Step-9 Validation

• Use regexp package and create the global variable validPath to store our validation expression.
• Add the function getTitle that uses the validPath expression to validate path and extract the page title.
• Put a call to getTitle in each of the handlers.

Step-8 Template Caching

• Refactor to call ParseFiles once at program initialization, parsing all templates into a single *Template.
• Create the global variable named templates, and initialize it with ParseFiles.
• Modify the renderTemplate function to call the templates.ExecuteTemplate method with the name of the appropriate template.

Step-7 More Error Handling

• Handle errors in renderTemplate.
• Handle errors in saveTemplate.

Step-6 Saving Pages

• Implement the saveHandler and uncommenting the related line in main.

Step-5 Refactor

• Move all templating code to its own function.
• Handle non-existent pages in viewHandler.

Step-4 Better HTML

• Use html/template to keep the HTML in a separate file.
• Keep hard-coded HTMLs in separate files.

Step-3 Editing Pages

• Add the editHandler

Step-2 Serve Pages

• Use net/http package to serve our wiki pages.
• Add the viewHandler to handle URLs.
• create some page data like test.txt

Step-10 Using Function Literals and Closures

• Re-write the function definition of each of the handlers to accept a title string.
• Define the wrapper function that takes a function of the above type, and returns a function of type http.HandlerFunc.
• Wrap the handler functions with makeHandler in main.
• Remove the calls to getTitle from the handler functions, making them much simpler.

Step-1 Error Handling

• Modify the loadPage to let it return an error if ReadFile encounters one.