From 272aa4c50b03386618aacad7ffbad9d85cf1e22d Mon Sep 17 00:00:00 2001
From: davidramnero <davidramnero@hotmail.com>
Date: Wed, 17 Jun 2026 17:54:41 +0200
Subject: [PATCH 1/3] feature / #68 skip running checks if file content has not
 changed

---
 src/extension.ts | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/extension.ts b/src/extension.ts
index 4387e4a..a872da4 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1,11 +1,15 @@
 import * as vscode from 'vscode';
 import * as cp from 'child_process';
 import * as xml2js from 'xml2js';
+import * as crypto from 'crypto';
 
 import { documentationLinkMap, getPremiumCertLink } from './util/documentation';
 import { runCommand } from './util/scripts';
 import { looksLikePath, resolvePath, findWorkspaceRoot } from './util/path';
 
+// To keep track of document changes we save hashed versions of their content to this record
+let documentHashMemory : Record<string, string> = {};
+
 enum SeverityNumber {
     Info = 0,
     Warning = 1,
@@ -64,6 +68,13 @@ function parseMinSeverity(str: string): SeverityNumber {
     }
 }
 
+function getDocumentSha1(document: vscode.TextDocument): string {
+    return crypto
+        .createHash('sha1')
+        .update(document.getText(), 'utf8')
+        .digest('hex');
+}
+
 // This method is called when your extension is activated.
 // Your extension is activated the very first time the command is executed.
 export async function activate(context: vscode.ExtensionContext) {
@@ -92,6 +103,15 @@ export async function activate(context: vscode.ExtensionContext) {
             return;
         }
 
+        if ((Object.keys(documentHashMemory) as Array<string>).includes(document.fileName)) {
+            // Check file content against memory, if it has not changed since last check do early return
+            const newHash = getDocumentSha1(document);
+            const oldHash = documentHashMemory[document.fileName];
+            if (newHash === oldHash) {
+                return;
+            }
+        }
+
         // Check if the document is visible in any editor
         const isVisible = vscode.window.visibleTextEditors.some(editor =>
             editor.document.uri.toString().replaceAll('\\', '/') === document.uri.toString().replaceAll('\\', '/'));
@@ -148,6 +168,10 @@ export async function activate(context: vscode.ExtensionContext) {
             minSevString,
             diagnosticCollection
         );
+
+        // Save hashed document content to memory
+        const hashedContentOfFile = getDocumentSha1(document);
+        documentHashMemory[document.fileName] = hashedContentOfFile;
     }
 
     // Listen for file saves.

From be709ca3b4f8b81c519f9e9319401bfa9be39589 Mon Sep 17 00:00:00 2001
From: davidramnero <davidramnero@hotmail.com>
Date: Thu, 18 Jun 2026 14:00:12 +0200
Subject: [PATCH 2/3] only save hashed file if checks ran without error

---
 src/extension.ts | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/extension.ts b/src/extension.ts
index bf02cb4..9f0613d 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -123,7 +123,9 @@ export async function activate(context: vscode.ExtensionContext) {
             // Check file content against memory, if it has not changed since last check do early return
             const newHash = getDocumentSha1(document);
             const oldHash = documentHashMemory[document.fileName];
+            console.log('documentHashMemory keys', Object.keys(documentHashMemory).join(', '));
             if (newHash === oldHash) {
+                console.log('hash matched, skipping run', newHash);
                 return;
             }
         }
@@ -184,10 +186,6 @@ export async function activate(context: vscode.ExtensionContext) {
             minSevString,
             diagnosticCollection
         );
-
-        // Save hashed document content to memory
-        const hashedContentOfFile = getDocumentSha1(document);
-        documentHashMemory[document.fileName] = hashedContentOfFile;
     }
 
     // Listen for file saves.
@@ -368,6 +366,13 @@ async function runCppcheckOnFileXML(
             }
             diagnosticCollection.set(document.uri, diagnostics);
         });
+
+        // If checks have run without error, save hashed document content to memory
+        if (!code) {
+            const hashedContentOfFile = getDocumentSha1(document);
+            console.log('checks ran succesfully, saving hashed file', document.fileName, hashedContentOfFile);
+            documentHashMemory[document.fileName] = hashedContentOfFile;
+        }
     });
 
     checksRunning = false;

From e9a06aef31f85ac0a8b5934615e6ea59cbb14055 Mon Sep 17 00:00:00 2001
From: davidramnero <davidramnero@hotmail.com>
Date: Mon, 22 Jun 2026 14:03:12 +0200
Subject: [PATCH 3/3] removed console ligs

---
 src/extension.ts | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/extension.ts b/src/extension.ts
index 9f0613d..7e75948 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -123,9 +123,7 @@ export async function activate(context: vscode.ExtensionContext) {
             // Check file content against memory, if it has not changed since last check do early return
             const newHash = getDocumentSha1(document);
             const oldHash = documentHashMemory[document.fileName];
-            console.log('documentHashMemory keys', Object.keys(documentHashMemory).join(', '));
             if (newHash === oldHash) {
-                console.log('hash matched, skipping run', newHash);
                 return;
             }
         }
@@ -370,7 +368,6 @@ async function runCppcheckOnFileXML(
         // If checks have run without error, save hashed document content to memory
         if (!code) {
             const hashedContentOfFile = getDocumentSha1(document);
-            console.log('checks ran succesfully, saving hashed file', document.fileName, hashedContentOfFile);
             documentHashMemory[document.fileName] = hashedContentOfFile;
         }
     });