[Build] Improve

build.js

@@ -1,4 +1,5 @@
 const fs = require( 'fs' );
+
 const navMenu = '' + fs.readFileSync( './src/nav.html' );
 const footer = '' + fs.readFileSync( './src/footer.html' );
 
@@ -11,9 +12,11 @@ const footer = '' + fs.readFileSync( './src/footer.html' );
 const treeWalker = ( dir, extension ) => {
     const ls = fs.readdirSync( dir );
     const fileList = [];
+
     for ( let file in ls ) {
         if ( !ls[ file ].includes( '.' ) ) {
             const newFiles = treeWalker( dir + '/' + ls[ file ], extension );
+
             for ( let file in newFiles ) {
                 fileList.push( newFiles[ file ] );
             }
@@ -23,15 +26,30 @@ const treeWalker = ( dir, extension ) => {
     }
 
     return fileList;
-}
+};
 
 
-const addNavAndFooterToFile = ( file ) => {
+const addNavAndFooterToFile = file => {
     const f = '' + fs.readFileSync( file );
-    const navIndex = f.indexOf( '<nav>' ) + 5;
     const footerIndex = f.indexOf( '<footer>' ) + 8;
-    return f.slice( 0, navIndex ) + navMenu + f.slice( navIndex, footerIndex ) + footer + f.substring( footerIndex );
-}
+
+    let navIndex = f.indexOf( '<nav>' ) + 5;
+    let out = '';
+
+    if ( navIndex >= 5 ) {
+        out += f.slice( 0, navIndex ) + navMenu;
+    } else {
+        navIndex = 0;
+    }
+
+    if ( footerIndex >= 8 ) {
+        out += f.slice( navIndex, footerIndex ) + footer + f.substring( footerIndex );
+    } else {
+        out += f.substring( navIndex );
+    }
+
+    return out;
+};
 
 /**
  * Save a file to a path. All occurrences of "src" will be replaced by "dist"
@@ -42,19 +60,23 @@ const addNavAndFooterToFile = ( file ) => {
 const saveFile = ( filePath, data ) => {
     const nPath = filePath.replace( 'src', 'dist' );
     const dirSplit = nPath.split( '/' );
+
     let currDir = nPath.slice( 0, nPath.indexOf( '/' ) + 1 );
+
     for ( let dir in dirSplit ) {
         if ( dirSplit[ dir ] !== '.' && !dirSplit[ dir ].includes( '.' ) ) {
             currDir += dirSplit[ dir ] + '/';
+
             try {
                 fs.readdirSync( currDir );
-            } catch ( e ) {
+            } catch {
                 fs.mkdirSync( currDir );
             }
         }
     }
+
     fs.writeFileSync( nPath, data );
-}
+};
 
 const copyFiles = ( dir, extension ) => {
     const files = treeWalker( dir, extension );
@@ -62,7 +84,7 @@ const copyFiles = ( dir, extension ) => {
     for ( let file in files ) {
         saveFile( files[ file ], '' + fs.readFileSync( files[ file ] ) );
     }
-}
+};
 
 const filesToParse = treeWalker( './src', '.html' );