mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-09-21 17:08:04 +03:00
03ae5e6459
This is a little convenience command that opens the Nix expression of the specified package. For example, nix edit nixpkgs.perlPackages.Moose opens <nixpkgs/pkgs/top-level/perl-packages.nix> in $EDITOR (at the right line number for some editors). This requires the package to have a meta.position attribute.
76 lines
2 KiB
C++
76 lines
2 KiB
C++
#include "command.hh"
|
||
#include "shared.hh"
|
||
#include "eval.hh"
|
||
#include "attr-path.hh"
|
||
|
||
#include <unistd.h>
|
||
|
||
using namespace nix;
|
||
|
||
struct CmdEdit : InstallablesCommand
|
||
{
|
||
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();
|
||
|
||
for (auto & i : installables) {
|
||
auto v = i->toValue(*state);
|
||
|
||
Value * v2;
|
||
try {
|
||
auto dummyArgs = state->allocBindings(0);
|
||
v2 = findAlongAttrPath(*state, "meta.position", *dummyArgs, *v);
|
||
} catch (Error &) {
|
||
throw Error("package ‘%s’ has no source location information", i->what());
|
||
}
|
||
|
||
auto pos = state->forceString(*v2);
|
||
debug("position is %s", 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 = std::stoi(std::string(pos, colon + 1));
|
||
|
||
auto editor = getEnv("EDITOR", "cat");
|
||
|
||
Strings args{editor};
|
||
|
||
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(editor.c_str(), stringsToCharPtrs(args).data());
|
||
|
||
throw SysError("cannot run editor ‘%s’", editor);
|
||
}
|
||
}
|
||
};
|
||
|
||
static RegisterCommand r1(make_ref<CmdEdit>());
|