Add documentation for confusing function

lib/webview-helpers.js

@@ -95,9 +95,14 @@ helpers.procFromWebview = async function (adb, webview) {
   let pidIndex = header.indexOf('PID');
   let pkgIndex = header.indexOf('NAME');
 
-  function slice (line, index) {
+  /*
+   * Get the entry based on the position of the header. The entry can be aligned
+   * either the beginning or the end of the header, so the start of the entry
+   * can be before the header starts or after. Figure that out.
+   */
+  function getEntry (line, headerIndex) {
     // first find the beginning
-    let start = index;
+    let start = headerIndex;
     if (line[start] === ' ') {
       // the entry has not started yet, so move to the right until we have it
       while (start < line.length) {
@@ -122,9 +127,9 @@ helpers.procFromWebview = async function (adb, webview) {
   }
 
   for (let line of lines) {
-    let pidEntry = slice(line, pidIndex);
+    let pidEntry = getEntry(line, pidIndex);
     if (pidEntry === pid) {
-      pkg = slice(line, pkgIndex);
+      pkg = getEntry(line, pkgIndex);
       logger.debug(`Parsed pid: '${pidEntry}' pkg: '${pkg}' from`);
       logger.debug(`    ${header}`);
       logger.debug(`    ${line}`);