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nix repl: add :edit command

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This allows to have a repl-centric workflow to working on nixpkgs.

Usage:

    :edit <package> - heuristic that find the package file path

    :edit <path> - just open the editor on the file path

Once invoked, `nix repl` will open $EDITOR on that file path. Once the
editor exits, `nix repl` will automatically reload itself.
This commit is contained in:
Jonas Chevalier 2019-10-23 15:29:16 +02:00
parent 389a2cebed
commit 73ff84f6a8
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GPG key ID: 71BAF6D40C1D63D7
1 changed files with 57 additions and 0 deletions
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57
src/nix/repl.cc
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@ -22,6 +22,7 @@ extern "C" {
#include "shared.hh"
#include "eval.hh"
#include "eval-inline.hh"
#include "attr-path.hh"
#include "store-api.hh"
#include "common-eval-args.hh"
#include "get-drvs.hh"
@ -440,6 +441,7 @@ bool NixRepl::processLine(string line)
<< " <x> = <expr> Bind expression to variable\n"
<< " :a <expr> Add attributes from resulting set to scope\n"
<< " :b <expr> Build derivation\n"
<< " :e <expr> Open the derivation in $EDITOR\n"
<< " :i <expr> Build derivation, then install result into current profile\n"
<< " :l <path> Load Nix expression and add it to scope\n"
<< " :p <expr> Evaluate and print expression recursively\n"
@ -466,6 +468,61 @@ bool NixRepl::processLine(string line)
reloadFiles();
}
else if (command == ":e" || command == ":edit") {
Value v;
evalString(arg, v);
std::string filename;
int lineno = 0;
if (v.type == tPath || v.type == tString) {
PathSet context;
filename = state.coerceToString(noPos, v, context);
lineno = 0;
} else {
// assume it's a derivation
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", arg);
}
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);
filename = std::string(pos, 0, colon);
try {
lineno = std::stoi(std::string(pos, colon + 1));
} catch (std::invalid_argument & e) {
throw Error("cannot parse line number '%s'", pos);
}
}
// Open in EDITOR
auto editor = getEnv("EDITOR", "cat");
auto args = tokenizeString<Strings>(editor);
if (lineno > 0 && (
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);
editor = args.front();
args.pop_front();
runProgram(editor, args);
// Reload right after exiting the editor
state.resetFileCache();
reloadFiles();
}
else if (command == ":t") {
Value v;
evalString(arg, v);