nix: add postgrest-ctags command

Generates ctags for Haskell and Python code.

nix/tools/devTools.nix

@@ -13,6 +13,8 @@
 , style
 , tests
 , withTools
+, haskellPackages
+, ctags
 }:
 let
  watch =
@@ -292,7 +294,7 @@ let
  parallelCurl =
  checkedShellScript
  {
- name = "parallel-curl";
+ name = "postgrest-parallel-curl";
  docs = "wrapper for using <num> parallel curl requests on the same <host>";
  args = [
  "ARG_POSITIONAL_SINGLE([num], [number of parallel requests])"
@@ -314,6 +316,17 @@ let
  eval "$curl_command"
  '';
 
+ genCtags =
+ checkedShellScript
+ {
+ name = "postgrest-ctags";
+ docs = "Generate ctags for Haskell and Python code";
+ workingDir = "/";
+ }
+ ''
+ ${ctags}/bin/ctags -a -R --fields=+l --languages=python --python-kinds=-iv -f ./tags test/io/
+ ${haskellPackages.hasktags}/bin/hasktags -a -R -c -f ./tags .
+ '';
 in
 buildToolbox
 {
@@ -327,6 +340,7 @@ buildToolbox
  hsieGraphSymbols
  hsieMinimalImports
  parallelCurl
+ genCtags
  pushCachix
  watch;
  };