Press n or j to go to the next uncovered block, b, p or k for the previous block.
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useState,
useEffect,
useRef,
useCallback,
KeyboardEvent,
ChangeEvent,
ReactNode,
ReactElement,
} from "react";
import TerminalInput from "./linetypes/TerminalInput";
import TerminalOutput from "./linetypes/TerminalOutput";
import "./style.css";
import {
IWindowButtonsProps,
WindowButtons,
} from "./ui-elements/WindowButtons";
// Constants
const SCROLL_INTO_VIEW_DELAY_MS = 500;
const CURSOR_POSITION_OFFSET_PX = 1;
/** Clamps a value between a minimum and maximum */
const clamp = (value: number, min: number, max: number) => {
Iif (value > max) return max;
if (value < min) return min;
return value;
};
export enum ColorMode {
Light,
Dark,
}
export interface Props {
name?: string;
prompt?: string;
height?: string;
colorMode?: ColorMode;
children?: ReactNode;
onInput?: ((input: string) => void) | null | undefined;
startingInputValue?: string;
passwordField?: boolean;
redBtnCallback?: () => void;
yellowBtnCallback?: () => void;
greenBtnCallback?: () => void;
TopButtonsPanel?: (props: IWindowButtonsProps) => ReactElement | null;
}
const Terminal = ({
name,
prompt,
height = "600px",
colorMode,
onInput,
children,
startingInputValue = "",
passwordField = false,
redBtnCallback,
yellowBtnCallback,
greenBtnCallback,
TopButtonsPanel = WindowButtons,
}: Props) => {
// local storage key
const terminalHistoryKey = name
? `terminal-history-${name}`
: "terminal-history";
// command history handling
const [historyIndex, setHistoryIndex] = useState(-1);
const [history, setHistory] = useState<string[]>([]);
const [currentLineInput, setCurrentLineInput] = useState("");
const [tmpInputValue, setTmpInputValue] = useState("");
const [cursorPos, setCursorPos] = useState(0);
const scrollIntoViewRef = useRef<HTMLDivElement>(null);
const updateCurrentLineInput = useCallback(
(event: ChangeEvent<HTMLInputElement>) => {
setCurrentLineInput(event.target.value);
},
[],
);
// Calculates the total width in pixels of the characters to the right of the cursor.
// Uses canvas measureText for better performance than DOM manipulation.
const calculateInputWidth = (
inputElement: HTMLInputElement,
chars: string,
) => {
const computedStyle = window.getComputedStyle(inputElement);
const canvas = document.createElement("canvas");
const context = canvas.getContext("2d");
Iif (context) {
context.font = `${computedStyle.fontSize} ${computedStyle.fontFamily}`;
const width = context.measureText(chars).width;
// Return the negative width, since the cursor position is to the left of the input suffix
return -width;
}
return 0;
};
// Change index ensuring it doesn't go out of bound
const changeHistoryIndex = (direction: 1 | -1) => {
setHistoryIndex((oldIndex) => {
Iif (history.length === 0) return -1;
// If we're not currently looking at history (oldIndex === -1) and user presses ArrowUp, jump to the last entry.
if (oldIndex === -1 && direction === -1) {
setTmpInputValue(currentLineInput);
return history.length - 1;
}
// If we're at the most recent history entry and user presses ArrowDown, go back to the temporary input value.
if (oldIndex === history.length - 1 && direction === 1) {
setCurrentLineInput(tmpInputValue);
setTmpInputValue("");
return -1;
}
// If oldIndex === -1 and direction === 1 (ArrowDown), keep -1 (nothing to go to).
Iif (oldIndex === -1 && direction === 1) {
return -1;
}
return clamp(oldIndex + direction, 0, history.length - 1);
});
};
const handleInputKeyDown = (event: KeyboardEvent<HTMLInputElement>) => {
Iif (!onInput) {
return;
}
if (event.key === "Enter") {
event.preventDefault();
onInput(currentLineInput);
setCursorPos(0);
// history update
const trimmedInput = currentLineInput.trim();
if (trimmedInput !== "") {
setHistory((previousHistory) =>
previousHistory[previousHistory.length - 1] === trimmedInput
? previousHistory
: [...previousHistory, trimmedInput],
);
}
setHistoryIndex(-1);
setCurrentLineInput("");
setTmpInputValue("");
setTimeout(
() =>
scrollIntoViewRef?.current?.scrollIntoView({
behavior: "auto",
block: "nearest",
}),
SCROLL_INTO_VIEW_DELAY_MS,
);
} else if (
["ArrowLeft", "ArrowRight", "ArrowDown", "ArrowUp", "Delete"].includes(
event.key,
)
) {
const inputElement = event.currentTarget;
let charsToRightOfCursor = "";
let cursorIndex =
currentLineInput.length - (inputElement.selectionStart || 0);
cursorIndex = clamp(cursorIndex, 0, currentLineInput.length);
Iif (event.key === "ArrowLeft") {
Iif (cursorIndex > currentLineInput.length - 1) cursorIndex--;
charsToRightOfCursor = currentLineInput.slice(
currentLineInput.length - 1 - cursorIndex,
);
} else Iif (event.key === "ArrowRight" || event.key === "Delete") {
charsToRightOfCursor = currentLineInput.slice(
currentLineInput.length - cursorIndex + 1,
);
} else if (event.key === "ArrowUp") {
event.preventDefault();
charsToRightOfCursor = currentLineInput.slice(currentLineInput.length);
changeHistoryIndex(-1);
} else if (event.key === "ArrowDown") {
event.preventDefault();
charsToRightOfCursor = currentLineInput.slice(currentLineInput.length);
changeHistoryIndex(1);
}
const inputWidth = calculateInputWidth(
inputElement,
charsToRightOfCursor,
);
setCursorPos(inputWidth);
}
};
useEffect(() => {
setCurrentLineInput(startingInputValue.trim());
}, [startingInputValue]);
// If history index changes or history length changes, we want to update the input value
useEffect(() => {
if (historyIndex >= 0 && historyIndex < history.length) {
setCurrentLineInput(history[historyIndex]);
}
}, [historyIndex, history.length]);
// history local storage persistency
useEffect(() => {
const storedHistory = localStorage.getItem(terminalHistoryKey);
if (storedHistory) {
try {
setHistory(JSON.parse(storedHistory));
} catch (e) {
console.error('Failed to parse terminal history from localStorage:', e);
}
}
}, [terminalHistoryKey]);
useEffect(() => {
localStorage.setItem(terminalHistoryKey, JSON.stringify(history));
}, [terminalHistoryKey, history]);
// We use a hidden input to capture terminal input; make sure the hidden input is focused when clicking anywhere on the terminal
useEffect(() => {
if (onInput == null) {
return;
}
// keep reference to listeners so we can perform cleanup
const elListeners: {
terminalEl: Element;
listener: EventListenerOrEventListenerObject;
}[] = [];
for (const terminalEl of document.getElementsByClassName(
"react-terminal-wrapper",
)) {
const listener = () =>
(
terminalEl?.querySelector(".terminal-hidden-input") as HTMLElement
)?.focus();
terminalEl?.addEventListener("click", listener);
elListeners.push({ terminalEl, listener });
}
return function cleanup() {
elListeners.forEach((elListener) => {
elListener.terminalEl.removeEventListener("click", elListener.listener);
});
};
}, [onInput]);
const classes = ["react-terminal-wrapper"];
if (colorMode === ColorMode.Light) {
classes.push("react-terminal-light");
}
return (
<div className={classes.join(" ")} data-terminal-name={name}>
<TopButtonsPanel
{...{ redBtnCallback, yellowBtnCallback, greenBtnCallback }}
/>
<div className="react-terminal" style={{ height }}>
{children}
{typeof onInput === "function" && (
<div
className="react-terminal-line react-terminal-input react-terminal-active-input"
data-terminal-prompt={prompt || "$"}
key="terminal-line-prompt"
>
{passwordField ? "*".repeat(currentLineInput.length) : currentLineInput}
<span
className="cursor"
style={{ left: `${cursorPos + CURSOR_POSITION_OFFSET_PX}px` }}
></span>
</div>
)}
<div ref={scrollIntoViewRef}></div>
</div>
<input
className="terminal-hidden-input"
placeholder="Terminal Hidden Input"
value={currentLineInput}
type={passwordField ? "password" : "text"}
autoFocus={onInput != null}
onChange={updateCurrentLineInput}
onKeyDown={handleInputKeyDown}
/>
</div>
);
};
export { TerminalInput, TerminalOutput };
export default Terminal;
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