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/**
* Pure message composition — zero I/O.
*
* Combines text and file content into a single message string,
* and builds a ChatRequest from a parsed command.
*/
import type { ChatRequest, ReasoningEffort } from "@dispatch/transport-contract";
interface ComposeInput {
readonly text?: string;
readonly file?: string;
readonly fileContent?: string;
}
function basename(filePath: string): string {
const segments = filePath.split("/");
return segments[segments.length - 1] ?? filePath;
}
export function composeMessage(input: ComposeInput): string {
const { text, fileContent } = input;
const file = input.file;
if (text && file) {
return `${text}\n\nAttached file (${basename(file)}):\n${fileContent ?? ""}`;
}
if (file) {
return `Attached file (${basename(file)}):\n${fileContent ?? ""}`;
}
return text ?? "";
}
interface ChatCmd {
readonly modelName: string;
readonly text?: string | undefined;
readonly file?: string | undefined;
readonly cwd?: string | undefined;
readonly conversationId?: string | undefined;
readonly reasoningEffort?: ReasoningEffort | undefined;
readonly showReasoning: boolean;
}
interface BuildCtx {
readonly cwd: string;
readonly message: string;
}
export function buildChatRequest(cmd: ChatCmd, ctx: BuildCtx): ChatRequest {
return {
message: ctx.message,
model: cmd.modelName,
...(cmd.conversationId !== undefined && { conversationId: cmd.conversationId }),
...(cmd.cwd !== undefined ? { cwd: cmd.cwd } : { cwd: ctx.cwd }),
...(cmd.reasoningEffort !== undefined && { reasoningEffort: cmd.reasoningEffort }),
};
}
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