Extract Catala version from dune

(avoids multiple, possibly inconsistent, definitions ; also syncs up Clerk
versions with Catala)

build_system/clerk_driver.ml

@@ -20,6 +20,10 @@ open Catala_utils
 open Ninja_utils
 module Nj = Ninja_utils
 
+(* Retrieve current version from dune *)
+let version =
+  Catala_utils.Cli.version
+
 (** {1 Command line interface} *)
 
 let files_or_folders =
@@ -101,8 +105,6 @@ let clerk_t f =
     $ reset_test_outputs
     $ ninja_output)
 
-let version = "0.5.0"
-
 let info =
   let doc =
     "Build system for Catala, a specification language for tax and social \

catala.opam

@@ -25,6 +25,7 @@ depends: [
   "cppo" {>= "1"}
   "dates_calc" {>= "0.0.4"}
   "dune" {>= "2.8"}
+  "dune-build-info" {>= "2.8"}
   "js_of_ocaml-ppx" {= "4.1.0"}
   "menhir" {>= "20200211"}
   "menhirLib" {>= "20200211"}

clerk.opam

@@ -11,6 +11,7 @@ homepage: "https://github.com/CatalaLang/catala"
 bug-reports: "https://github.com/CatalaLang/catala/issues"
 depends: [
   "dune" {>= "2.8"}
+  "dune-build-info" {>= "2.8"}
   "ocaml" {>= "4.11.0"}
   "cmdliner" {>= "1.1.0"}
   "re" {>= "1.9.0"}

compiler/catala_utils/cli.ml

@@ -321,7 +321,11 @@ module Flags = struct
            have some randomness in them."
 end
 
-let version = "0.8.0"
+(* Retrieve current version from dune *)
+let version =
+  Option.value ~default:"dev"
+    Build_info.V1.(Option.map Version.to_string (version ()))
+
 let s_plugins = "INSTALLED PLUGINS"
 
 let info =

compiler/catala_utils/dune

@@ -1,7 +1,7 @@
 (library
  (name catala_utils)
  (public_name catala.catala_utils)
- (libraries unix cmdliner ubase ocolor re bindlib catala.runtime_ocaml))
+ (libraries unix cmdliner ubase ocolor re bindlib catala.runtime_ocaml dune-build-info))
 
 (documentation
  (package catala)

dune-project

@@ -2,8 +2,6 @@
 
 (name catala)
 
-(version 0.8.0)
-
 (generate_opam_files false)
 
 (formatting)