c10c61449f
Also, move a few free-standing functions into StoreAPI and Derivation. Also, introduce a non-nullable smart pointer, ref<T>, which is just a wrapper around std::shared_ptr ensuring that the pointer is never null. (For reference-counted values, this is better than passing a "T&", because the latter doesn't maintain the refcount. Usually, the caller will have a shared_ptr keeping the value alive, but that's not always the case, e.g., when passing a reference to a std::thread via std::bind.)
72 lines
1.4 KiB
C++
72 lines
1.4 KiB
C++
#include "xmlgraph.hh"
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#include "util.hh"
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#include "store-api.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 const string & xmlQuote(const string & 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 makeEdge(const string & src, const string & dst)
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{
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format f = format(" <edge src=\"%1%\" dst=\"%2%\"/>\n")
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% xmlQuote(src) % xmlQuote(dst);
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return f.str();
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}
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static string makeNode(const string & id)
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{
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format f = format(" <node name=\"%1%\"/>\n") % xmlQuote(id);
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return f.str();
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}
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void printXmlGraph(StoreAPI & store, const PathSet & roots)
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{
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PathSet workList(roots);
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PathSet doneSet;
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cout << "<?xml version='1.0' encoding='utf-8'?>\n"
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<< "<nix>\n";
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while (!workList.empty()) {
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Path path = *(workList.begin());
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workList.erase(path);
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if (doneSet.find(path) != doneSet.end()) continue;
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doneSet.insert(path);
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cout << makeNode(path);
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PathSet references;
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store.queryReferences(path, references);
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for (PathSet::iterator i = references.begin();
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i != references.end(); ++i)
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{
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if (*i != path) {
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workList.insert(*i);
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cout << makeEdge(*i, path);
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}
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}
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}
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cout << "</nix>\n";
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}
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}
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