76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
#include "command.hh"
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#include "shared.hh"
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#include "eval.hh"
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#include "attr-path.hh"
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#include <unistd.h>
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using namespace nix;
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struct CmdEdit : InstallablesCommand
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{
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std::string name() override
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{
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return "edit";
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}
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std::string description() override
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{
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return "open the Nix expression of a Nix package in $EDITOR";
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}
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Examples examples() override
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{
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return {
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Example{
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"To open the Nix expression of the GNU Hello package:",
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"nix edit nixpkgs.hello"
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},
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};
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}
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void run(ref<Store> store) override
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{
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auto state = getEvalState();
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for (auto & i : installables) {
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auto v = i->toValue(*state);
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Value * v2;
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try {
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auto dummyArgs = state->allocBindings(0);
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v2 = findAlongAttrPath(*state, "meta.position", *dummyArgs, *v);
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} catch (Error &) {
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throw Error("package '%s' has no source location information", i->what());
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}
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auto pos = state->forceString(*v2);
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debug("position is %s", pos);
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auto colon = pos.rfind(':');
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if (colon == std::string::npos)
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throw Error("cannot parse meta.position attribute '%s'", pos);
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std::string filename(pos, 0, colon);
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int lineno = std::stoi(std::string(pos, colon + 1));
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auto editor = getEnv("EDITOR", "cat");
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Strings args{editor};
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if (editor.find("emacs") != std::string::npos ||
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editor.find("nano") != std::string::npos ||
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editor.find("vim") != std::string::npos)
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args.push_back(fmt("+%d", lineno));
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args.push_back(filename);
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execvp(editor.c_str(), stringsToCharPtrs(args).data());
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throw SysError("cannot run editor '%s'", editor);
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}
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}
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};
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static RegisterCommand r1(make_ref<CmdEdit>());
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