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feat(coding-agent): add prompt template argument defaults

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This commit is contained in:
Danila Poyarkov
2026-06-09 15:12:07 +03:00
parent c10fb95fd9
commit d81ac20920
4 changed files with 89 additions and 31 deletions
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59
packages/coding-agent/src/core/prompt-templates.ts
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@@ -59,46 +59,45 @@ export function parseCommandArgs(argsString: string): string[] {
* Supports:
* - $1, $2, ... for positional args
* - $@ and $ARGUMENTS for all args
* - ${N:-default} for positional arg N with default when missing/empty
* - ${@:N} for args from Nth onwards (bash-style slicing)
* - ${@:N:L} for L args starting from Nth
*
* Note: Replacement happens on the template string only. Argument values
* Note: Replacement happens on the template string only. Argument and default values
* containing patterns like $1, $@, or $ARGUMENTS are NOT recursively substituted.
*/
export function substituteArgs(content: string, args: string[]): string {
let result = content;
// Replace $1, $2, etc. with positional args FIRST (before wildcards)
// This prevents wildcard replacement values containing $<digit> patterns from being re-substituted
result = result.replace(/\$(\d+)/g, (_, num) => {
const index = parseInt(num, 10) - 1;
return args[index] ?? "";
});
// Replace ${@:start} or ${@:start:length} with sliced args (bash-style)
// Process BEFORE simple $@ to avoid conflicts
result = result.replace(/\$\{@:(\d+)(?::(\d+))?\}/g, (_, startStr, lengthStr) => {
let start = parseInt(startStr, 10) - 1; // Convert to 0-indexed (user provides 1-indexed)
// Treat 0 as 1 (bash convention: args start at 1)
if (start < 0) start = 0;
if (lengthStr) {
const length = parseInt(lengthStr, 10);
return args.slice(start, start + length).join(" ");
}
return args.slice(start).join(" ");
});
// Pre-compute all args joined (optimization)
const allArgs = args.join(" ");
// Replace $ARGUMENTS with all args joined (new syntax, aligns with Claude, Codex, OpenCode)
result = result.replace(/\$ARGUMENTS/g, allArgs);
return content.replace(
/\$\{(\d+):-([^}]*)\}|\$\{@:(\d+)(?::(\d+))?\}|\$(ARGUMENTS|@|\d+)/g,
(_match, defaultNum, defaultValue, sliceStart, sliceLength, simple) => {
if (defaultNum) {
const index = parseInt(defaultNum, 10) - 1;
const value = args[index];
return value ? value : defaultValue;
}
// Replace $@ with all args joined (existing syntax)
result = result.replace(/\$@/g, allArgs);
if (sliceStart) {
let start = parseInt(sliceStart, 10) - 1; // Convert to 0-indexed (user provides 1-indexed)
// Treat 0 as 1 (bash convention: args start at 1)
if (start < 0) start = 0;
return result;
if (sliceLength) {
const length = parseInt(sliceLength, 10);
return args.slice(start, start + length).join(" ");
}
return args.slice(start).join(" ");
}
if (simple === "ARGUMENTS" || simple === "@") {
return allArgs;
}
const index = parseInt(simple, 10) - 1;
return args[index] ?? "";
},
);
}
function loadTemplateFromFile(filePath: string, sourceInfo: SourceInfo): PromptTemplate | null {