TegraScript/README.md

# TegraScript
The scripting language of TegraExplorer

## Functions

Function | Args | Description | Output
|:-|:-|:-|:-|
`printf(string arg1)` | arg1: Text to print to the screen | writes text to the screen | returns 0
`printInt(int arg1)` | arg1: Int variable to print | Displays an int variable to the screen in the format `@var: (number)` | returns 0
`setPrintPos(int arg1, int arg2)` | arg1: sets cursor position x, arg2: sets cursor position y | sets cursor to a position on the screen. Max X is 42, max Y is 78 | returns 0
`setColor(string arg1)` | arg1: color string. Valid args: `RED`, `ORANGE`, `YELLOW`, `GREEN`, `BLUE`, `VIOLET`, `WHITE` | Changes the color of the text printed | returns 0
`if(int arg1)` | arg1: checks if interger is true or false (not 0 or 0) | Part of flow control. Runs code inside {} | returns 0
`goto(jmp arg1)` | arg1: marker written as `?JUMP` | jumps to the marker specified | returns 0
`math(int arg1, string arg2, int arg3)` | arg1 "operator arg2" arg3. Valid operators (arg2s): `"+"`, `"-"`, `"*"`, `"/"` | Does a math operation and returns the result | returns the result of the math operation
`check(int arg1, string arg2, int arg3)` | arg1 "operator arg2" arg3. Valid operators (arg2s): `"=="`, `"!="`, `">="`, `"<="`, `">"`, `"<"` | Does a check and returns the result. result is either 0 or 1 | returns 0 or 1
`invert(int arg1)` | - | makes non 0 integers a 0, and vise versa | returns 0 or 1
`setInt(int arg1)` | - | returns arg1, for setting of variables | returns arg1
`setString(string in, $svar out)` | $svar is a string variable, written as `$var` | copies in to out | returns 0
`setStringIndex(int in, $svar out)` | looks up earlier defined strings in order. User defined strings start at index 1. $svar is a string variable | Copies string table index to out | returns 0
`combineStrings(string s1, string s2, $svar out)` | $svar is a string variable | combines s1 and s2 (as s1s2) and copies it into out | returns 0
`compareStrings(string s1, string s2)` | - | compares s1 to s2. If they are the same, the function returns 1, else 0 | returns 0 or 1
`pause()` | - | pauses the script until it recieves user input. result will be copied into `@BTN_POWER`, `@BTN_VOL+` and `@BTN_VOL-` | returns >0
`wait(int arg1)` | arg1: amount that it waits | waits for the given amount of time, then continues running the script | returns 0
`exit()` | - | exits the script | -
`fs_exists(string path)` | path: full path to file | check if a file exists. 1 if it exists, 0 if it doesn't | returns 0 or 1
`fs_move(string src, string dst)` | src/dst: full path to file | move file from src to dst | returns >= 0
`fs_mkdir(string path)` | path: full path to file | creates a directory at the given path (note: returns 8 if the folder already exists | returns >= 0
`fs_del(string path)` | path: full path to file | deletes a file (or empty directory) | returns >= 0
`fs_delRecursive(string path)` | path: full path to folder | deletes a folder with all subitems | returns >= 0
`fs_copy(string src, string dst)` | src/dst: full path to file | copies a file from src to dst | returns >= 0
`fs_copyRecursive(string src, string dst)` | src/dst: full path to file | copies a folder with subitems from src to dst (note that dst is the parent folder, src will be copied to dst/src) | returns >= 0
`fs_openDir(string path)` | path: full path to folder | opens a directory for use with `fs_readDir()` and sets `@ISDIRVALID` to 1 | returns >= 0
`fs_closeDir()` | - | closes current open directory and sets `@ISDIRVALID` to 0 | returns 0
`fs_readDir()` | - | reads entry out of dir. Atomatically calls `fs_closeDir()` if the end of the dir is reached. Saves result to `$FILENAME` and `@ISDIR` | returns 0
`mmc_connect(string mmctype)` | mmctype: either `SYSMMC` or `EMUMMC` | connects SYSMMC or EMUMMC to the system. Specify partition with `mmc_mount()` | returns 0
`mmc_mount(string partition)` | partition: either `SYSTEM` or `USER` | mounts partition in previously connected mmc | returns >= 0

## Variables

TegraScript has 3 kinds of variables, @ints, $strings, and ?marks.
- You can define @ints by writing `@variable = setInt(0);` (or any function for that matter).
- You can define $strings with the use of `setString();`, `setStringIndex();` and `combineStrings();`.
- You can define ?marks by using them as a command, so just `?variable;` will work.

You can use these variables in place of int, string or jmp inputs respectively, so for example `@b = setInt(@a)` or `setString($a, $b)`

### Built in variables
There are some built in variables:
- `@EMUMMC`: 1 if an emummc was found, 0 if no emummc was found
- `@RESULT`: result of the last ran function
- `@BTN_POWER`, `@BTN_VOL+`, `@BTN_VOL-`: result of the `pause()` function, represents which button got pressed during the `pause()` function
- `$CURRENTPATH`: Represents the current path

(if `fs_readdir()` got ran)
- `@ISDIRVALID`: Is the open directory valid
- `$FILENAME`: Represents the current filename
- `@ISDIR`: 1 if the last read file is a DIR, otherwise 0

## Flow control

You can use `if()`, `goto()`, `check()` and `math()` functions to control the flow of your program. Example:
```
@i = setInt(0);
?LOOP;
@check = check(@i, "<=", 10);
if (@check){
    @i = math(@i, "+", 1);
    printInt(@i);
    goto (?LOOP);
}
```
This will print numbers 0 to 10 as `@i: x`

Another example:

```
printf("Press a button");

pause();

if (@BTN_VOL+){
    printf("Vol+ has been pressed");
}
if (@BTN_VOL-){
    printf("Vol- has been pressed");
}
if (@BTN_POWER){
    printf("Power has been pressed");
}

```