From 6f95f4191699186a14a3109f08822189d0f8331e Mon Sep 17 00:00:00 2001
From: Daniil Baturin <daniil@baturin.org>
Date: Thu, 15 Dec 2016 09:54:13 +0600
Subject: Add Directories module for storing directory structure information.

---
 src/directories.ml  | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/directories.mli | 11 +++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 src/directories.ml
 create mode 100644 src/directories.mli

diff --git a/src/directories.ml b/src/directories.ml
new file mode 100644
index 0000000..625b2e3
--- /dev/null
+++ b/src/directories.ml
@@ -0,0 +1,42 @@
+module F = Filename
+module FU = FileUtil
+
+type t = {
+    components: string;
+    validators: string;
+    migrators: string;
+    component_definitions: string;
+    interface_definitions: string;
+}
+
+let relative_dirs = {
+    components = "components";
+    validators = "validators";
+    migrators = "migration";
+    component_definitions = "components";
+    interface_definitions = "interfaces";
+}
+
+let make conf =
+    let open Vyconf_config in
+    {
+      components = F.concat conf.program_dir relative_dirs.components;
+      validators = F.concat conf.program_dir relative_dirs.validators;
+      migrators = F.concat conf.program_dir relative_dirs.migrators;
+      component_definitions = F.concat conf.data_dir relative_dirs.component_definitions;
+      interface_definitions = F.concat conf.data_dir relative_dirs.interface_definitions
+    }
+
+(** Check if required directories exist
+    We do not try to check if they are readable at this point, it's just to fail early
+    if they don't even exist and we shouldn't bother trying
+ *)
+let test dirs =
+     let check_dir d =
+         if FU.test FU.Is_dir d then ()
+         else raise (Failure (Printf.sprintf "%s does not exist or is not a directory" d)) in
+     let l = [dirs.components; dirs.validators; dirs.migrators;
+              dirs.component_definitions; dirs.interface_definitions] in
+     try
+         List.iter check_dir l; Ok ()
+     with Failure msg -> Error msg
diff --git a/src/directories.mli b/src/directories.mli
new file mode 100644
index 0000000..623d6f1
--- /dev/null
+++ b/src/directories.mli
@@ -0,0 +1,11 @@
+type t = {
+    components: string;
+    validators: string;
+    migrators: string;
+    component_definitions: string;
+    interface_definitions: string;
+}
+
+val make : Vyconf_config.t -> t
+
+val test : t -> (unit, string) result
-- 
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