Figlet sample viewer (require crc32 from Perl)

figsample

#!/usr/bin/env bash
#
#
#     _______ _____  ______ _______ _______ _______  _____         _______
#     |______   |   |  ____ |______ |_____| |  |  | |_____] |      |______
#     |       __|__ |_____| ______| |     | |  |  | |       |_____ |______
#    
#    
#     ___ ___ ___
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#     _______ _     _ _______      _______ _______ _______ _______ _______ _______ _______
#        |    |_____| |______      |______ |_____| |______    |    |______ |______    |
#        |    |     | |______      |       |     | ______|    |    |______ ______|    |
#    
#     _______ _____  ______        _______ _______      _______  _____  __   _ _______
#     |______   |   |  ____ |      |______    |         |______ |     | | \  |    |
#     |       __|__ |_____| |_____ |______    |         |       |_____| |  \_|    |
#    
#     _______ _____ __   _ ______  _______  ______
#     |______   |   | \  | |     \ |______ |_____/
#     |       __|__ |  \_| |_____/ |______ |    \_
#
#
#
set -Eeuo pipefail

locations=(
  /usr/share/figlet/fonts
  /usr/share/figlet
  /usr/local/share/figlet/fonts
  /usr/local/share/figlet
  /usr/pkg/share/figlet/fonts
  /usr/pkg/share/figlet
  /opt/figlet/fonts
  /opt/figlet
  "$HOME"/.config/figlet/fonts
  "$HOME"/.config/figlet
)

buggy_fonts=(
  C64-fonts/1943____.flf  C64-fonts/4x4_offr.flf  C64-fonts/64f1____.flf  C64-fonts/a_zooloo.flf  C64-fonts/advenger.flf
  C64-fonts/aquaplan.flf  C64-fonts/asc_____.flf  C64-fonts/ascii___.flf  C64-fonts/assalt_m.flf  C64-fonts/asslt__m.flf
  C64-fonts/atc_____.flf  C64-fonts/atc_gran.flf  C64-fonts/b_m__200.flf  C64-fonts/battle_s.flf  C64-fonts/battlesh.flf
  C64-fonts/baz__bil.flf  C64-fonts/beer_pub.flf  C64-fonts/bubble__.flf  C64-fonts/bubble_b.flf  C64-fonts/c1______.flf
  C64-fonts/c2______.flf  C64-fonts/c_ascii_.flf  C64-fonts/c_consen.flf  C64-fonts/caus_in_.flf  C64-fonts/char1___.flf
  C64-fonts/char4___.flf  C64-fonts/charact1.flf  C64-fonts/charact2.flf  C64-fonts/charact3.flf  C64-fonts/charact4.flf
  C64-fonts/charact5.flf  C64-fonts/charact6.flf  C64-fonts/characte.flf  C64-fonts/coil_cop.flf  C64-fonts/com_sen_.flf
  C64-fonts/computer.flf  C64-fonts/convoy__.flf  C64-fonts/d_dragon.flf  C64-fonts/dcs_bfmo.flf  C64-fonts/deep_str.flf
  C64-fonts/demo_m__.flf  C64-fonts/devilish.flf  C64-fonts/druid___.flf  C64-fonts/e__fist_.flf  C64-fonts/ebbs_1__.flf
  C64-fonts/ebbs_2__.flf  C64-fonts/eca_____.flf  C64-fonts/etcrvs__.flf  C64-fonts/f15_____.flf  C64-fonts/faces_of.flf
  C64-fonts/fair_mea.flf  C64-fonts/fairligh.flf  C64-fonts/fantasy_.flf  C64-fonts/fbr12___.flf  C64-fonts/fbr1____.flf
  C64-fonts/fbr2____.flf  C64-fonts/fbr_stri.flf  C64-fonts/fbr_tilt.flf  C64-fonts/finalass.flf  C64-fonts/fireing_.flf
  C64-fonts/flyn_sh.flf   C64-fonts/fp1_____.flf  C64-fonts/fp2_____.flf  C64-fonts/funky_dr.flf  C64-fonts/future_1.flf
  C64-fonts/future_2.flf  C64-fonts/future_3.flf  C64-fonts/future_4.flf  C64-fonts/future_5.flf  C64-fonts/future_6.flf
  C64-fonts/future_7.flf  C64-fonts/future_8.flf  C64-fonts/gauntlet.flf  C64-fonts/ghost_bo.flf  C64-fonts/gothic.flf
  C64-fonts/gothic__.flf  C64-fonts/grand_pr.flf  C64-fonts/green_be.flf  C64-fonts/hades___.flf  C64-fonts/heavy_me.flf
  C64-fonts/heroboti.flf  C64-fonts/high_noo.flf  C64-fonts/hills___.flf  C64-fonts/home_pak.flf  C64-fonts/house_of.flf
  C64-fonts/hypa_bal.flf  C64-fonts/hyper___.flf  C64-fonts/italics_.flf  C64-fonts/joust___.flf  C64-fonts/kgames_i.flf
  C64-fonts/kik_star.flf  C64-fonts/krak_out.flf  C64-fonts/lazy_jon.flf  C64-fonts/letter_w.flf  C64-fonts/letterw3.flf
  C64-fonts/lexible_.flf  C64-fonts/mad_nurs.flf  C64-fonts/magic_ma.flf  C64-fonts/master_o.flf  C64-fonts/mayhem_d.flf
  C64-fonts/mcg_____.flf  C64-fonts/mig_ally.flf  C64-fonts/modern__.flf  C64-fonts/new_asci.flf  C64-fonts/nfi1____.flf
  C64-fonts/notie_ca.flf  C64-fonts/odel_lak.flf  C64-fonts/ok_beer_.flf  C64-fonts/outrun__.flf  C64-fonts/p_s_h_m_.flf
  C64-fonts/p_skateb.flf  C64-fonts/pacos_pe.flf  C64-fonts/panther_.flf  C64-fonts/pawn_ins.flf  C64-fonts/phonix__.flf
  C64-fonts/platoon2.flf  C64-fonts/platoon_.flf  C64-fonts/pod_____.flf  C64-fonts/r2-d2___.flf  C64-fonts/rad_____.flf
  C64-fonts/rad_phan.flf  C64-fonts/rainbow_.flf  C64-fonts/rally_s2.flf  C64-fonts/rally_sp.flf  C64-fonts/rampage_.flf
  C64-fonts/rastan__.flf  C64-fonts/raw_recu.flf  C64-fonts/rci_____.flf  C64-fonts/ripper!_.flf  C64-fonts/road_rai.flf
  C64-fonts/rockbox_.flf  C64-fonts/rok_____.flf  C64-fonts/roman.flf     C64-fonts/roman___.flf  C64-fonts/script__.flf
  C64-fonts/skate_ro.flf  C64-fonts/skateord.flf  C64-fonts/skateroc.flf  C64-fonts/sketch_s.flf  C64-fonts/sm______.flf
  C64-fonts/space_op.flf  C64-fonts/spc_demo.flf  C64-fonts/star_war.flf  C64-fonts/stealth_.flf  C64-fonts/stencil1.flf
  C64-fonts/stencil2.flf  C64-fonts/street_s.flf  C64-fonts/subteran.flf  C64-fonts/super_te.flf  C64-fonts/t__of_ap.flf
  C64-fonts/tav1____.flf  C64-fonts/taxi____.flf  C64-fonts/tec1____.flf  C64-fonts/tec_7000.flf  C64-fonts/tecrvs__.flf
  C64-fonts/ti_pan__.flf  C64-fonts/timesofl.flf  C64-fonts/tomahawk.flf  C64-fonts/top_duck.flf  C64-fonts/trashman.flf
  C64-fonts/triad_st.flf  C64-fonts/ts1_____.flf  C64-fonts/tsm_____.flf  C64-fonts/tsn_base.flf  C64-fonts/type_set.flf
  C64-fonts/ucf_fan_.flf  C64-fonts/ugalympi.flf  C64-fonts/unarmed_.flf  C64-fonts/usa_____.flf  C64-fonts/usa_pq__.flf
  C64-fonts/vortron_.flf  C64-fonts/war_of_w.flf  C64-fonts/yie-ar__.flf  C64-fonts/yie_ar_k.flf  C64-fonts/z-pilot_.flf
  C64-fonts/zig_zag_.flf  C64-fonts/zone7___.flf  bdffonts/5x8.flf        eftichess               eftipiti  
  eftiwall                pyramid                 runic                   smtengwar               twopoint
)

bark() {
  echo "$@"
}

howl() {
  echo >&2 "$@"
}

dog() {
  cat "$@"
}

goto_doggie_heaven() {
  howl "$@"
  exit 1
}

has() {
  command -v "$1" &>/dev/null
}

font_dirs() {
  { bark "$fig_prefix"; default_prefixes; } | sort -u
}

default_prefixes() {
  local f exit_code=1
  for f in "${locations[@]}"; do
    if [ -d "$f" ]; then
      bark "$f"
      exit_code=0
    fi
  done
  return $exit_code
}

format_font_file() {
  if [[ "$1" = "$fig_prefix"* ]]; then
    local relative=${1/$fig_prefix\//}
    if [[ "$relative" = */* ]]; then
      bark "${1/$fig_prefix/\"\$(figlet -I2)\"}"
    else
      bark "${relative/%.flf/}"
    fi
  else
    bark "$1"
  fi
}

is_buggy() {
  local postfix
  for postfix in "${buggy_fonts[@]}"; do
    [[ "$1" = *"$postfix"* ]] && return 0
  done
  return 1
}

shell_escape() {
  local first=1
  for arg in "$@"; do
    if [ $first = 1 ]; then
      first=0
    else
      bark -n ' '
    fi
    case "$arg" in
    *'!'*|*'"'*|*\'*|*'$'*|*'%'*|*' '*|*\\*)
      arg="${arg//\\/\\\\}"
      arg="${arg//\'/\'\\\'\'}"
      bark -n "'$arg'" ;;
    *) bark -n "$arg"
    esac
  done
}

sample_file() {
  local display_file_as file="$1"; shift
  display_file_as="$(format_font_file "$(shell_escape "$file")")"
  ! is_buggy "$display_file_as" || return 0
  
  bark
  bark
  bark
  bark
  figlet -w"$cols" -f "$file" "${args[@]}"
  bark
  bark
  bark -n "figlet -w\$(tput cols) -f $display_file_as "; shell_escape "${args[@]}"
}

locate_fonts() {
  local dir
  font_dirs | while read -r dir; do
    find "$dir" -type f -name '*.flf'
  done | sort
}

show_fonts() {
  local font
  while read -r font; do
    sample_file "$font"
  done
  bark
  bark
}

#### main
sum=a8d07ae1
has crc32 || goto_doggie_heaven "Missing command \`crc32\`"
[ "$(crc32 "$0")" = "$sum" ] || goto_doggie_heaven 'Failed checksum test'
has figlet || goto_doggie_heaven "Missing command \`figlet\`"
cols=$(tput cols)
fig_prefix=$(figlet -I2)

if (( $# )); then
  args=("$@")
else
  args=('Sphinx of black quartz, judge my vow.') # Dogs were too tired
fi

locate_fonts | show_fonts

Found 2 crc32 hash collisions that satisfy this property.

# On an arm64 mac

Valid hash collision for CRC-32 is a8d07ae1
Valid hash collision for CRC-32 is 4520f653
bash ./find-crc32-in-parallel figsample  1577.74s user 3.82s system 901% cpu 2:55.45 total

# On x86_66 linux
Valid hash collision for CRC-32 is a8d07ae1
Valid hash collision for CRC-32 is 4520f653

real	8m55.743s
user	841m18.286s
sys	0m1.257s