forked from lix-project/lix
59b94ee18a
print a nice backtrace of the stack, rather than vomiting a gigantic
(and useless) aterm on the screen. Example:
error: while evaluating file `.../pkgs/system/test.nix':
while evaluating attribute `subversion' at `.../pkgs/system/all-packages-generic.nix', line 533:
while evaluating function at `.../pkgs/applications/version-management/subversion/default.nix', line 1:
assertion failed at `.../pkgs/applications/version-management/subversion/default.nix', line 13
Since the Nix expression language is lazy, the trace may be
misleading. The purpose is to provide a hint as to the location of
the problem.
92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
#include <map>
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#include <iostream>
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#include "globals.hh"
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#include "normalise.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 "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)
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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 evalExpr(state, e);
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}
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static void printNixExpr(EvalState & state, Expr e)
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{
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ATMatcher m;
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ATermList es;
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if (atMatch(m, e) >> "Attrs" >> 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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}
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}
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if (atMatch(m, e) >> "List" >> es) {
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for (ATermIterator i(es); i; ++i)
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printNixExpr(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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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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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[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);
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printNixExpr(state, e);
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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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printNixExpr(state, e);
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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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