Format dotfiles versions before comparison (#207)

Allows both `.node-version` and `.nvmrc` files to contain the same version, if they're formatted into the same version. i.e. `11.10.0` should equal to `v11.10.0`

Closes #206

.gitignore

@@ -10,4 +10,6 @@ fnm.install
 .DS_Store
 *.install
 .tmp
-docs/screen_recording
+docs/screen_recording
+.idea
+.fnmTmp

feature_tests/almost-matching-dotfiles/.node-version

@@ -0,0 +1 @@
+11.10.0

feature_tests/almost-matching-dotfiles/.nvmrc

@@ -0,0 +1 @@
+v11.10.0

feature_tests/almost-matching-dotfiles/run.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+#set -e
+
+eval $(fnm env)
+fnm install
+fnm use
+
+echo node --version
+if [ "$(node --version)" != "v11.10.0" ]; then
+  echo "Expected Node version is not v11.10.0!"
+  exit 1
+fi

library/Dotfiles.re

@@ -20,7 +20,7 @@ let getVersion = () => {
 
   switch (nodeVersion, nvmrc) {
   | (None, None) => Lwt.fail(Version_Not_Provided)
-  | (Some(v1), Some(v2)) when v1 != v2 =>
+  | (Some(v1), Some(v2)) when Versions.format(v1) != Versions.format(v2) =>
     Lwt.fail(Conflicting_Dotfiles_Found(v1, v2))
   | (Some(version), Some(_))
   | (Some(version), None)