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#+build !freestanding
#+build !js
#+private
package terminal
import "base:runtime"
import "core:os"
import "core:strings"
// Reference documentation:
//
// - [[ https://no-color.org/ ]]
// - [[ https://github.com/termstandard/colors ]]
// - [[ https://invisible-island.net/ncurses/terminfo.src.html ]]
get_no_color :: proc() -> bool {
buf: [128]u8
if no_color, err := os.lookup_env(buf[:], "NO_COLOR"); err == nil {
return no_color != ""
}
return false
}
get_environment_color :: proc() -> Color_Depth {
buf: [128]u8
// `COLORTERM` is non-standard but widespread and unambiguous.
if colorterm, err := os.lookup_env(buf[:], "COLORTERM"); err == nil {
// These are the only values that are typically advertised that have
// anything to do with color depth.
if colorterm == "truecolor" || colorterm == "24bit" {
return .True_Color
}
}
if term, err := os.lookup_env(buf[:], "TERM"); err == nil {
if strings.contains(term, "-truecolor") {
return .True_Color
}
if strings.contains(term, "-256color") {
return .Eight_Bit
}
if strings.contains(term, "-16color") {
return .Four_Bit
}
// The `terminfo` database, which is stored in binary on *nix
// platforms, has an undocumented format that is not guaranteed to be
// portable, so beyond this point, we can only make safe assumptions.
//
// This section should only be necessary for terminals that do not
// define any of the previous environment values.
//
// Only a small sampling of some common values are checked here.
switch term {
case "ansi", "konsole", "putty", "rxvt", "rxvt-color", "screen",
"st", "tmux", "vte", "xterm", "xterm-color":
return .Three_Bit
}
}
return .None
}
@(init)
init_terminal :: proc "contextless" () {
_init_terminal()
context = runtime.default_context()
// We respect `NO_COLOR` specifically as a color-disabler but not as a
// blanket ban on any terminal manipulation codes, hence why this comes
// after `_init_terminal` which will allow Windows to enable Virtual
// Terminal Processing for non-color control sequences.
if !get_no_color() {
color_enabled = color_depth > .None
}
}
@(fini)
fini_terminal :: proc "contextless" () {
_fini_terminal()
}
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