From 200d85a1f9eb1735285e04c89ba66634e2bf07f3 Mon Sep 17 00:00:00 2001
From: Julien Roncaglia <julien.roncaglia@itg.com>
Date: Thu, 29 Mar 2018 15:49:12 +0200
Subject: [PATCH] Only write the targets file if it changed

Fixes #13
---
 src/dotnet-proj-info/Inspect.fs | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/dotnet-proj-info/Inspect.fs b/src/dotnet-proj-info/Inspect.fs
index 6b30593c..f7b8832a 100644
--- a/src/dotnet-proj-info/Inspect.fs
+++ b/src/dotnet-proj-info/Inspect.fs
@@ -114,8 +114,20 @@ let writeTargetFile log templates targetFileDestPath =
 </Project>
         """
 
-    log (sprintf "writing helper target file in '%s'" targetFileDestPath)
-    File.WriteAllText(targetFileDestPath, targetFileTemplate.Trim())
+    let targetFileOnDisk =
+        if File.Exists(targetFileDestPath) then
+            try
+                Some (File.ReadAllText targetFileDestPath)
+            with
+            | _ -> None
+        else
+            None
+
+    let newTargetFile = targetFileTemplate.Trim()
+
+    if targetFileOnDisk <> Some newTargetFile then
+        log (sprintf "writing helper target file in '%s'" targetFileDestPath)
+        File.WriteAllText(targetFileDestPath, newTargetFile)
 
     Ok targetFileDestPath