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#include <map>
#include <iostream>
#include "globals.hh"
#include "normalise.hh"
#include "shared.hh"
#include "eval.hh"
#include "parser.hh"
#include "help.txt.hh"
void printHelp()
{
cout << string((char *) helpText, sizeof helpText);
}
static Expr evalStdin(EvalState & state)
{
startNest(nest, lvlTalkative, format("evaluating standard input"));
string s, s2;
while (getline(cin, s2)) s += s2 + "\n";
Expr e = parseExprFromString(state, s, absPath("."));
return evalExpr(state, e);
}
static void printNixExpr(EvalState & state, Expr e)
{
ATMatcher m;
ATermList es;
if (atMatch(m, e) >> "Attrs" >> es) {
Expr a = queryAttr(e, "type");
if (a && evalString(state, a) == "derivation") {
a = queryAttr(e, "drvPath");
if (a) {
cout << format("%1%\n") % evalPath(state, a);
return;
}
}
}
if (atMatch(m, e) >> "List" >> es) {
for (ATermIterator i(es); i; ++i)
printNixExpr(state, evalExpr(state, *i));
return;
}
throw Error("expression does not evaluate to one or more derivations");
}
void run(Strings args)
{
EvalState state;
Strings files;
bool readStdin = false;
for (Strings::iterator it = args.begin();
it != args.end(); )
{
string arg = *it++;
if (arg == "-")
readStdin = true;
else if (arg[0] == '-')
throw UsageError(format("unknown flag `%1%`") % arg);
else
files.push_back(arg);
}
openDB();
if (readStdin) {
Expr e = evalStdin(state);
printNixExpr(state, e);
}
for (Strings::iterator it = files.begin();
it != files.end(); it++)
{
Expr e = evalFile(state, absPath(*it));
printNixExpr(state, e);
}
printEvalStats(state);
}
string programId = "nix-instantiate";
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