term: fix tmux, alacritty info

See also d0902a8 (switch from plink to zuo, 2024-10-18): after that
switch led to [1], there have continued to be problems (such as htop not
showing colors because the `pairs` attribute was interpreted as `0`).

While upgrading to macOS Sonoma or beyond should come with new curses
that makes things work again ([2], [3]), at the moment my current
hardware is stuck on Monterey (and I don't relish trying OpenCore Legacy
Patcher [4] right now).

Instead, try _yet another hack_ [3]: decompile the tmux-256color entry
with a modern curses, patch it, and recompile with the system curses.
This appears to be completely working for tmux-256color, though does
require the interesting workaround of using TERMINFO_DIRS (see `man infocmp`
and compare with `man $(brew --prefix ncurses)/share/man/man1/infocmp.1m`).
The post [3] also explains most of the details, but comes with another
warning [5].

Finally, I noticed that somewhere in the process my alacritty terminfo
had broken: `infocmp -x` produces similarly odd byte sequence [6] that
turns on strikethrough (part of a `| xxd` dump):

    000000a0: 206e 7063 2c20 7865 6e6c 2c20 1b5b 396d   npc, xenl, .[9m

The primary effect seems to be that italics were disabled. I can't find
a way to compile the GitHub-provided entry that doesn't have this bug,
but I can fix the italic sequences in Vim.

[1]: https://superuser.com/a/1859217/990010
[2]: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/t/tmux.rb#L59C6-L59C62
[3]: https://gpanders.com/blog/the-definitive-guide-to-using-tmux-256color-on-macos/
[4]: https://dortania.github.io/OpenCore-Legacy-Patcher/
[5]: tmux/tmux#2262 (comment)
[6]: https://superuser.com/q/1858313/990010

links/vim/vimrc

@@ -512,6 +512,11 @@ if ! exists('g:colors_name')
     endif
     let s:italic_default = 1
   elseif $TERM ==# 'alacritty'
+    " for some reason, the alacritty profile isn't correct on my machine at the
+    " moment; probably because I'm stuck on macOS Monterey before the curses
+    " upgrade in Sonoma.
+    let &t_ZH = "\e[3m"
+    let &t_ZR = "\e[23m"
     let s:italic_default = 1
   endif
 

links/zshenv

@@ -29,6 +29,8 @@ export RIPGREP_CONFIG_PATH=~/.rgrc
 
 export RACO_TEST_ARGS='-j $$(nproc)'
 
+export TERMINFO_DIRS=$TERMINFO_DIRS:$HOME/.local/share/terminfo
+
 # personal vars {{{
 
 # OS test

main.zuo

@@ -35,10 +35,10 @@
   (define brew-url
     "https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh")
 
+  (define terminfo
+    (at-home ".local" "share" "terminfo"))
   (define tmux-terminfo
-    (at-home ".terminfo" "74" "tmux-256color"))
-  (define xterm-terminfo
-    (at-home ".terminfo" "78" "xterm-256color"))
+    (build-path terminfo "74" "tmux-256color"))
 
   (define targets
     `([:target default ()
@@ -61,14 +61,16 @@
       [:target ,brewfile ()
                ,(lambda (dest token)
                   (shell/wait "brew bundle dump --force" (~a "--file=" (string->shell dest))))]
-      [:target (,tmux-terminfo ,xterm-terminfo) ()
+      [:target ,tmux-terminfo ()
                ,(lambda (dest token)
+                  (rm* dest)
                   (shell/wait
-                   "curl -LO https://invisible-island.net/datafiles/current/terminfo.src.gz &&"
-                   "gunzip terminfo.src.gz &&"
-                   "tic -xe tmux-256color terminfo.src &&"
-                   "tic -xe xterm-256color terminfo.src &&"
-                   "rm terminfo.src"))]
+                   "zsh -c"
+                   (string->shell
+                    (build-shell
+                     `("/usr/bin/tic -x -o" ,(string->shell terminfo)
+                       "=($(brew --prefix ncurses)/bin/infocmp -x tmux-256color |"
+                       "  sed -E 's/pairs#(0x10000|65536)/pairs#32767/')")))))]
       [:target dirs ()
                ,(lambda (token)
                   (for-each mkdir-p dirs)