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1 Introduction

Text editors have traditionally operated in terms of lines and characters. Languide takes a step out of that, providing operations in terms of the syntactic units (statements, expressions) that make up source files in typical programming languages. It aims to provide as single commands many of the routine high-level editing actions that normally take many manual editing operations, for example, taking a block of code and turning it into a function, leaving a call to that function where the code originally was. Although complex, these actions are completely stereotyped, and therefore ripe for automation, as they do not really require human intelligence to perform them. It is hoped that automating them will not only reduce the workload for the user's fingers, but may also be more reliable, and provide a more productive and relaxing working environment. In an attempt to break the tie with keyboard and mouse, on the whole the commands are designed to work well with voice input. It should be possible to work with very little need to type or pronounce syntactic punctuation characters; these are detail that the computer should be able to deal with, leaving the programmer to get on with the abstract thinking. The need to issue a sequence of commands with no punctuation leads naturally to an RPN-style semantics (which should be already comfortable to users of HP-style calculators, Forth, and PostScript). There is, for example, provision for selecting a statement type and then searching for it, or inserting a template for it.


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