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Diffstat (limited to 'third_party/nix/src/nix/edit.cc')
-rw-r--r-- | third_party/nix/src/nix/edit.cc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/third_party/nix/src/nix/edit.cc b/third_party/nix/src/nix/edit.cc new file mode 100644 index 000000000000..04c67acb94c6 --- /dev/null +++ b/third_party/nix/src/nix/edit.cc @@ -0,0 +1,75 @@ +#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" + +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::New(); + v2 = findAlongAttrPath(*state, "meta.position", dummyArgs.get(), *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").value_or("cat"); + + Strings args = + absl::StrSplit(editor, absl::ByAnyChar(" \t\n\r"), absl::SkipEmpty()); + + 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); + } +}; +} // namespace nix + +static nix::RegisterCommand r1(nix::make_ref<nix::CmdEdit>()); |