121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
#include <map>
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#include <iostream>
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#include "globals.hh"
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#include "build.hh"
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#include "shared.hh"
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#include "eval.hh"
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#include "parser.hh"
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#include "nixexpr-ast.hh"
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#include "help.txt.hh"
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void printHelp()
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{
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cout << string((char *) helpText, sizeof helpText);
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}
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static Expr evalStdin(EvalState & state, bool parseOnly)
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{
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startNest(nest, lvlTalkative, format("evaluating standard input"));
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string s, s2;
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while (getline(cin, s2)) s += s2 + "\n";
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Expr e = parseExprFromString(state, s, absPath("."));
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return parseOnly ? e : evalExpr(state, e);
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}
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static void printDrvPaths(EvalState & state, Expr e)
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{
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ATermList es;
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/* !!! duplication w.r.t. parseDerivations in nix-env */
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if (matchAttrs(e, es)) {
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Expr a = queryAttr(e, "type");
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if (a && evalString(state, a) == "derivation") {
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a = queryAttr(e, "drvPath");
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if (a) {
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cout << format("%1%\n") % evalPath(state, a);
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return;
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}
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throw Error("bad derivation");
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} else {
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ATermMap drvMap;
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queryAllAttrs(e, drvMap);
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for (ATermIterator i(drvMap.keys()); i; ++i)
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printDrvPaths(state, evalExpr(state, drvMap.get(*i)));
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return;
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}
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}
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if (matchList(e, es)) {
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for (ATermIterator i(es); i; ++i)
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printDrvPaths(state, evalExpr(state, *i));
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return;
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}
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throw Error("expression does not evaluate to one or more derivations");
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}
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static void printResult(EvalState & state, Expr e, bool evalOnly)
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{
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if (evalOnly)
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cout << format("%1%\n") % e;
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else
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printDrvPaths(state, e);
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}
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void run(Strings args)
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{
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EvalState state;
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Strings files;
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bool readStdin = false;
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bool evalOnly = false;
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bool parseOnly = false;
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for (Strings::iterator it = args.begin();
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it != args.end(); )
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{
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string arg = *it++;
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if (arg == "-")
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readStdin = true;
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else if (arg == "--eval-only") {
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readOnlyMode = true;
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evalOnly = true;
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}
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else if (arg == "--parse-only") {
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readOnlyMode = true;
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parseOnly = evalOnly = true;
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}
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else if (arg[0] == '-')
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throw UsageError(format("unknown flag `%1%`") % arg);
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else
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files.push_back(arg);
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}
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openDB();
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if (readStdin) {
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Expr e = evalStdin(state, parseOnly);
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printResult(state, e, evalOnly);
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}
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for (Strings::iterator it = files.begin();
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it != files.end(); it++)
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{
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Expr e = evalFile(state, absPath(*it));
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/* !!! parseOnly ignored */
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printResult(state, e, evalOnly);
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}
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printEvalStats(state);
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}
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string programId = "nix-instantiate";
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