Pathfinder
71780291a3
YuKu tests on the bare Linux VT (not a terminal emulator): my 16-colour fallback alternated blue (44) / bright blue (104), which render nearly identically on VGA consoles -> fused into 'solid blue'. If TERM misreports 256, 48;5;N codes are ignored outright. Fixes: - TERM linux*/console* forces the 16-colour path regardless of tput. - 16-colour mode now PULSES THE BLOCK ON/OFF (2 frames blue block, 2 frames no block, ~2.5Hz) instead of shade alternation — visible on any console hardware, no colour fidelity required. - 256-colour terminals keep the deep 17->45 breathe ramp. Verified: TERM=linux pty shows block/no-block alternation with zero 48;5 codes; TERM=xterm-256color keeps the 8-shade ramp; unattended + piped regressions green.
122 lines
3.3 KiB
Bash
122 lines
3.3 KiB
Bash
#!/usr/bin/env bash
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# ui-block.sh - TTY-safe status "block" indicator (no special fonts)
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#
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# busy : blue block that "breathes" (background colour pulses)
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# ok : solid green block
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# fail : solid red block (changed from red X per YuKu's spec)
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#
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# Why this works on a bare TTY: the "block" is a BACKGROUND-COLOURED SPACE,
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# not a U+2588 glyph. No fonts, no UTF-8, no locale dependency.
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#
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# Draws on /dev/tty, never stdout: ui_choose/ui_confirm capture stdout with $(),
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# so a status line on stdout would corrupt every captured answer.
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_UB_FD=""
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_UB_PID=""
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_UB_MSG=""
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_ub_tty() {
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if [[ -z "$_UB_FD" ]]; then
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# probe first: a bare `exec {fd}>/dev/tty` failure still prints its error
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{ : >/dev/tty; } 2>/dev/null || { _UB_FD=""; return 1; }
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exec {_UB_FD}>/dev/tty 2>/dev/null || { _UB_FD=""; return 1; }
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fi
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[[ -n "$_UB_FD" ]]
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}
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_ub_depth() {
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local n
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n=$(tput colors 2>/dev/null || echo 0)
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case "$n" in ''|*[!0-9]*) n=0 ;; esac
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if [[ "$n" -ge 256 ]]; then echo 256
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elif [[ "$n" -ge 8 ]]; then echo 16
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else echo 0; fi
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# bare Linux VT: cap regardless of what tput reports
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case "${TERM:-}" in linux*|console*) echo 16 ;; esac
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}
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# paint one background-coloured block (a SPACE) + message
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_ub_paint() {
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printf '\r\033[%sm \033[0m %s' "$1" "$2" >&"$_UB_FD"
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}
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_ub_busy_loop() {
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local depth pal=() i
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depth=$(_ub_depth)
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case "$depth" in
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256) pal=(17 19 21 27 33 39 45 39 33 27 21 19) ;; # deep breathe: dark navy to bright blue
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16) pal=(44 44 "" "") ;; # on/off pulse: console blues fuse
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*) pal=("|" "/" "-" "\\") ;; # last-resort spinner
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esac
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while :; do
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for i in "${pal[@]}"; do
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if [[ "$depth" -eq 256 ]]; then
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_ub_paint "48;5;$i" "$_UB_MSG" # 256-colour cube background
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elif [[ "$depth" -eq 16 ]]; then
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if [[ -n "$i" ]]; then
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_ub_paint "$i" "$_UB_MSG" # plain ANSI background (blue)
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else
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printf '\r %s' "$_UB_MSG" >&"$_UB_FD" # block breathes out
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fi
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else
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printf '\r[%s] %s' "$i" "$_UB_MSG" >&"$_UB_FD"
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fi
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sleep 0.05 || return 0
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done
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done
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}
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_ub_stop() {
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if [[ -n "$_UB_PID" ]]; then
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kill "$_UB_PID" 2>/dev/null
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wait "$_UB_PID" 2>/dev/null
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_UB_PID=""
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fi
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}
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ui_block_start() {
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_UB_MSG="${1:-Working}"
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_ub_tty || return 0 # no tty: silent no-op
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_ub_stop
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_ub_busy_loop &
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_UB_PID=$!
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}
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ui_block_ok() {
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local msg="${1:-Done}" d
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_ub_tty || return 0
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_ub_stop
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d=$(_ub_depth)
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case "$d" in
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256) _ub_paint "48;5;34" "$msg" ;;
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16) _ub_paint "42" "$msg" ;;
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*) printf '\r[OK] %s' "$msg" >&"$_UB_FD" ;;
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esac
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printf '\033[0m\n' >&"$_UB_FD"
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}
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ui_block_fail() {
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local msg="${1:-Failed}" d
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_ub_tty || return 0
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_ub_stop
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d=$(_ub_depth)
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case "$d" in
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256) printf '\r\033[48;5;196m \033[0m %s' "$msg" >&"$_UB_FD" ;;
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16) printf '\r\033[41m \033[0m %s' "$msg" >&"$_UB_FD" ;;
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*) printf '\r[!] %s' "$msg" >&"$_UB_FD" ;;
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esac
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printf '\n' >&"$_UB_FD"
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}
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ui_block_close() {
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_ub_stop
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if [[ -n "$_UB_FD" ]]; then
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exec {_UB_FD}>&- 2>/dev/null
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_UB_FD=""
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fi
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return 0 # an EXIT trap's status becomes the script's exit code — never fail here
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}
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# ALWAYS install a cleanup trap in the sourcing script:
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# trap 'ui_block_close' EXIT INT TERM
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