diff options
Diffstat (limited to 'third_party/nix/src/nix/edit.cc')
-rw-r--r-- | third_party/nix/src/nix/edit.cc | 81 |
1 files changed, 81 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..a6169f1183cd --- /dev/null +++ b/third_party/nix/src/nix/edit.cc @@ -0,0 +1,81 @@ +#include "command.hh" +#include "shared.hh" +#include "eval.hh" +#include "attr-path.hh" +#include "progress-bar.hh" + +#include <unistd.h> + +using namespace nix; + +struct CmdEdit : 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 = state->allocBindings(0); + 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); + 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; + 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"); + + auto args = tokenizeString<Strings>(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); + + stopProgressBar(); + + execvp(args.front().c_str(), stringsToCharPtrs(args).data()); + + throw SysError("cannot run editor '%s'", editor); + } +}; + +static RegisterCommand r1(make_ref<CmdEdit>()); |