Book Image

Tcl/Tk 8.5 Programming Cookbook

Book Image

Tcl/Tk 8.5 Programming Cookbook

Overview of this book

With Tcl/Tk, you can create full-featured cross-platform applications in a simple and easy-to-understand way without any expensive development package; the only tools required are a simple text editor and your imagination. This practical cookbook will help you to efficiently interact with editors, debuggers, and shell type interactive programs using Tcl/Tk 8. This cookbook will comprehensively guide you through practical implementation of Tcl/Tk 8.5 commands and tools. This book will take you through all the steps needed to become a productive programmer in Tcl/Tk 8. Right from guiding you through the basics to creating a stand-alone application, it provides complete explanation of all the steps along with handy tips and tricks. The book begins with an introduction to the Tcl shell, syntax, variables, and programming best practices in the language. It then explores procedures and the flow of events with control constructs followed by advanced error trapping and recovery. From Chapter 4, a detailed study of string expressions and handling enables you to handle various string functions and use lists to expand the string functionality. The book then discusses in-depth the Tcl Dictionary and how to utilize it to store and retrieve data. File operations and Tk GUI handling are covered extensively along with a developing a real-world address book application to practice the concepts learned.
Table of Contents (20 chapters)
Tcl/Tk 8.5 Programming Cookbook
About the Author
About the Reviewers

Sorting a list

In order to sort a list Tcl has provided the lsort command. As with other commands this one accepts numerous options that we will cover prior to discussing the syntax. The options are as follows:




Sorts using string comparison with Unicode code-point collation order.


Sorts using dictionary style comparison.


Converts the list elements to integers and use integer comparison.


Converts the list elements to floating-point values and use floating-point comparison.

-command command

Uses the command provided as a comparison command.


Sorts in increasing order.


Sorts in decreasing order.


Returns a list of indices in sorted order as opposed to the values.

-index IndexList

For this option to be specified each element of the list must be a proper Tcl sublist.


Sorts using a case-insensitive comparison.


Returns only the last set...