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nix flake show --json: Add type info

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For extensibility, every leaf node is now an object that contains at
least a type field (e.g. "type": "derivation").
This commit is contained in:
Eelco Dolstra 2021-09-14 17:18:29 +02:00
parent f3259af73e
commit 1fbaf36729
1 changed files with 42 additions and 41 deletions
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83
src/nix/flake.cc
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@ -876,56 +876,54 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
auto state = getEvalState();
auto flake = std::make_shared<LockedFlake>(lockFlake());
std::function<void(eval_cache::AttrCursor & visitor, const std::vector<Symbol> & attrPath, const std::string & headerPrefix, const std::string & nextPrefix)> visit;
std::function<nlohmann::json(
eval_cache::AttrCursor & visitor,
const std::vector<Symbol> & attrPath,
const std::string & headerPrefix,
const std::string & nextPrefix)> visit;
nlohmann::json j;
// Populate json attributes along `attrPath` with a leaf value of `name`
auto populateJson = [&](const std::vector<Symbol> & attrPath, const std::string name)
visit = [&](
eval_cache::AttrCursor & visitor,
const std::vector<Symbol> & attrPath,
const std::string & headerPrefix,
const std::string & nextPrefix)
-> nlohmann::json
{
nlohmann::json* r = & j;
for (const auto & element : attrPath){
(*r)[element] = (*r)[element].is_null() ? nlohmann::json({}) : (*r)[element];
r = & (*r)[element];
}
(*r) = name;
};
auto j = nlohmann::json::object();
visit = [&](eval_cache::AttrCursor & visitor, const std::vector<Symbol> & attrPath, const std::string & headerPrefix, const std::string & nextPrefix)
{
Activity act(*logger, lvlInfo, actUnknown,
fmt("evaluating '%s'", concatStringsSep(".", attrPath)));
try {
auto recurse = [&]()
{
if (!json){
if (!json)
logger->cout("%s", headerPrefix);
}
auto attrs = visitor.getAttrs();
for (const auto & [i, attr] : enumerate(attrs)) {
bool last = i + 1 == attrs.size();
auto visitor2 = visitor.getAttr(attr);
auto attrPath2(attrPath);
attrPath2.push_back(attr);
visit(*visitor2, attrPath2,
auto j2 = visit(*visitor2, attrPath2,
fmt(ANSI_GREEN "%s%s" ANSI_NORMAL ANSI_BOLD "%s" ANSI_NORMAL, nextPrefix, last ? treeLast : treeConn, attr),
nextPrefix + (last ? treeNull : treeLine));
if (json) j.emplace(attr, std::move(j2));
}
};
auto showDerivation = [&]()
{
auto name = visitor.getAttr(state->sName)->getString();
/*
std::string description;
if (auto aMeta = visitor.maybeGetAttr("meta")) {
if (auto aDescription = aMeta->maybeGetAttr("description"))
description = aDescription->getString();
}
*/
if (json){
populateJson(attrPath,name);
if (json) {
std::optional<std::string> description;
if (auto aMeta = visitor.maybeGetAttr("meta")) {
if (auto aDescription = aMeta->maybeGetAttr("description"))
description = aDescription->getString();
}
j.emplace("type", "derivation");
j.emplace("name", name);
if (description)
j.emplace("description", *description);
} else {
logger->cout("%s: %s '%s'",
headerPrefix,
@ -996,8 +994,8 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
auto aType = visitor.maybeGetAttr("type");
if (!aType || aType->getString() != "app")
throw EvalError("not an app definition");
if(json){
populateJson(attrPath,"app");
if (json) {
j.emplace("type", "app");
} else {
logger->cout("%s: app", headerPrefix);
}
@ -1008,21 +1006,23 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
(attrPath.size() == 2 && attrPath[0] == "templates"))
{
auto description = visitor.getAttr("description")->getString();
if(json){
populateJson(attrPath,description);
if (json) {
j.emplace("type", "template");
j.emplace("description", description);
} else {
logger->cout("%s: template: " ANSI_BOLD "%s" ANSI_NORMAL, headerPrefix, description);
}
}
else {
auto description = (attrPath.size() == 1 && attrPath[0] == "overlay")
|| (attrPath.size() == 2 && attrPath[0] == "overlays") ? "Nixpkgs overlay" :
attrPath.size() == 2 && attrPath[0] == "nixosConfigurations" ? "NixOS configuration" :
attrPath.size() == 2 && attrPath[0] == "nixosModules" ? "NixOS module" :
"unknown";
if(json){
populateJson(attrPath,description);
auto [type, description] =
(attrPath.size() == 1 && attrPath[0] == "overlay")
|| (attrPath.size() == 2 && attrPath[0] == "overlays") ? std::make_pair("nixpkgs-overlay", "Nixpkgs overlay") :
attrPath.size() == 2 && attrPath[0] == "nixosConfigurations" ? std::make_pair("nixos-configuration", "NixOS configuration") :
attrPath.size() == 2 && attrPath[0] == "nixosModules" ? std::make_pair("nixos-module", "NixOS module") :
std::make_pair("unknown", "unknown");
if (json) {
j.emplace("type", type);
} else {
logger->cout("%s: " ANSI_WARNING "%s" ANSI_NORMAL, headerPrefix, description);
}
@ -1031,14 +1031,15 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
if (!(attrPath.size() > 0 && attrPath[0] == "legacyPackages"))
throw;
}
return j;
};
auto cache = openEvalCache(*state, flake);
visit(*cache->getRoot(), {}, fmt(ANSI_BOLD "%s" ANSI_NORMAL, flake->flake.lockedRef), "");
if(json){
auto j = visit(*cache->getRoot(), {}, fmt(ANSI_BOLD "%s" ANSI_NORMAL, flake->flake.lockedRef), "");
if (json)
logger->cout("%s", j.dump());
}
}
};