stand/liblua/lpager.c

   1 /*-
   2  * Copyright (c) 2020 Kyle Evans <kevans@FreeBSD.org>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #include <lua.h>
  27 #include "lauxlib.h"
  28
  29 /* Open the pager.  No arguments, no return value. */
  30 static int
  31 lpager_open(lua_State *L)
  32 {
  33
  34         pager_open();
  35         return (0);
  36 }
  37
  38 /*
  39  * Output to the pager.  All arguments are interpreted as strings and passed to
  40  * pager_output().  No return value.
  41  */
  42 static int
  43 lpager_output(lua_State *L)
  44 {
  45         const char *outstr;
  46         int i;
  47
  48         for (i = 1; i <= lua_gettop(L); i++) {
  49                 outstr = luaL_tolstring(L,  i, NULL);
  50                 pager_output(outstr);
  51                 lua_pop(L, -1);
  52         }
  53
  54         return (0);
  55 }
  56
  57 /* Output to the pager from a file.  Takes a filename, no return value. */
  58 static int
  59 lpager_file(lua_State *L)
  60 {
  61
  62         return (pager_file(luaL_checkstring(L, 1)));
  63 }
  64
  65 static int
  66 lpager_close(lua_State *L)
  67 {
  68
  69         pager_close();
  70         return (0);
  71 }
  72
  73 static const struct luaL_Reg pagerlib[] = {
  74         { "open", lpager_open },
  75         { "output", lpager_output },
  76         { "file", lpager_file },
  77         { "close", lpager_close },
  78         { NULL, NULL },
  79 };
  80
  81 int
  82 luaopen_pager(lua_State *L)
  83 {
  84         luaL_newlib(L, pagerlib);
  85         return 1;
  86 }