7 files changed, 44 insertions, 11 deletions

diff --git a/src/nix/cat.cc b/src/nix/cat.cc
index eeee1e529..b528a0507 100644
--- a/src/nix/cat.cc
+++ b/src/nix/cat.cc
@@ -25,7 +25,11 @@ struct CmdCatStore : StoreCommand, MixCat
 {
     CmdCatStore()
     {
-        expectPathArg("path", &path);
+        expectArgs({
+            .label = "path",
+            .handler = {&path},
+            .completer = completePath
+        });
     }
 
     std::string description() override
@@ -47,7 +51,11 @@ struct CmdCatNar : StoreCommand, MixCat
 
     CmdCatNar()
     {
-        expectPathArg("nar", &narPath);
+        expectArgs({
+            .label = "nar",
+            .handler = {&narPath},
+            .completer = completePath
+        });
         expectArg("path", &path);
     }
 
diff --git a/src/nix/command.hh b/src/nix/command.hh
index 6b4781303..0738c0f91 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -73,10 +73,7 @@ struct InstallablesCommand : virtual Args, SourceExprCommand
 {
     std::vector<std::shared_ptr<Installable>> installables;
 
-    InstallablesCommand()
-    {
-        expectArgs("installables", &_installables);
-    }
+    InstallablesCommand();
 
     void prepare() override;
 
diff --git a/src/nix/hash.cc b/src/nix/hash.cc
index 0f460c668..d5636eb47 100644
--- a/src/nix/hash.cc
+++ b/src/nix/hash.cc
@@ -31,7 +31,11 @@ struct CmdHash : Command
             .labels({"modulus"})
             .dest(&modulus);
         #endif
-        expectPathArgs("paths", &paths);
+        expectArgs({
+            .label = "paths",
+            .handler = {&paths},
+            .completer = completePath
+        });
     }
 
     std::string description() override
diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index c144a7e70..abc642e11 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -571,6 +571,14 @@ StorePathSet toDerivations(ref<Store> store,
     return drvPaths;
 }
 
+InstallablesCommand::InstallablesCommand()
+{
+    expectArgs({
+        .label = "installables",
+        .handler = {&_installables},
+    });
+}
+
 void InstallablesCommand::prepare()
 {
     if (_installables.empty() && useDefaultInstallables())
diff --git a/src/nix/ls.cc b/src/nix/ls.cc
index aac082422..dc7e370b9 100644
--- a/src/nix/ls.cc
+++ b/src/nix/ls.cc
@@ -85,7 +85,11 @@ struct CmdLsStore : StoreCommand, MixLs
 {
     CmdLsStore()
     {
-        expectPathArg("path", &path);
+        expectArgs({
+            .label = "path",
+            .handler = {&path},
+            .completer = completePath
+        });
     }
 
     Examples examples() override
@@ -117,7 +121,11 @@ struct CmdLsNar : Command, MixLs
 
     CmdLsNar()
     {
-        expectPathArg("nar", &narPath);
+        expectArgs({
+            .label = "nar",
+            .handler = {&narPath},
+            .completer = completePath
+        });
         expectArg("path", &path);
     }
 
diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index 2e7b14d08..c936f9cc2 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -767,7 +767,11 @@ struct CmdRepl : StoreCommand, MixEvalArgs
 
     CmdRepl()
     {
-        expectPathArgs("files", &files);
+        expectArgs({
+            .label = "files",
+            .handler = {&files},
+            .completer = completePath
+        });
     }
 
     std::string description() override
diff --git a/src/nix/run.cc b/src/nix/run.cc
index 3701ffe3d..f9b1298f1 100644
--- a/src/nix/run.cc
+++ b/src/nix/run.cc
@@ -149,7 +149,11 @@ struct CmdRun : InstallableCommand, RunCommon
 
     CmdRun()
     {
-        expectPathArgs("args", &args);
+        expectArgs({
+            .label = "args",
+            .handler = {&args},
+            .completer = completePath
+        });
     }
 
     std::string description() override