151 lines
3.5 KiB
C++
151 lines
3.5 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 "expr.hh"
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#include "eval.hh"
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#if 0
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static Path searchPath(const Paths & searchDirs, const Path & relPath)
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{
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if (string(relPath, 0, 1) == "/") return relPath;
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for (Paths::const_iterator i = searchDirs.begin();
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i != searchDirs.end(); i++)
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{
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Path path = *i + "/" + relPath;
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if (pathExists(path)) return path;
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}
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throw Error(
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format("path `%1%' not found in any of the search directories")
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% relPath);
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}
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#endif
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#if 0
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static Expr evalExpr2(EvalState & state, Expr e)
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{
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/* Ad-hoc function for string matching. */
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if (ATmatch(e, "HasSubstr(<term>, <term>)", &e1, &e2)) {
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e1 = evalExpr(state, e1);
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e2 = evalExpr(state, e2);
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char * s1, * s2;
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if (!ATmatch(e1, "<str>", &s1))
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throw badTerm("expecting a string", e1);
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if (!ATmatch(e2, "<str>", &s2))
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throw badTerm("expecting a string", e2);
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return
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string(s1).find(string(s2)) != string::npos ?
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ATmake("True") : ATmake("False");
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}
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/* BaseName primitive function. */
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if (ATmatch(e, "BaseName(<term>)", &e1)) {
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e1 = evalExpr(state, e1);
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if (!ATmatch(e1, "<str>", &s1))
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throw badTerm("string expected", e1);
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return ATmake("<str>", baseNameOf(s1).c_str());
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}
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}
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#endif
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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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Expr e = ATreadFromFile(stdin);
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if (!e)
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throw Error(format("unable to read a term from stdin"));
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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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ATermList es;
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if (ATmatch(e, "Attrs([<list>])", &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(e, "[<list>]", &es)) {
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while (!ATisEmpty(es)) {
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printNixExpr(state, evalExpr(state, ATgetFirst(es)));
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es = ATgetNext(es);
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}
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return;
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}
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throw badTerm("top level does not evaluate to one or more Nix expressions", 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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#if 0
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state.searchDirs.push_back(".");
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state.searchDirs.push_back(nixDataDir + "/fix");
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#endif
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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 0
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if (arg == "--includedir" || arg == "-I") {
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if (it == args.end())
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throw UsageError(format("argument required in `%1%'") % arg);
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state.searchDirs.push_back(*it++);
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}
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else
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#endif
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if (arg == "--verbose" || arg == "-v")
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verbosity = (Verbosity) ((int) verbosity + 1);
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else 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 = "fix";
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