import VTSequence from "@/components/VTSequence";

# Carriage Return (CR)

<VTSequence sequence="CR" />

Move the cursor to the leftmost column.

This sequence always unsets the pending wrap state.

If [origin mode (mode 6)](#TODO) is enabled, the cursor is set to the
[left margin](#TODO) of the scroll region and the operation is complete.

If origin mode is _not_ set and the cursor is on or to the right of the
left margin, the cursor is set to the left margin. If the cursor is to the left
of the left margin, the cursor is moved to the leftmost column in the terminal.

## Validation

### CR V-1: Pending Wrap is Unset

```bash
cols=$(tput cols)
printf "\033[${cols}G" # move to last column
printf "A" # set pending wrap state
printf "\r"
printf "X"
echo
```

```
|X________A|
|c_________|
```

### CR V-2: Left Margin

```bash
cols=$(tput cols)
printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "\033[?69h" # enable left/right margin mode
printf "\033[2;5s" # set left/right margin
printf "\033[4G"
printf "A"
printf "\r"
printf "X"
```

```
|_XcA______|
```

### CR V-3: Left of Left Margin

```bash
cols=$(tput cols)
printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "\033[?69h" # enable left/right margin mode
printf "\033[2;5s" # set left/right margin
printf "\033[4G"
printf "A"
printf "\033[1G"
printf "\r"
printf "X"
```

```
|Xc_A______|
```

### CR V-3: Left Margin with Origin Mode

```bash
cols=$(tput cols)
printf "\033[1;1H" # move to top-left
printf "\033[0J" # clear screen
printf "\033[?6h" # enable origin mode
printf "\033[?69h" # enable left/right margin mode
printf "\033[2;5s" # set left/right margin
printf "\033[4G"
printf "A"
printf "\033[1G"
printf "\r"
printf "X"
```

```
|_XcA______|
```
