Difference between revisions of "Getting Started with Recital"
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===Integrating our Recital Hello World Program with bash=== | ===Integrating our Recital Hello World Program with bash=== | ||
| − | We can also run the program without user interaction and redirect the output. Modify ''test.prg'' to | + | We can also run the program without user interaction and redirect the output. Modify ''test.prg'' to remove the [[WAIT|wait]] command: |
<pre> | <pre> | ||
? "Hello World" | ? "Hello World" | ||
| − | |||
</pre> | </pre> | ||
Revision as of 11:19, 23 July 2010
Contents
Getting Started with Recital
Starting the Recital Workbench
One of the most useful tools for writing Recital code is the Recital Workbench, a character mode interactive editing, debugging and execution environment in which commands are run as you type them and press Return.
You run recital by typing "recital" at a shell prompt. Linux also has a man page that describes how to use the recital command.
$ recital $ recital --help $ man recital
To exit the Recital Workbench, type quit at the prompt:
> quit
Running Recital Programs
You can execute Recital programs or scripts in one of two ways: from the command line (e.g. bash) or through a web server such as Apache on Linux/UNIX or IIS on Windows. For the development of Recital applications that will be run from the command line, the Recital Workbench provides all the tools you will need to develop, debug, and test your applications.
Create a Hello World Program
Recital uses the vi/vim editor on UNIX/Linux by default, although you can set an alternative editor with the set tedit command. A simple text editor, called using the textedit() function is also provided.
So, create a file called test.prg using your preferred editor and add the following lines to display the text Hello World followed by a line feed:
? "Hello World" ?
Save the file.
Running the Hello World Program
You can run the program using the do command from the Recital Workbench prompt:
> do test
Or using recital from the shell prompt:
$ recital test
You will notice that when you run the script from the shell prompt, the text display flashes on the screen. To have time to read the text, Recital needs to go into a read or wait state. Modify your test.prg file as follows:
? "Hello World" wait
Save the file, then run it again from the shell prompt:
$ recital test
This time, after displaying Hello World, Recital will prompt you to press a key before continuing.
Integrating our Recital Hello World Program with bash
We can also run the program without user interaction and redirect the output. Modify test.prg to remove the wait command:
? "Hello World"
Then, from the shell prompt:
$ recital < test.prg > output.txt
This time, no text will be displayed on the screen; it will be sent to the file output.txt instead.
