256-Colo(u?)r support

[shabble]

Currently, Irssi only supports 8 colours (16 if you count bright ones). Buidling Ncurses with --enable-ext-colors allows for
256 foreground and background colors (assumign a supporting terminal), which would allow for much more configurability in themes, etc.

Notes from a prior conversion:
<+ferret> in src/fe-text/term-terminfo.c:set_term_colors() the colour argument is an integer with lowest 4 bits for the foreground color and 5th-8th bits for the background colour <+ferret> that would need to be changed to 1-8 and 9-16 <+ferret> or split into two vars (I mean, come on? Why compress data that way?) <+ferret> Ahh... the upper 8 bits are also used for things like blink <+ferret> So you would definitely need to either make that var bigger or add another one <+ferret> Other than that the code doesn't look too hard to implement <+shabble> think of all the extra %num special vars you'd need! <+ferret> The money shot is in src/fe-text/terminfo-core.c, where you change terminfo_setup_colors to respect 256 color term environment and config option, setting term->TI_colors to 256 <+ferret> It creates an array of strings of either 8 or 256 colour entries, either returned from the setaf tput function or force generated as \e[%dm <+ferret> As a refinement you'd probably want to come up with a way of mapping the 256 entries to the basic 8 colours in the case the terminal doesn't support it. Code for that can be ripped from screen :D <+ferret> Yeah, there is that... but the formats parsing isn't particularly critical anyway, and you can make it greedy without causing too many problems. Just create a new %X where X is a letter that has two following bytes which are interpreted as hex in the range 0..255. Another letter for background colour. <+shabble> that could work <+shabble> although I suspect many things will assume % is only followed by a single char <+ferret> Let's find out. <+shabble> looks like fe-common/core/themes.c where it gets processed <+ferret> Nah <+ferret> There's no big switch statement in there <+ferret> There should be one :> <+ferret> It's in formats.c in the same directory <+shabble> ah, formats.c

[richo]

While you're at it, you only have 8 color choices for backgrounds in statusbars (no bright/dull distinction)

Post 256 color support would all colors just be RGB values, with optional shorthand like what's in place?

[shabble]

My understanding so far is that you can have 256 colours for both fore- and backgrounds, givng you 65k colour pairs.

My current thinking is to keep the existing % colour escapes, and add something like %xddd and %Xddd for foreground and background colours respectively. I have some demo code (from http://www.frexx.de/xterm-256-notes/ ) which demonstrates using NCurses to produce 32k colour pairs, plus a bold/underline, etc.

That's the idea, anyway. Actual implementation may change how it has to work.

[pd0mz]

Bump! C'mon irssi team, it's 2013 👍

[ekix]

I would love to see 256 color support for Irssi.

[ailin-nemui]

ahf/irssi#4