rofi-i3-cheatsheet — live i3 keybinding cheatsheet that also RUNS the selected action (parsed from i3-msg -t get_config). See https://antlis.is-a.dev/blog/rofi-cheatsheets

rofi-i3-cheatsheet

#!/usr/bin/env bash
#
# Mirrored as a public gist (embedded in the write-up) — if you edit this file,
# update the gist too: https://gist.github.com/antlis/25aaf19b306045f21e0a4afff22cdf81
# Article: https://antlis.is-a.dev/blog/rofi-cheatsheets
#
# rofi-i3-cheatsheet — fullscreen i3 keybinding cheatsheet that ALSO acts:
# selecting an entry performs its binding (exec commands run in a detached
# shell; i3 commands are dispatched via i3-msg).
#
# Source of truth is the LIVE i3 config (i3-msg -t get_config), so it's always
# in sync. Mode bindings (resize / sysmenu) are intentionally omitted — they
# only make sense inside their mode. Approach after budlabs' keybindings-rofi.

# Each row: <runnable command>\t<pretty display>. Tab-splitting keeps the real
# command intact (quotes, $, etc.) without eval-ing generated code.
mapfile -t rows < <(i3-msg -t get_config | awk '
  $1 == "set" {
    name = $2; sub(/^\$/, "", name)
    $1 = $2 = ""; sub(/^[[:space:]]+/, "", $0)
    vars[name] = $0; next
  }
  $1 == "mode" { inmode = 1 }
  $1 == "}"    { inmode = 0 }

  $1 == "bindsym" && !inmode {
    line = $0
    for (k in vars) gsub("[$]" k, vars[k], line)         # resolve $variables
    sub(/^bindsym[[:space:]]+/, "", line)

    key  = line; sub(/[[:space:]].*/, "", key)           # first token = key
    rest = line; sub(/^[^[:space:]]+[[:space:]]+/, "", rest)

    if (rest ~ /^exec([[:space:]]|$)/) {                 # exec -> run directly
      run = rest
      sub(/^exec[[:space:]]+/, "", run)
      sub(/^--no-startup-id[[:space:]]+/, "", run)
      realcmd = run
    } else {                                             # else -> i3-msg
      realcmd = "i3-msg " rest
    }

    pkey = key                                           # pretty key
    gsub(/Mod4/, "Super", pkey); gsub(/Mod1/, "Alt", pkey)
    gsub(/Control/, "Ctrl", pkey); gsub(/\+/, " + ", pkey)

    pcmd = rest                                          # pretty command
    sub(/^exec[[:space:]]+(--no-startup-id[[:space:]]+)?/, "", pcmd)
    gsub(/\/nix\/store\/[^ ]*\/bin\//, "", pcmd)

    # friendly labels for commands that read cryptically in the sheet
    if      (pcmd ~ /i3-dnd-toggle/)        pcmd = "🔕 Toggle notifications (Do Not Disturb)"
    else if (pcmd ~ /dunstctl history-pop/) pcmd = "🔔 Show last notification"
    else if (pcmd ~ /dunstctl close-all/)   pcmd = "🔕 Dismiss all notifications"
    else if (pcmd ~ /ssr-record-toggle/)    pcmd = "⏺ Toggle screen recording (start/stop)"

    printf "%s\t%-34s  %s\n", realcmd, pkey, pcmd
  }
')

(( ${#rows[@]} == 0 )) && exit 0

real=(); disp=()
for r in "${rows[@]}"; do
  real+=( "${r%%$'\t'*}" )
  disp+=( "${r#*$'\t'}" )
done

sel=$(printf '%s\n' "${disp[@]}" | rofi \
  -theme-str 'window { fullscreen: true; } mainbox { padding: 2%; } listview { columns: 2; }' \
  -dmenu -i -format i -p 'i3 keys' \
  -mesg '⌨  i3 keybindings — Enter runs the selected action, Esc to close')

[[ $sel =~ ^[0-9]+$ ]] || exit 0
setsid bash -c "${real[$sel]}" >/dev/null 2>&1 &