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#include <absl/strings/str_split.h>
#include <glog/logging.h>
#include <unistd.h>
#include "libexpr/attr-path.hh"
#include "libexpr/eval.hh"
#include "libmain/shared.hh"
#include "nix/command.hh"
using namespace nix;
struct CmdEdit final : InstallableCommand {
std::string name() override { return "edit"; }
std::string description() override {
return "open the Nix expression of a Nix package in $EDITOR";
}
Examples examples() override {
return {
Example{"To open the Nix expression of the GNU Hello package:",
"nix edit nixpkgs.hello"},
};
}
void run(ref<Store> store) override {
auto state = getEvalState();
auto v = installable->toValue(*state);
Value* v2;
try {
auto dummyArgs = Bindings::NewGC();
v2 = findAlongAttrPath(*state, "meta.position", *dummyArgs, *v);
} catch (Error&) {
throw Error("package '%s' has no source location information",
installable->what());
}
auto pos = state->forceString(*v2);
DLOG(INFO) << "position is " << pos;
auto colon = pos.rfind(':');
if (colon == std::string::npos) {
throw Error("cannot parse meta.position attribute '%s'", pos);
}
std::string filename(pos, 0, colon);
int lineno;
try {
lineno = std::stoi(std::string(pos, colon + 1));
} catch (std::invalid_argument& e) {
throw Error("cannot parse line number '%s'", pos);
}
auto editor = getEnv("EDITOR", "cat");
Strings args = absl::StrSplit(editor, absl::ByAnyChar(" \t\n\r"));
if (editor.find("emacs") != std::string::npos ||
editor.find("nano") != std::string::npos ||
editor.find("vim") != std::string::npos) {
args.push_back(fmt("+%d", lineno));
}
args.push_back(filename);
execvp(args.front().c_str(), stringsToCharPtrs(args).data());
throw SysError("cannot run editor '%s'", editor);
}
};
static RegisterCommand r1(make_ref<CmdEdit>());
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