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stand: Add lua binding loader.has_command

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Give scripts the ability to determine if the currently running loader
has provided a command.

Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D36365
This commit is contained in:
Warner Losh 2022-09-01 11:06:19 -06:00
parent a5948d40ad
commit 29fc4075e6
1 changed files with 17 additions and 2 deletions
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19
stand/liblua/lutils.c
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@ -63,6 +63,21 @@ lua_command(lua_State *L)
return 1;
}
static int
lua_has_command(lua_State *L)
{
const char *cmd;
if (lua_gettop(L) != 1) {
lua_pushnil(L);
return 1;
}
cmd = luaL_checkstring(L, 1);
lua_pushinteger(L, interp_has_builtin_cmd(cmd));
return 1;
}
static int
lua_perform(lua_State *L)
{
@ -539,9 +554,9 @@ static const struct luaL_Reg loaderlib[] = {
REG_SIMPLE(interpret),
REG_SIMPLE(parse),
REG_SIMPLE(getenv),
REG_SIMPLE(has_command),
REG_SIMPLE(perform),
/* Also registered as the global 'printc' */
REG_SIMPLE(printc),
REG_SIMPLE(printc), /* Also registered as the global 'printc' */
REG_SIMPLE(setenv),
REG_SIMPLE(time),
REG_SIMPLE(unsetenv),