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console.c
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console.c
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/*
* See Licensing and Copyright notice in naev.h
*/
/**
* @file console.c
*
* @brief Handles the Lua console.
*/
#include "console.h"
#include "naev.h"
#include <string.h>
#define lua_c
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "log.h"
#include "nlua.h"
#include "nlua_cli.h"
#include "font.h"
#include "toolkit.h"
#define CONSOLE_FONT_SIZE 10 /**< Size of the console font. */
#define BUTTON_WIDTH 50 /**< Button width. */
#define BUTTON_HEIGHT 20 /**< Button height. */
/*
* Global stuff.
*/
static lua_State *cli_state = NULL; /**< Lua CLI state. */
static glFont *cli_font = NULL; /**< CLI font to use. */
/*
* Buffers.
*/
#define BUF_LINES 256 /**< Number of lines in the buffer. */
#define LINE_LENGTH 80 /**< Length of lines in the buffer. */
static int cli_cursor = 0; /**< Current cursor position. */
static char cli_buffer[BUF_LINES][LINE_LENGTH]; /**< CLI buffer. */
static int cli_viewport = 0; /**< Current viewport. */
static int cli_history = 0; /**< Position in history. */
static int cli_width = 0; /**< Console width. */
static int cli_height = 0; /**< Console height. */
/*
* Input handling.
*/
static int cli_firstline = 1; /**< Is this the first line? */
/*
* CLI stuff.
*/
static int cli_print( lua_State *L );
static int cli_script( lua_State *L );
static const luaL_Reg cli_methods[] = {
{ "print", cli_print },
{ "script", cli_script },
{NULL, NULL}
}; /**< Console only functions. */
/*
* Prototypes.
*/
static int cli_keyhandler( unsigned int wid, SDLKey key, SDLMod mod );
static void cli_addMessage( const char *msg );
static void cli_render( double bx, double by, double w, double h );
/**
* @brief Replacement for the internal Lua print to print to console instead of terminal.
*/
static int cli_print( lua_State *L ) {
int n = lua_gettop(L); /* number of arguments */
int i;
char buf[LINE_LENGTH];
int p;
p = 0;
lua_getglobal(L, "tostring");
for (i=1; i<=n; i++) {
const char *s;
lua_pushvalue(L, -1); /* function to be called */
lua_pushvalue(L, i); /* value to print */
lua_call(L, 1, 1);
s = lua_tostring(L, -1); /* get result */
if (s == NULL)
return luaL_error(L, LUA_QL("tostring") " must return a string to "
LUA_QL("print"));
/* Add to console. */
p += snprintf( &buf[p], LINE_LENGTH-p, "%s%s", (i>1) ? " " : "", s );
if (p >= LINE_LENGTH) {
cli_addMessage(buf);
p = 0;
}
lua_pop(L, 1); /* pop result */
}
/* Add last line if needed. */
cli_addMessage(buf);
return 0;
}
/**
* @brief Would be like "dofile" from the base Lua lib.
*/
static int cli_script( lua_State *L )
{
const char *fname = luaL_optstring(L, 1, NULL);
int n = lua_gettop(L);
if (luaL_loadfile(L, fname) != 0) lua_error(L);
lua_call(L, 0, LUA_MULTRET);
return lua_gettop(L) - n;
}
/**
* @brief Adds a message to the buffer.
*
* @param msg Message to add.
*/
static void cli_addMessage( const char *msg )
{
int n;
if (msg != NULL)
strncpy( cli_buffer[cli_cursor], msg, LINE_LENGTH );
else
cli_buffer[cli_cursor][0] = '\0';
cli_cursor = (cli_cursor+1) % BUF_LINES;
cli_history = cli_cursor; /* History matches cursor. */
/* Move viewport if needed. */
n = (cli_cursor - cli_viewport) % BUF_LINES;
if ((n+1)*(cli_font->h+5) > cli_height-80-BUTTON_HEIGHT)
cli_viewport = (cli_viewport+1) % BUF_LINES;
}
/**
* @brief Render function for the custom widget.
*/
static void cli_render( double bx, double by, double w, double h )
{
int i, y;
glColour *c;
/* Draw the text. */
i = cli_viewport;
for (y=h-cli_font->h-5; y>0; y -= cli_font->h + 5) {
if (cli_buffer[i][0] == '>')
c = &cDConsole;
else if (strncmp(cli_buffer[i], "cli:", 4)==0)
c = &cRed;
else
c = &cBlack;
gl_printMaxRaw( cli_font, w,
bx + SCREEN_W/2., by + y + SCREEN_H/2.,
c, cli_buffer[i] );
i = (i + 1) % BUF_LINES;
}
}
/**
* @brief Key handler for the console window.
*/
static int cli_keyhandler( unsigned int wid, SDLKey key, SDLMod mod )
{
(void) mod;
int i;
switch (key) {
/* Go up in history. */
case SDLK_UP:
i = cli_history-1;
while (cli_buffer[i][0] != '\0') {
if (cli_buffer[i][0] == '>') {
window_setInput( wid, "inpInput", &cli_buffer[i][3] );
cli_history = i;
return 1;
}
i--;
}
return 1;
/* Go down in history. */
case SDLK_DOWN:
/* Clears buffer. */
if (cli_history >= cli_cursor) {
window_setInput( wid, "inpInput", NULL );
return 1;
}
/* Find next buffer. */
i = cli_history+1;
while (cli_buffer[i][0] != '\0') {
if (cli_buffer[i][0] == '>') {
window_setInput( wid, "inpInput", &cli_buffer[i][3] );
cli_history = i;
return 1;
}
i++;
}
window_setInput( wid, "inpInput", NULL );
return 1;
default:
break;
}
return 0;
}
/**
* @brief Initializes the CLI environment.
*/
int cli_init (void)
{
/* Already loaded. */
if (cli_state != NULL)
return 0;
/* Calculate size. */
cli_width = SCREEN_W - 100;
cli_height = SCREEN_H - 100;
/* Create the state. */
cli_state = nlua_newState();
nlua_loadBasic( cli_state );
nlua_loadStandard( cli_state, 0 );
nlua_loadCLI( cli_state );
luaL_register( cli_state, "_G", cli_methods );
lua_settop( cli_state, 0 );
/* Set the font. */
cli_font = malloc( sizeof(glFont) );
gl_fontInit( cli_font, "dat/mono.ttf", CONSOLE_FONT_SIZE );
/* Clear the buffer. */
memset( cli_buffer, 0, sizeof(cli_buffer) );
/* Put a friendly message at first. */
cli_addMessage( "Welcome to the Lua console!" );
cli_addMessage( "" );
return 0;
}
/**
* @brief Destroys the CLI environment.
*/
void cli_exit (void)
{
/* Destroy the state. */
if (cli_state != NULL) {
lua_close( cli_state );
cli_state = NULL;
}
/* Free the font. */
if (cli_font != NULL) {
gl_freeFont( cli_font );
free( cli_font );
cli_font = NULL;
}
}
/**
* @brief Handles the CLI input.
*
* @param wid Window recieving the input.
* @param unused Unused.
*/
static void cli_input( unsigned int wid, char *unused )
{
(void) unused;
int status;
char *str;
lua_State *L;
char buf[LINE_LENGTH];
/* Get the input. */
str = window_getInput( wid, "inpInput" );
/* Ignore useless stuff. */
if ((str == NULL) || (str[0] == '\0'))
return;
/* Put the message in the console. */
snprintf( buf, LINE_LENGTH, "%s %s",
cli_firstline ? "> " : ">>", str );
cli_addMessage( buf );
/* Set up state. */
L = cli_state;
/* Load the string. */
lua_pushstring( L, str );
/* Concat string if needed. */
if (!cli_firstline) {
lua_pushliteral(L, "\n"); /* add a new line... */
lua_insert(L, -2); /* ...between the two lines */
lua_concat(L, 3); /* join them */
}
status = luaL_loadbuffer( L, lua_tostring(L,-1), lua_strlen(L,-1), "=cli" );
/* String isn't proper Lua yet. */
if (status == LUA_ERRSYNTAX) {
size_t lmsg;
const char *msg = lua_tolstring(L, -1, &lmsg);
const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
if (strstr(msg, LUA_QL("<eof>")) == tp) {
/* Pop the loaded buffer. */
lua_pop(L, 1);
cli_firstline = 0;
}
else {
/* Real error, spew message and break. */
cli_addMessage( lua_tostring(L, -1) );
lua_settop(L, 0);
cli_firstline = 1;
}
}
/* Print results - all went well. */
else if (status == 0) {
if (lua_pcall(L, 0, LUA_MULTRET, 0))
cli_addMessage( lua_tostring(L, -1) );
/* Clear stack. */
lua_settop(L, 0);
cli_firstline = 1;
}
/* Clear the box now. */
window_setInput( wid, "inpInput", NULL );
}
/**
* @brief Opens the console.
*/
void cli_open (void)
{
unsigned int wid;
/* Lazy loading. */
if (cli_state == NULL)
if (cli_init())
return;
/* Must not be already open. */
if (window_exists( "Lua Console" ))
return;
/* Create the window. */
wid = window_create( "Lua Console", -1, -1, cli_width, cli_height );
/* Window settings. */
window_setAccept( wid, cli_input );
window_setCancel( wid, window_close );
window_handleKeys( wid, cli_keyhandler );
/* Input box. */
window_addInput( wid, 20, 20,
cli_width-60-BUTTON_WIDTH, BUTTON_HEIGHT,
"inpInput", LINE_LENGTH, 1 );
/* Buttons. */
window_addButton( wid, -20, 20, BUTTON_WIDTH, BUTTON_HEIGHT,
"btnClose", "Close", window_close );
/* Custom console widget. */
window_addCust( wid, 20, -40,
cli_width-40, cli_height-80-BUTTON_HEIGHT,
"cstConsole", 0, cli_render, NULL );
}