rasterm

Encodes images to iTerm / Kitty / SIXEL (terminal) inline graphics protocols.

Supported Image Encodings

• Kitty
• iTerm2 / WezTerm
• Sixel

TODO

• mintty:
  • detection for iTerm format: https://github.com/mintty/mintty/issues/881
• iTerm2:
  • support: name, width, height, preserveAspectRatio options
• perhaps query tmux directly: TMUX=/tmp/tmux-1000/default,3218,4
• improve terminal identification 19:VT340 ESC[>0c = 19;344:0c https://invisible-island.net/xterm/ctlseqs/ctlseqs-contents.html

TESTING

• test sixel with
  • https://domterm.org/
  • https://www.macterm.net/
• test wez/iterm img with
  • iterm2
  • https://www.macterm.net/

Notes

terminal features matrix

terminal	sixel	iTerm2 format	kitty format
ghostty			Y
iterm2	Y	Y
kitty			Y
rio	Y	Y
mintty	Y	Y
mlterm	Y	Y
putty
rlogin	Y	Y
wezterm	Y	Y
xterm	Y

known responses

CSI 0 c

terminal	response
apple terminal	\x1b[?1;2c
ghostty	\x1b[?62;22c
guake	\x1b[?65;1;9c
iterm2	\x1b[?62;4c
kitty	\x1b[?62;c
rio	\x1b[?62;4;6;22c
mintty	\x1b[?64;1;2;4;6;9;15;21;22;28;29c
mlterm	\x1b[?63;1;2;3;4;7;29c
putty	\x1b[?6c
rlogin	\x1b[?65;1;2;3;4;6;7;8;9;15;18;21;22;29;39;42;44c
st	\x1b[?6c
terminology	\x1b[?64;1;9;15;18;21;22c
vimterm	\x1b[?1;2c
wez	\x1b[?65;4;6;18;22c
xfce	\x1b[?65;1;9c
xterm	\x1b[?63;1;2;4;6;9;15;22c

CSI > 0 c

terminal	response
apple terminal	\x1b[>1;95;0c
ghostty	\x1b[>1;10;0c
guake	\x1b[>65;5402;1c
iterm2	\x1b[>0;95;0c
rio	\x1b[>0;95;0c
kitty	\x1b[>1;4000;19c
mintty	\x1b[>77;30104;0c
mlterm	\x1b[>24;279;0c
putty	\x1b[>0;136;0c
rlogin	\x1b[>65;331;0c
st	NO RESPONSE
vimterm	\x1b[>0;100;0c
wez	\x1b[>0;0;0c
xfce	\x1b[>65;5402;1c
xterm	\x1b[>19;344;0c

identifications

terminal	values
apple terminal	TERM_PROGRAM="Apple_Terminal"
apple terminal	__CFBundleIdentifier="com.apple.Terminal"
ghostty	TERM="xterm-ghostty"
rio	TERM="rio"
guake
iterm2	LC_TERMINAL="iTerm2"
kitty	TERM="xterm-kitty"
mintty	TERM="mintty"
mlterm
putty
rlogin
st
terminology	TERM_PROGRAM=terminology
vimterm	VIM_TERMINAL is set
wez	TERM_PROGRAM="wezterm"
xfce
xterm

opinions

• Sixel is a primitive and wasteful format. Most sixel terminals also support the iTerm2 format--fewer bytes, full color instead of paletted, and no pixel re-processing required. Much better!

go stuff

go tool pprof -http=:8080 ./name.prof
godoc -http=:8099 -goroot="$HOME/go"
go test -v
go mod tidy
https://blog.golang.org/pprof

more reading

• kitty inline images: https://sw.kovidgoyal.net/kitty/graphics-protocol.html
• iterm2 inline images: https://iterm2.com/documentation-images.html
• xterm ctl seqs: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
• sixel ctl seqs: https://vt100.net/docs/vt3xx-gp/chapter14.html
• libsixel: https://saitoha.github.io/libsixel/