export type ComposerTriggerKind = "path" | "slash-command" | "skill";export type ComposerSlashCommand = "model" | "plan" | "default"; export interface ComposerTrigger { kind: ComposerTriggerKind; query: string; rangeStart: number; rangeEnd: number;} function clampCursor(text: string, cursor: number): number { if (!Number.isFinite(cursor)) return text.length; return Math.max(0, Math.min(text.length, Math.floor(cursor)));} function isWhitespace(char: string): boolean { return char === " " || char === "\n" || char === "\t" || char === "\r";} /** * Detect an active trigger (@path, $skill, /command) at the cursor position. * * Accepts an optional `isWhitespaceChar` override so callers with inline * placeholder characters (e.g. terminal context chips on web) can treat * those as token boundaries. */export function detectComposerTrigger( text: string, cursorInput: number, isWhitespaceChar?: (char: string) => boolean,): ComposerTrigger | null { const cursor = clampCursor(text, cursorInput); const lineStart = text.lastIndexOf("\n", Math.max(0, cursor - 1)) + 1; const linePrefix = text.slice(lineStart, cursor); if (linePrefix.startsWith("/")) { const commandMatch = /^\/(\S*)$/.exec(linePrefix); if (commandMatch) { const commandQuery = commandMatch[1] ?? ""; return { kind: "slash-command", query: commandQuery, rangeStart: lineStart, rangeEnd: cursor, }; } } const wsCheck = isWhitespaceChar ?? isWhitespace; let tokenIdx = cursor - 1; while (tokenIdx >= 0 && !wsCheck(text[tokenIdx] ?? "")) { tokenIdx -= 1; } const tokenStart = tokenIdx + 1; const token = text.slice(tokenStart, cursor); if (token.startsWith("$")) { return { kind: "skill", query: token.slice(1), rangeStart: tokenStart, rangeEnd: cursor, }; } if (!token.startsWith("@")) { return null; } return { kind: "path", query: token.slice(1), rangeStart: tokenStart, rangeEnd: cursor, };} export function parseStandaloneComposerSlashCommand( text: string,): Exclude<ComposerSlashCommand, "model"> | null { const match = /^\/(plan|default)\s*$/i.exec(text.trim()); if (!match) { return null; } const command = match[1]?.toLowerCase(); if (command === "plan") return "plan"; return "default";} export function replaceTextRange( text: string, rangeStart: number, rangeEnd: number, replacement: string,): { text: string; cursor: number } { const safeStart = Math.max(0, Math.min(text.length, rangeStart)); const safeEnd = Math.max(safeStart, Math.min(text.length, rangeEnd)); const nextText = `${text.slice(0, safeStart)}${replacement}${text.slice(safeEnd)}`; return { text: nextText, cursor: safeStart + replacement.length };}
export type ComposerTriggerKind = "path" | "slash-command" | "skill";
export type ComposerSlashCommand = "model" | "plan" | "default";
export interface ComposerTrigger {
kind: ComposerTriggerKind;
query: string;
rangeStart: number;
rangeEnd: number;
}
function clampCursor(text: string, cursor: number): number {
if (!Number.isFinite(cursor)) return text.length;
return Math.max(0, Math.min(text.length, Math.floor(cursor)));
}
function isWhitespace(char: string): boolean {
return char === " " || char === "\n" || char === "\t" || char === "\r";
}
/**
* Detect an active trigger (@path, $skill, /command) at the cursor position.
*
* Accepts an optional `isWhitespaceChar` override so callers with inline
* placeholder characters (e.g. terminal context chips on web) can treat
* those as token boundaries.
*/
export function detectComposerTrigger(
text: string,
cursorInput: number,
isWhitespaceChar?: (char: string) => boolean,
): ComposerTrigger | null {
const cursor = clampCursor(text, cursorInput);
const lineStart = text.lastIndexOf("\n", Math.max(0, cursor - 1)) + 1;
const linePrefix = text.slice(lineStart, cursor);
if (linePrefix.startsWith("/")) {
const commandMatch = /^\/(\S*)$/.exec(linePrefix);
if (commandMatch) {
const commandQuery = commandMatch[1] ?? "";
return {
kind: "slash-command",
query: commandQuery,
rangeStart: lineStart,
rangeEnd: cursor,
};
}
}
const wsCheck = isWhitespaceChar ?? isWhitespace;
let tokenIdx = cursor - 1;
while (tokenIdx >= 0 && !wsCheck(text[tokenIdx] ?? "")) {
tokenIdx -= 1;
}
const tokenStart = tokenIdx + 1;
const token = text.slice(tokenStart, cursor);
if (token.startsWith("$")) {
return {
kind: "skill",
query: token.slice(1),
rangeStart: tokenStart,
rangeEnd: cursor,
};
}
if (!token.startsWith("@")) {
return null;
}
return {
kind: "path",
query: token.slice(1),
rangeStart: tokenStart,
rangeEnd: cursor,
};
}
export function parseStandaloneComposerSlashCommand(
text: string,
): Exclude<ComposerSlashCommand, "model"> | null {
const match = /^\/(plan|default)\s*$/i.exec(text.trim());
if (!match) {
return null;
}
const command = match[1]?.toLowerCase();
if (command === "plan") return "plan";
return "default";
}
export function replaceTextRange(
text: string,
rangeStart: number,
rangeEnd: number,
replacement: string,
): { text: string; cursor: number } {
const safeStart = Math.max(0, Math.min(text.length, rangeStart));
const safeEnd = Math.max(safeStart, Math.min(text.length, rangeEnd));
const nextText = `${text.slice(0, safeStart)}${replacement}${text.slice(safeEnd)}`;
return { text: nextText, cursor: safeStart + replacement.length };
}