mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-27 16:16:16 +02:00
bbe97dff8b
Most functions now take a StorePath argument rather than a Path (which is just an alias for std::string). The StorePath constructor ensures that the path is syntactically correct (i.e. it looks like <store-dir>/<base32-hash>-<name>). Similarly, functions like buildPaths() now take a StorePathWithOutputs, rather than abusing Path by adding a '!<outputs>' suffix. Note that the StorePath type is implemented in Rust. This involves some hackery to allow Rust values to be used directly in C++, via a helper type whose destructor calls the Rust type's drop() function. The main issue is the dynamic nature of C++ move semantics: after we have moved a Rust value, we should not call the drop function on the original value. So when we move a value, we set the original value to bitwise zero, and the destructor only calls drop() if the value is not bitwise zero. This should be sufficient for most types. Also lots of minor cleanups to the C++ API to make it more modern (e.g. using std::optional and std::string_view in some places).
88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
#include "graphml.hh"
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#include "util.hh"
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#include "store-api.hh"
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#include "derivations.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 inline std::string_view xmlQuote(std::string_view s)
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{
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// Luckily, store paths shouldn't contain any character that needs to be
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// quoted.
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return s;
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}
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static string symbolicName(const std::string & p)
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{
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return string(p, p.find('-') + 1);
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}
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static string makeEdge(std::string_view src, std::string_view dst)
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{
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return fmt(" <edge source=\"%1%\" target=\"%2%\"/>\n",
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xmlQuote(src), xmlQuote(dst));
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}
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static string makeNode(const ValidPathInfo & info)
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{
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return fmt(
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" <node id=\"%1%\">\n"
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" <data key=\"narSize\">%2%</data>\n"
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" <data key=\"name\">%3%</data>\n"
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" <data key=\"type\">%4%</data>\n"
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" </node>\n",
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info.path.to_string(),
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info.narSize,
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symbolicName(std::string(info.path.name())),
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(info.path.isDerivation() ? "derivation" : "output-path"));
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}
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void printGraphML(ref<Store> store, StorePathSet && roots)
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{
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StorePathSet workList(std::move(roots));
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StorePathSet doneSet;
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std::pair<StorePathSet::iterator, bool> ret;
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cout << "<?xml version='1.0' encoding='utf-8'?>\n"
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<< "<graphml xmlns='http://graphml.graphdrawing.org/xmlns'\n"
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<< " xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'\n"
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<< " xsi:schemaLocation='http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd'>\n"
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<< "<key id='narSize' for='node' attr.name='narSize' attr.type='int'/>"
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<< "<key id='name' for='node' attr.name='name' attr.type='string'/>"
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<< "<key id='type' for='node' attr.name='type' attr.type='string'/>"
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<< "<graph id='G' edgedefault='directed'>\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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ret = doneSet.insert(path.clone());
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if (ret.second == false) continue;
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auto info = store->queryPathInfo(path);
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cout << makeNode(*info);
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for (auto & p : info->references) {
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if (p != path) {
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workList.insert(p.clone());
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cout << makeEdge(path.to_string(), p.to_string());
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}
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}
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}
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cout << "</graph>\n";
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cout << "</graphml>\n";
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}
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}
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