On 25 November 2015 at 22:11, Michael Heyns <mike.bean.heyns@xxxxxxxxx> wrote:
> Greetings,
>
> I have a working script checking mimetypes i.e. `text/x-diff`;
> `image/svg+xml` etc.
>
> =================================
> 1 #!/bin/bash
> 2
> 3 _Bold="\e[1m"
> 4 _unBold="\e[22m"
> 5 _Blue="\e[34m"
> 6 _uC="\e[39m"
> 7
> 8 mimetype="$1"
> 9 output="${_Bold}Testing MimeType${_unBold}:\t${mimetype}\n\t-------------"
> 10
> 11 get_default()
> 12 {
> 13 xdg-mime query default "$1"
> 14 }
> 15
> 16 alias_of=`grep "^$mimetype " /usr/share/mime/aliases | cut -d' ' -f2`
> 17 if [ -n "$alias_of" ]; then
> 18 default=`get_default $alias_of`
> 19 output="$output\nWhich is an alias of:\t$alias_of\t->
> ${default:-"none"}"
> 20 else
> 21 output="$output\nWhich is not an alias."
> 22 alias_of=$mimetype
> 23 fi
> 24
> 25 while : ; do
> 26 subclass_of=`grep "^$alias_of " /usr/share/mime/subclasses |
> cut -d' ' -f2`
> 27 if [ -n "$subclass_of" ]; then
> 28 default=`get_default $subclass_of`
> 29 output="$output\nWhich is a subclass of:\t$subclass_of\t->
> ${default:-"none"}"
> 30
> 31 alias_of=$subclass_of
> 32 else
> 33 output="$output\nWhich is not a subclass"
> 34 break
> 35 fi
> 36 done
> 37
> 38 echo -e $output | column -t -s $'\t'
> =================================
>
> Output without bold (line 8) is as expected but with bold, the column
> is widened/broken.
>
> I have removed the rest of the formatting in my example, but with
> colors added it gets much worse.
>
> I think I have narrowed it down to the `column` somehow including the
> escape sequences in its spacing calculation? The same thing happens in
> xterm, gnome-terminal and urxvt.
>
> Is this expected behaviour? I'm learning a lot but sometimes I get a
> headscratcher like this one.
Hi Michael,
I think you are onto something. The issue feels like the same what is
skewing more output, and that I fixed in my upcoming pull request.
https://github.com/kerolasa/lelux-utiliteetit/commit/eeaa3eede07830c80540ab3b4e31ff348bbc1c65
But since the issue is with two utilities the fix really should be
wrote once. Trouble is that what I did with more is no where near
being an universal stream filter that is clearly needed.
--
Sami Kerola
http://www.iki.fi/kerolasa/
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