76 lines
1.7 KiB
C++
76 lines
1.7 KiB
C++
#include "dotgraph.hh"
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#include "lix/libstore/store-api.hh"
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#include "lix/libutil/async.hh"
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#include "lix/libutil/result.hh"
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#include <iostream>
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using std::cout;
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namespace nix {
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static std::string dotQuote(std::string_view s)
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{
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return "\"" + std::string(s) + "\"";
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}
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static const std::string & nextColour()
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{
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static int n = 0;
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static std::vector<std::string> colours
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{ "black", "red", "green", "blue"
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, "magenta", "burlywood" };
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return colours[n++ % colours.size()];
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}
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static std::string makeEdge(std::string_view src, std::string_view dst)
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{
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return fmt("%1% -> %2% [color = %3%];\n",
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dotQuote(src), dotQuote(dst), dotQuote(nextColour()));
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}
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static std::string makeNode(std::string_view id, std::string_view label,
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std::string_view colour)
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{
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return fmt("%1% [label = %2%, shape = box, "
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"style = filled, fillcolor = %3%];\n",
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dotQuote(id), dotQuote(label), dotQuote(colour));
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}
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kj::Promise<Result<void>> printDotGraph(ref<Store> store, StorePathSet && roots)
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try {
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StorePathSet workList(std::move(roots));
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StorePathSet doneSet;
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cout << "digraph G {\n";
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while (!workList.empty()) {
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auto path = std::move(workList.extract(workList.begin()).value());
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if (!doneSet.insert(path).second) continue;
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cout << makeNode(std::string(path.to_string()), path.name(), "#ff0000");
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for (auto & p : TRY_AWAIT(store->queryPathInfo(path))->references) {
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if (p != path) {
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workList.insert(p);
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cout << makeEdge(std::string(p.to_string()), std::string(path.to_string()));
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}
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}
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}
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cout << "}\n";
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co_return result::success();
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} catch (...) {
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co_return result::current_exception();
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}
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}
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