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* `nix-instantiate --print-args': print out the valid values for

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functions arguments that have a domain.
This commit is contained in:
Eelco Dolstra 2006-07-28 14:01:29 +00:00
parent ca2238cf81
commit c11839d7b2
3 changed files with 37 additions and 3 deletions
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14
src/nix-instantiate/main.cc
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@ -44,9 +44,17 @@ static void printResult(EvalState & state, Expr e,
ATerm body, pos;
if (matchFunction(e, formals, body, pos)) {
for (ATermIterator i(formals); i; ++i) {
Expr name; ATerm d1, d2;
if (!matchFormal(*i, name, d1, d2)) abort();
cout << format("%1%\n") % aterm2String(name);
Expr name; ValidValues valids; ATerm dummy;
if (!matchFormal(*i, name, valids, dummy)) abort();
cout << format("%1%: ") % aterm2String(name);
ATermList valids2;
if (matchValidValues(valids, valids2)) {
for (ATermIterator j(valids2); j; ++j) {
Expr e = evalExpr(state, *j);
cout << format("%1% ") % showValue(e);
}
}
cout << format("\n");
}
} else
printMsg(lvlError, "warning: expression does not evaluate to a function");