nix(feat): Add bash completion for git references

nix/tools/devTools.nix

@@ -29,7 +29,7 @@ let
             "ARG_POSITIONAL_SINGLE([command], [Command to run])"
             "ARG_LEFTOVERS([command arguments])"
           ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
         redirectTixFiles = false; # will be done by sub-command
         inRootDir = true;
       }

nix/tools/loadtest.nix

@@ -61,9 +61,12 @@ let
       '';
 
   loadtestAgainst =
+    let
+      name = "postgrest-loadtest-against";
+    in
     checkedShellScript
       {
-        name = "postgrest-loadtest-against";
+        inherit name;
         docs =
           ''
             Run the vegeta loadtest twice:
@@ -74,6 +77,12 @@ let
           "ARG_POSITIONAL_SINGLE([target], [Commit-ish reference to compare with])"
           "ARG_LEFTOVERS([additional vegeta arguments])"
         ];
+        positionalCompletion =
+          ''
+            if test "$prev" == "${name}"; then
+              __gitcomp_nl "$(__git_refs)"
+            fi
+          '';
         inRootDir = true;
       }
       ''

nix/tools/withTools.nix

@@ -27,7 +27,7 @@ let
             "ARG_USE_ENV([PGRST_DB_SCHEMAS], [test], [Schema to expose])"
             "ARG_USE_ENV([PGRST_DB_ANON_ROLE], [postgrest_test_anonymous], [Anonymous PG role])"
           ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
         inRootDir = true;
         redirectTixFiles = false;
         withPath = [ postgresql ];
@@ -118,7 +118,7 @@ let
             "ARG_POSITIONAL_SINGLE([command], [Command to run])"
             "ARG_LEFTOVERS([command arguments])"
           ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
         inRootDir = true;
       }
       (lib.concatStringsSep "\n\n" runners);
@@ -129,9 +129,12 @@ let
   withPg = builtins.head withPgVersions;
 
   withGit =
+    let
+      name = "postgrest-with-git";
+    in
     checkedShellScript
       {
-        name = "postgrest-with-git";
+        inherit name;
         docs =
           ''
             Create a new worktree of the postgrest repo in a temporary directory and
@@ -143,7 +146,14 @@ let
             "ARG_POSITIONAL_SINGLE([command], [Command to run])"
             "ARG_LEFTOVERS([command arguments])"
           ];
-        addCommandCompletion = true; # TODO: first positional argument needs git commit completion
+        positionalCompletion =
+          ''
+            if test "$prev" == "${name}"; then
+              __gitcomp_nl "$(__git_refs)"
+            else
+              _command_offset 2
+            fi
+          '';
         inRootDir = true;
       }
       ''
@@ -229,7 +239,7 @@ let
             "ARG_POSITIONAL_SINGLE([command], [Command to run])"
             "ARG_LEFTOVERS([command arguments])"
           ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
         inRootDir = true;
         withEnv = postgrest.env;
         withTmpDir = true;