotion;
 180                         else
 181                                 kp = &vikeys[key];
 182                         if (kp->help != NULL)
 183                                 (void)ex_printf(sp, "%s\n", kp->help);
 184                 }
 185                 break;
 186         default:
 187                 abort();
 188         }
 189         return (0);
 190 }