Thanks for the hint. I agree with your analysis, but that still would not explain why the continuation overrides the begining of the same line instead of going to the next line. I think I'll go for the two-lines prompt. If you have a Stack Overflow account, you can post your answer and I will accept it in a couple of days. That would also make some ad for your dynamic R prompt! It's really cool, but overkill for my use.
Hugo 2017-02-07 14:44 GMT+01:00 Gábor Csárdi <csardi.ga...@gmail.com>: > I guess that R does not know about ANSI sequences, and it calculates the > width of the prompt including the characters in the sequences. You cannot > do much about this, except maybe use a prompt that has two lines. You can > put the colored text and whatever you like in the first line, and the > second line can be non-ANSI. > > Note that this works in the terminal, but does not work in RStudio. > RStudio does not support multi-line prompt currently. > > Maybe this is also interesting for you, if you want a dynamic R prompt: > https://github.com/gaborcsardi/prompt#readme (Self-ad, sorry.) > > Gabor > > On Tue, Feb 7, 2017 at 8:59 AM, Hugo Raguet <hugo.rag...@centraliens.net> > wrote: > >> When R is run interactively in a terminal which supports colors, it is >> possible to use ANSI escape sequences in order to put colors in the >> prompt, >> such as >> >> options(prompt = "\033[0;31mThis is red\033[0m> ") >> >> Unfortunately, something goes wrong because for long command lines, the >> line continuation override the prompt instead of being written in the next >> line. The problem gets worse when using several colors, because somehow >> each escape sequence "takes up some space" in the command line, *up to the >> point that the end of the prompt might overwrite the beginning*. On my >> configuration this happens with for instance >> >> options(prompt = paste("\033[0;31m With \033[0;32m multiple", >> "\033[0;33m colors \033[0;34m this", >> "\033[0;35m gets \033[0;36m really", >> "\033[0;37m wrong! \033[0m")) >> >> Why is it so? Is there a workaround? >> >> PS: This rather old post seems related >> >> http://r.789695.n4.nabble.com/Xterm-escape-sequences-in-Prom >> pt-td906375.html >> >> PPS: I posted this question on [R] section of stack overflow >> >> http://stackoverflow.com/questions/42072092/buggy-ansi-escap >> e-sequences-in-r-prompt >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
