![]() ![]() Nevertheless, it's possible to write programs that make use of ANSI escape codes, and at least will work on common Unix systems like Ubuntu or OS-X (though not Windows, which I won't cover here and is its own adventure!). Wikipedia has a reasonable listing of them, as do many other sites. Various terminals support different subsets of these codes, and it's difficult to find a "authoritative" list of what every code does. These are special codes that your program can print in order to give the terminal instructions. The way that most programs interact with the Unix terminal is through ANSI escape codes. If you enjoyed the contents on this blog, you may also enjoy Haoyi's book Hands-on Scala Programming This post will explore the basics of how you can control the terminal from any command-line program, with examples in Python, and how your own code can directly make use of all the special features the terminal has to offer.Ībout the Author: Haoyi is a software engineer, and the author of many open-source Scala tools such as the Ammonite REPL and the Mill Build Tool. There are libraries like Readline, JLine, or the Python Prompt Toolkit that help you do this in various programming languages, but you can also do it yourself. This is what lets programs like Git implement its dynamic progress indicators, and Vim or Bash implement their editors that let you modify already-displayed text without scrolling the terminal. less rings the bell when you go past the end of the file, iTerm behaves correctly and does not lock up.Strategic Scala Style: Designing Datatypes Scala Scripting and the 15 Minute Blog EngineĮveryone is used to programs printing out output in a terminal that scrolls as new text appears, but that's not all your can do: your program can color your text, move the cursor up, down, left or right, or clear portions of the screen if you are going to re-print them later. ![]() The terminal bell is just my guess about what code might be causing the issue. It's a jarring effect that makes iTerm feel slow and unresponsive. ![]() iTerm makes 'less' behave as if you are piping to it the output of a running process that has yet to provide more output. It sounds like a relatively minor bug, it is irritating because the behavior is confusing. Holding down space to create lots of page down actions to hit the end of the file will behave the same, but pressing the up arrow will immediately take effect. It's as if the program has jammed up.Įxpected behavior is like the normal Terminal app. Nothing will happen for a second or so, the terminal won't update or respond to keypresses. the end of the file is reached), press the up arrow key to scroll up a line. As soon as the screen stops updating (i.e. 'sysctl -a |less' Hold down space to rapidly page down to reach the end, and attempt to go past, the end of the file. To reproduce, make sure the mentioned line is in ~/.inputrc, then create a new terminal and run a command that would complete instantly and produce several screens of text, and pipe the output to less. having the line 'set bell-style none' in ~/.inputrc - rather than iTerm's own bell options. I'm not sure whether this is something related to the terminal bell, it is only reproducible when my terminal is configured not to ring the terminal bell. ITerm seems to 'freeze up' when trying to view past the end of a file with less. ![]()
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