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TERMS.md: document block-drawing

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@ -11,24 +11,27 @@ this variable, and your terminal doesn't actually support these sequences,
you're going to have a bad time. you're going to have a bad time.
The following have been established on a Debian Unstable workstation. The following have been established on a Debian Unstable workstation.
`ccc` is the Terminfo can-change-colors capability. `bce` is background
color erase. "Blocks" refers to whether the terminal provides its own
implementation of block-drawing characters, or relies on the font.
| Terminal | `ccc` | `bce` | Recommended environment | Notes | | Terminal | `ccc` | `bce` | Blocks | Recommended environment | Notes |
| -------- | ----- | ----- | ----- | ----- | | -------- | ----- | ----- | ----- | ----- |
| Linux console | ✔ | ✔ |`TERM=linux` `COLORTERM=24bit` | 8 (512 glyph fonts) or 16 (256 glyph fonts) colors max, but RGB values are downsampled to a 256-index palette. See below. | | Linux console | ✔ | ✔ | N/A | `TERM=linux` `COLORTERM=24bit` | 8 (512 glyph fonts) or 16 (256 glyph fonts) colors max, but RGB values are downsampled to a 256-index palette. See below. |
| FBterm | | ? |`TERM=fbterm` | 256 colors, no RGB color. | | FBterm | | ? | ? | `TERM=fbterm` | 256 colors, no RGB color. |
| kmscon | | ? | `TERM=xterm-256color` | No RGB color AFAICT, nor any distinct terminfo entry. | | kmscon | | ? | ? | `TERM=xterm-256color` | No RGB color AFAICT, nor any distinct terminfo entry. |
| XTerm | | ✔ |`TERM=xterm-256color` `COLORTERM=24bit` | See note about DirectColor. Must configure with `--enable-direct-color`. `TERM=xterm-direct` seems to have the undesirable effect of mapping low RGB values to a palette; I don't yet understand this well. The problem is not seen with the specified configuration. Sixel support when built with `--enable-sixel-graphics` and run in vt340 mode. | | XTerm | | ✔ |🗴|`TERM=xterm-256color` `COLORTERM=24bit` | See note about DirectColor. Must configure with `--enable-direct-color`. `TERM=xterm-direct` seems to have the undesirable effect of mapping low RGB values to a palette; I don't yet understand this well. The problem is not seen with the specified configuration. Sixel support when built with `--enable-sixel-graphics` and run in vt340 mode. |
| XFCE4 Terminal | ✔ | ✔ |`TERM=xfce` `COLORTERM=24bit` | No `xfce-direct` variant exists. | | XFCE4 Terminal | ✔ | ✔ |? |`TERM=xfce` `COLORTERM=24bit` | No `xfce-direct` variant exists. |
| Gnome Terminal | 🗴 | ✔ |`TERM=gnome` `COLORTERM=24bit` | `ccc` support *is* available when run with `vte-256color`. | | Gnome Terminal | 🗴 | ✔ |? |`TERM=gnome` `COLORTERM=24bit` | `ccc` support *is* available when run with `vte-256color`. |
| Konsole | 🗴 | ✔ |`TERM=konsole-direct` | | | Konsole | 🗴 | ✔ |? | `TERM=konsole-direct` | |
| Alacritty | ✔ | ✔ |`TERM=alacritty` `COLORTERM=24bit` | | | Alacritty | ✔ | ✔ |🗴|`TERM=alacritty` `COLORTERM=24bit` | |
| Kitty | ✔ | 🗴 |`TERM=kitty-direct` | | | Kitty | ✔ | 🗴 |✔ |`TERM=xterm-kitty` | |
| Sakura | ✔ | ✔ |`TERM=vte-256color` `COLORTERM=24bit` | No terminfo entry? | | Sakura | ✔ | ✔ |? |`TERM=vte-256color` `COLORTERM=24bit` | No terminfo entry? |
| mlterm | 🗴 | ✔ |`TERM=mlterm-256color` | Do not set `COLORTERM`. `mlterm-direct` gives strange results. | | mlterm | 🗴 | ✔ |? |`TERM=mlterm-256color` | Do not set `COLORTERM`. `mlterm-direct` gives strange results. |
| st | ✔ | ✔ |`TERM=st-256color` `COLORTERM=24bit` | | | st | ✔ | ✔ |? |`TERM=st-256color` `COLORTERM=24bit` | |
| wterm | | | | | | wterm | | | | | |
| GNU Screen | 🗴 | ✔ |`TERM=screen.OLDTERM` | Must be compiled with `--enable-256color`. `TERM` should typically be `screen.` suffixed by the appropriate `TERM` value for the true connected terminal, e.g. `screen.vte-256color`. See below. | | GNU Screen | 🗴 | ✔ | |`TERM=screen.OLDTERM` | Must be compiled with `--enable-256color`. `TERM` should typically be `screen.` suffixed by the appropriate `TERM` value for the true connected terminal, e.g. `screen.vte-256color`. See below. |
| tmux | | | | | | tmux | | | | | |
Note that `xfce4-terminal`, `gnome-terminal`, etc. are essentially skinning Note that `xfce4-terminal`, `gnome-terminal`, etc. are essentially skinning
atop the common VTE ("Virtual TErminal") library. atop the common VTE ("Virtual TErminal") library.