nix search: Add --json flag

src/nix/search.cc

@@ -4,6 +4,8 @@
 #include "eval-inline.hh"
 #include "names.hh"
 #include "get-drvs.hh"
+#include "common-args.hh"
+#include "json.hh"
 
 #include <regex>
 
@@ -19,7 +21,7 @@ std::string hilite(const std::string & s, const std::smatch & m)
           + std::string(m.suffix());
 }
 
-struct CmdSearch : SourceExprCommand
+struct CmdSearch : SourceExprCommand, MixJSON
 {
     std::string re;
 
@@ -50,6 +52,8 @@ struct CmdSearch : SourceExprCommand
 
         bool first = true;
 
+        auto jsonOut = json ? std::make_unique<JSONObject>(std::cout, true) : nullptr;
+
         doExpr = [&](Value * v, std::string attrPath, bool toplevel) {
             debug("at attribute ‘%s’", attrPath);
 
@@ -86,6 +90,15 @@ struct CmdSearch : SourceExprCommand
                         || !nameMatch.empty()
                         || !descriptionMatch.empty())
                     {
+                        if (json) {
+
+                            auto jsonElem = jsonOut->object(attrPath);
+
+                            jsonElem.attr("pkgName", parsed.name);
+                            jsonElem.attr("version", parsed.version);
+                            jsonElem.attr("description", description);
+
+                        } else {
                             if (!first) std::cout << "\n";
                             first = false;
 
@@ -100,6 +113,7 @@ struct CmdSearch : SourceExprCommand
                                 hilite(description, descriptionMatch));
                         }
                     }
+                }
 
                 else if (v->type == tAttrs) {