On 12/14/11 02:19, MacArthur, Ian (SELEX GALILEO, UK) wrote:
>> [html suggestion]
>> the limited pseudo-html syntax that is used by Qt and Pango
>> and possibly a large number of other pieces of software.
>>
>> This would let users write "foo <b>bold<i>bold
>> italic</i></b>" and so on.
> Greg's idea (ANSI "inspired" sequences) does have some appeal too,
> though, and the extended version of Greg's proposal was that we could
> have support for different mark-up styles, flagged in the widget.
There are probably practical reasons to use both.
*though I agree with Bill, HTML is the saner choice for general cases.*
The reason I gravitated towards ANSI was:
o I was displaying a command line tool's color output in the GUI
o ANSI is generally shorter sequences (html can end up being more chars)
o Parsing speed (ANSI can be implemented with a switch statement,
parsing is fast)
I suppose if I hadn't been working with a command line tool that
printed out color progress bars to a terminal, I would have gone
the HTML route.
Seems like both ideas would perhaps be useful,.
Certainly html is more readable when inlined in code:
const char *msg = "<b>Alert!</b><br>Your printer is on fire";
vs.
#define BOLD_ON "\e[1m"
#define BOLD_OFF "\e[0m"
const char *msg = BOLD_ON "Alert!" BOLD_OFF "\nYour printer is on fire";
There are several concepts that neither have or share, so we'd
have to come up with extensions to support them. For instance,
eg. html doesn't have a way to control bgcolor (other than css or tables)
or 'dim',
and ansi doesn't have a way to set font face or size.
BTW, as a related aside, here's a fun little one liner perl that shows
a 32 value grayscale that works on all X based linux terminals:
perl -e 'for($y=0;$y<5;$y++){for($t=232;$t<256;$t++){printf("\e[48;5;${t}m
");}printf("\e[0m\n");}'
eg: http://seriss.com/people/erco/fltk/tmp/ansi-256color.png
Like FLTK, the ANSI xterm-256 color extension uses a color cube
and gray scale to get as much color as possible from a 256 value limit.
There also seems to be a way to access 24bit rgb, though I haven't messed
with it.
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