Shallow Thoughts : tags : xchat

Akkana's Musings on Open Source Computing, Science, and Nature.

Sat, 15 Jun 2013

Autocompleting xchat channel log filenames in zsh

Sometimes zsh is a little too smart for its own good.

Something I do surprisingly often is to complete the filenames for my local channel logs in xchat. Xchat gives its logs crazy filenames like /home/akkana/.xchat2/xchatlogs/FreeNode-#ubuntu-us-ca.log. They're hard to autocomplete -- I have to type something like: ~/.xc<tab>xc<tab>l<tab>Fr<tab>\#ub<tab>us<tab> Even with autocompletion, that's a lot of typing!

Bug zsh makes it even worse: I have to put that backslash in front of the hash, \#, or else zsh will see it either as a comment (unless I unsetopt interactivecomments, in which case I can't paste functions from my zshrc when I'm testing them); or as an extended regular expression (unless I unsetopt extendedglob). I don't want to unset either of those options: I use both of them.

Tonight I was fiddling with something else related to extendedglob, and was moved to figure out another solution to the xchat completion problem. Why not get zsh's smart zle editor to insert most of that annoying, not easily autocompletable string for me?

The easy solution was to bind it to a function key. I picked F8 for testing, and figured out its escape sequence by typing echo , then Ctrl-V, then hitting F8. It turns out to insert <ESC>[20~. So I made a binding:

bindkey -s '\e[20~' '~/.xchat2/xchatlogs/ \\\#^B^B^B'

When I press F8, that inserts the following string:

~/.xchat2/xchatlogs/ \#
                    ↑ (cursor ends up here)
... moving the cursor back three characters, so it's right before the space. The space is there so I can autocomplete the server name by typing something like Fr<TAB> for FreeNode. Then I delete the space (Ctrl-D), go to the end of the line (Ctrl-E), and start typing my channel name, like ubu<TAB>us<TAB>. I don't have to worry about typing the rest of the path, or the escaped hash sign.

That's pretty cool. But I wished I could bind it to a character sequence, like maybe .xc, rather than using a function key. (I could use my Crikey program to do that at the X level, but that's cheating; I wanted to do it within zsh.) You can't just use bindkey -s '.xch' '~/.xchat2/xchatlogs/ \\\#^B^B^B' because it's recursive: as soon as zsh inserts the ~/.xc part, that expands too, and you end up with ~/~/.xchat2/xchatlogs/hat2/xchatlogs/ \# \#.

The solution, though it's a lot more lines, is to use the special variables LBUFFER and RBUFFER. LBUFFER is everything left of the cursor position, and RBUFFER everything right of it. So I define a function to set those, then set a zle "widget" to that function, then finally bindkey to that widget:

function autoxchat()
zle -N autoxchat
bindkey ".xc" autoxchat

Pretty cool! The only down side: now that I've gone this far in zle bindings, I'm probably an addict and will waste a lot more time tweaking them.

Tags: , ,
[ 20:31 Jun 15, 2013    More linux/cmdline | permalink to this entry | comments ]

Wed, 26 Sep 2012

Writing xchat scripts in Python (to play sound alerts)

I use xchat as my IRC client. Mostly I like it, but its sound alerts aren't quite as configurable as I'd like. I have a few channels, like my Bitlbee Twitter feed, where I want a much more subtle alert, or no alert at all. And I want an easy way of turning sounds on and off, in case I get busy with something and need to minimize distractions.

Years ago I grabbed a perl xchat plug-in called "Smet's NickSound" that did something close to what I wanted. I've hacked a few things into it. But every time I try to customize it any further, I'm hit with the pain of write-only Perl. I've written Perl scripts, honest. But I always have a really hard time reading anyone else's Perl code and figuring out what it's doing. When I dove in again recently to try to figure out why I was getting so many alerts when first starting up xchat, I finally decided: learning how to write a Python xchat script couldn't be any harder than reverse engineering a Perl one.

First, of course, I looked for an existing nick sound Python script ... and totally struck out. In fact, mostly I struck out on finding any xchat Python scripts at all. I know there are Python bindings for xchat, because there's documentation for them. But sample plug-ins? Nope. For some reason, nobody's writing xchat plug-ins in Python.

I eventually found two minimal examples: this very simple example and the more elaborate utf8decoder. I was able to put them together and cobble up a working nick sound plug-in. It's easy once you have an example to work from to help you figure out the event hook arguments.

So here's my own little example, which may help the next person trying to learn xchat Python scripting: on github.

Tags: , , ,
[ 21:13 Sep 26, 2012    More programming | permalink to this entry | comments ]

Mon, 14 Feb 2011

Starting a line with a slash in xchat

As most veteran IRC users know, IRC commands generally start with a slash at the beginning of a line. For instance, you say
/join #channel
to join a new channel, or
/me waves to everyone
to send "*akk waves to everyone" to the channel.

Great, but what if I want to start a line with a slash?

On some IRC clients, you can type two slashes, e.g.

/ /me tries
but on xchat that doesn't work -- it just complains "unknown command".

On xchat, what you need is /say:

/say /me succeeds!

Silly little tip, but I know I'll forget it if I don't record it ... and I bet I'm not the only xchat user wondering how to do this.

Update: it turns out that sometimes in xchat you can use a double slash with no spaces:
//me tries
which is the obvious thing to try, but it hasn't always worked reliably for me. Try it ... but you can fall back on /say if // doesn't work.

Tags: , ,
[ 20:55 Feb 14, 2011    More linux | permalink to this entry | comments ]

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