lix/src/nix/edit.cc
John Ericson c998e0172f Move value-only methods to InstallableValue
These methods would previously fail on the other `Installable`s, so
moving them to this class is more correct as to where they actually
work.

Additionally, a `InstallableValueCommand` is created to make it easier
(or rather no worse than before) to write commands that just work on
`InstallableValue`s.

Besides being a cleanup to avoid failing default methods, this gets us
closer to https://github.com/NixOS/rfcs/pull/134.
2023-03-16 20:06:46 -04:00

57 lines
1.4 KiB
C++

#include "command-installable-value.hh"
#include "shared.hh"
#include "eval.hh"
#include "attr-path.hh"
#include "progress-bar.hh"
#include "editor-for.hh"
#include <unistd.h>
using namespace nix;
struct CmdEdit : InstallableValueCommand
{
std::string description() override
{
return "open the Nix expression of a Nix package in $EDITOR";
}
std::string doc() override
{
return
#include "edit.md"
;
}
Category category() override { return catSecondary; }
void run(ref<Store> store, ref<InstallableValue> installable) override
{
auto state = getEvalState();
const auto [file, line] = [&] {
auto [v, pos] = installable->toValue(*state);
try {
return findPackageFilename(*state, *v, installable->what());
} catch (NoPositionInfo &) {
throw Error("cannot find position information for '%s", installable->what());
}
}();
stopProgressBar();
auto args = editorFor(file, line);
restoreProcessContext();
execvp(args.front().c_str(), stringsToCharPtrs(args).data());
std::string command;
for (const auto &arg : args) command += " '" + arg + "'";
throw SysError("cannot run command%s", command);
}
};
static auto rCmdEdit = registerCommand<CmdEdit>("edit");