Add filter functionality to debug log screen.

debuglogs-viewer/lib/src/main/assets/debuglogs-viewer.js

@@ -52,11 +52,13 @@ editor.session.on("changeScrollLeft", showScrollBar);
 const Range = ace.require("ace/range").Range;
 const session = editor.getSession();
 
+let logLines = ""; // Original logLines
 let input = ""; // Search query input
 let markers = []; // IDs of highlighted search markers
 let matchRanges = []; // Ranges of all search matches
 let matchCount = 0; // Total number of matches
 let isCaseSensitive = false;
+let isFiltered = false;
 
 // Clear all search markers and match info
 function clearMarkers() {
@@ -139,10 +141,34 @@ function onSearchClose() {
 
 function onToggleCaseSensitive() {
   isCaseSensitive = !isCaseSensitive;
-  highlightAllMatches(input);
+  (isFiltered) ? onFilter() : highlightAllMatches(input);
 }
 
 function onSearchInput(value) {
   input = value;
+}
+
+function onSearch() {
   highlightAllMatches(input);
 }
+
+function onFilter() {
+  isFiltered = true;
+  editor.getSelection().clearSelection();
+  clearMarkers();
+  const filtered = logLines
+    .split("\n")
+    .filter((line) => {
+      const newLine = isCaseSensitive ? line : line.toLowerCase();
+      return newLine.includes(isCaseSensitive ? input : input.toLowerCase());
+    })
+    .join("\n");
+
+  editor.setValue(filtered, -1);
+}
+
+function onFilterClose() {
+  isFiltered = false;
+  editor.setValue(logLines, -1);
+  highlightAllMatches(input);
+}

debuglogs-viewer/lib/src/main/java/org/signal/debuglogsviewer/DebugLogsViewer.kt

@@ -47,7 +47,7 @@ object DebugLogsViewer {
   fun presentLines(webview: WebView, lines: String) {
     // Set the debug log lines
     val escaped = JSONObject.quote(lines)
-    webview.evaluateJavascript("editor.insert($escaped);", null)
+    webview.evaluateJavascript("editor.insert($escaped); logLines=$escaped;", null)
   }
 
   @JvmStatic
@@ -61,10 +61,25 @@ object DebugLogsViewer {
   }
 
   @JvmStatic
-  fun onSearch(webview: WebView, query: String) {
+  fun onSearchInput(webview: WebView, query: String) {
     webview.evaluateJavascript("onSearchInput('$query')", null)
   }
 
+  @JvmStatic
+  fun onSearch(webview: WebView) {
+    webview.evaluateJavascript("onSearch()", null)
+  }
+
+  @JvmStatic
+  fun onFilter(webview: WebView) {
+    webview.evaluateJavascript("onFilter()", null)
+  }
+
+  @JvmStatic
+  fun onFilterClose(webview: WebView) {
+    webview.evaluateJavascript("onFilterClose()", null)
+  }
+
   @JvmStatic
   fun onSearchUp(webview: WebView) {
     webview.evaluateJavascript("onSearchUp();", null)
@@ -90,10 +105,6 @@ object DebugLogsViewer {
     webview.evaluateJavascript("onSearchClose();", null)
   }
 
-  @JvmStatic
-  fun onFilter(webview: WebView) {
-  }
-
   @JvmStatic
   fun onEdit(webview: WebView) {
     readOnly = !readOnly