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nix path-info: Add --json flag

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Also, factor out JSON generation from value-to-json.{cc,hh}, and
support producing indented JSON.
This commit is contained in:
Eelco Dolstra 2016-08-26 18:55:55 +02:00
parent 9fa21765e7
commit c0a7b84748
7 changed files with 476 additions and 133 deletions
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15
src/nix-env/nix-env.cc
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@ -10,6 +10,7 @@
#include "store-api.hh"
#include "user-env.hh"
#include "util.hh"
#include "json.hh"
#include "value-to-json.hh"
#include "xml-writer.hh"
@ -860,26 +861,24 @@ static VersionDiff compareVersionAgainstSet(
static void queryJSON(Globals & globals, vector<DrvInfo> & elems)
{
JSONObject topObj(cout);
JSONObject topObj(cout, true);
for (auto & i : elems) {
topObj.attr(i.attrPath);
JSONObject pkgObj(cout);
JSONObject pkgObj = topObj.object(i.attrPath);
pkgObj.attr("name", i.name);
pkgObj.attr("system", i.system);
pkgObj.attr("meta");
JSONObject metaObj(cout);
JSONObject metaObj = pkgObj.object("meta");
StringSet metaNames = i.queryMetaNames();
for (auto & j : metaNames) {
metaObj.attr(j);
auto placeholder = metaObj.placeholder(j);
Value * v = i.queryMeta(j);
if (!v) {
printMsg(lvlError, format("derivation ‘%1%’ has invalid meta attribute ‘%2%’") % i.name % j);
cout << "null";
placeholder.write(nullptr);
} else {
PathSet context;
printValueAsJSON(*globals.state, true, *v, cout, context);
printValueAsJSON(*globals.state, true, *v, placeholder, context);
}
}
}