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#!/bin/bash
# v0.0.1
# NOTE according to wiktionary "emoji"" can be used as plural too ;)
# https://en.wiktionary.org/w/index.php?title=emoji&oldid=42579068
# List from https://www.webpagefx.com/tools/emoji-cheat-sheet/
valid_emoji="bowtie|smile|simple_smile|laughing|blush|smiley|relaxed|smirk|heart_eyes|kissing_heart|kissing_closed_eyes|flushed|relieved|satisfied|grin|wink|stuck_out_tongue_winking_eye|stuck_out_tongue_closed_eyes|grinning|kissing|kissing_smiling_eyes|stuck_out_tongue|sleeping|worried|frowning|anguished|open_mouth|grimacing|confused|hushed|expressionless|unamused|sweat_smile|sweat|disappointed_relieved|weary|pensive|disappointed|confounded|fearful|cold_sweat|persevere|cry|sob|joy|astonished|scream|neckbeard|tired_face|angry|rage|triumph|sleepy|yum|mask|sunglasses|dizzy_face|imp|smiling_imp|neutral_face|no_mouth|innocent|alien|yellow_heart|blue_heart|purple_heart|heart|green_heart|broken_heart|heartbeat|heartpulse|two_hearts|revolving_hearts|cupid|sparkling_heart|sparkles|star|star2|dizzy|boom|collision|anger|exclamation|question|grey_exclamation|grey_question|zzz|dash|sweat_drops|notes|musical_note|fire|hankey|poop|shit|\\+1|thumbsup|\\-1|thumbsdown|ok_hand|punch|facepunch|fist|v|wave|hand|raised_hand|open_hands|point_up|point_down|point_left|point_right|raised_hands|pray|point_up_2|clap|muscle|metal|fu|runner|running|couple|family|two_men_holding_hands|two_women_holding_hands|dancer|dancers|ok_woman|no_good|information_desk_person|raising_hand|bride_with_veil|person_with_pouting_face|person_frowning|bow|couplekiss|couple_with_heart|massage|haircut|nail_care|boy|girl|woman|man|baby|older_woman|older_man|person_with_blond_hair|man_with_gua_pi_mao|man_with_turban|construction_worker|cop|angel|princess|smiley_cat|smile_cat|heart_eyes_cat|kissing_cat|smirk_cat|scream_cat|crying_cat_face|joy_cat|pouting_cat|japanese_ogre|japanese_goblin|see_no_evil|hear_no_evil|speak_no_evil|guardsman|skull|feet|lips|kiss|droplet|ear|eyes|nose|tongue|love_letter|bust_in_silhouette|busts_in_silhouette|speech_balloon|thought_balloon|feelsgood|finnadie|goberserk|godmode|hurtrealbad|rage1|rage2|rage3|rage4|suspect|trollface|sunny|umbrella|cloud|snowflake|snowman|zap|cyclone|foggy|ocean|cat|dog|mouse|hamster|rabbit|wolf|frog|tiger|koala|bear|pig|pig_nose|cow|boar|monkey_face|monkey|horse|racehorse|camel|sheep|elephant|panda_face|snake|bird|baby_chick|hatched_chick|hatching_chick|chicken|penguin|turtle|bug|honeybee|ant|beetle|snail|octopus|tropical_fish|fish|whale|whale2|dolphin|cow2|ram|rat|water_buffalo|tiger2|rabbit2|dragon|goat|rooster|dog2|pig2|mouse2|ox|dragon_face|blowfish|crocodile|dromedary_camel|leopard|cat2|poodle|paw_prints|bouquet|cherry_blossom|tulip|four_leaf_clover|rose|sunflower|hibiscus|maple_leaf|leaves|fallen_leaf|herb|mushroom|cactus|palm_tree|evergreen_tree|deciduous_tree|chestnut|seedling|blossom|ear_of_rice|shell|globe_with_meridians|sun_with_face|full_moon_with_face|new_moon_with_face|new_moon|waxing_crescent_moon|first_quarter_moon|waxing_gibbous_moon|full_moon|waning_gibbous_moon|last_quarter_moon|waning_crescent_moon|last_quarter_moon_with_face|first_quarter_moon_with_face|crescent_moon|earth_africa|earth_americas|earth_asia|volcano|milky_way|partly_sunny|octocat|squirrel|bamboo|gift_heart|dolls|school_satchel|mortar_board|flags|fireworks|sparkler|wind_chime|rice_scene|jack_o_lantern|ghost|santa|christmas_tree|gift|bell|no_bell|tanabata_tree|tada|confetti_ball|balloon|crystal_ball|cd|dvd|floppy_disk|camera|video_camera|movie_camera|computer|tv|iphone|phone|telephone|telephone_receiver|pager|fax|minidisc|vhs|sound|speaker|mute|loudspeaker|mega|hourglass|hourglass_flowing_sand|alarm_clock|watch|radio|satellite|loop|mag|mag_right|unlock|lock|lock_with_ink_pen|closed_lock_with_key|key|bulb|flashlight|high_brightness|low_brightness|electric_plug|battery|calling|email|mailbox|postbox|bath|bathtub|shower|toilet|wrench|nut_and_bolt|hammer|seat|moneybag|yen|dollar|pound|euro|credit_card|money_with_wings|e\\-mail|inbox_tray|outbox_tray|envelope|incoming_envelope|postal_horn|mailbox_closed|mailbox_with_mail|mailbox_with_no_mail|package|door|smoking|bomb|gun|hocho|pill|syringe|page_facing_up|page_with_curl|bookmark_tabs|bar_chart|chart_with_upwards_trend|chart_with_downwards_trend|scroll|clipboard|calendar|date|card_index|file_folder|open_file_folder|scissors|pushpin|paperclip|black_nib|pencil2|straight_ruler|triangular_ruler|closed_book|green_book|blue_book|orange_book|notebook|notebook_with_decorative_cover|ledger|books|bookmark|name_badge|microscope|telescope|newspaper|football|basketball|soccer|baseball|tennis|8ball|rugby_football|bowling|golf|mountain_bicyclist|bicyclist|horse_racing|snowboarder|swimmer|surfer|ski|spades|hearts|clubs|diamonds|gem|ring|trophy|musical_score|musical_keyboard|violin|space_invader|video_game|black_joker|flower_playing_cards|game_die|dart|mahjong|clapper|memo|pencil|book|art|microphone|headphones|trumpet|saxophone|guitar|shoe|sandal|high_heel|lipstick|boot|shirt|tshirt|necktie|womans_clothes|dress|running_shirt_with_sash|jeans|kimono|bikini|ribbon|tophat|crown|womans_hat|mans_shoe|closed_umbrella|briefcase|handbag|pouch|purse|eyeglasses|fishing_pole_and_fish|coffee|tea|sake|baby_bottle|beer|beers|cocktail|tropical_drink|wine_glass|fork_and_knife|pizza|hamburger|fries|poultry_leg|meat_on_bone|spaghetti|curry|fried_shrimp|bento|sushi|fish_cake|rice_ball|rice_cracker|rice|ramen|stew|oden|dango|egg|bread|doughnut|custard|icecream|ice_cream|shaved_ice|birthday|cake|cookie|chocolate_bar|candy|lollipop|honey_pot|apple|green_apple|tangerine|lemon|cherries|grapes|watermelon|strawberry|peach|melon|banana|pear|pineapple|sweet_potato|eggplant|tomato|corn|house|house_with_garden|school|office|post_office|hospital|bank|convenience_store|love_hotel|hotel|wedding|church|department_store|european_post_office|city_sunrise|city_sunset|japanese_castle|european_castle|tent|factory|tokyo_tower|japan|mount_fuji|sunrise_over_mountains|sunrise|stars|statue_of_liberty|bridge_at_night|carousel_horse|rainbow|ferris_wheel|fountain|roller_coaster|ship|speedboat|boat|sailboat|rowboat|anchor|rocket|airplane|helicopter|steam_locomotive|tram|mountain_railway|bike|aerial_tramway|suspension_railway|mountain_cableway|tractor|blue_car|oncoming_automobile|car|red_car|taxi|oncoming_taxi|articulated_lorry|bus|oncoming_bus|rotating_light|police_car|oncoming_police_car|fire_engine|ambulance|minibus|truck|train|station|train2|bullettrain_front|bullettrain_side|light_rail|monorail|railway_car|trolleybus|ticket|fuelpump|vertical_traffic_light|traffic_light|warning|construction|beginner|atm|slot_machine|busstop|barber|hotsprings|checkered_flag|crossed_flags|izakaya_lantern|moyai|circus_tent|performing_arts|round_pushpin|triangular_flag_on_post|jp|kr|cn|us|fr|es|it|ru|gb|uk|de|one|two|three|four|five|six|seven|eight|nine|keycap_ten|1234|zero|hash|symbols|arrow_backward|arrow_down|arrow_forward|arrow_left|capital_abcd|abcd|abc|arrow_lower_left|arrow_lower_right|arrow_right|arrow_up|arrow_upper_left|arrow_upper_right|arrow_double_down|arrow_double_up|arrow_down_small|arrow_heading_down|arrow_heading_up|leftwards_arrow_with_hook|arrow_right_hook|left_right_arrow|arrow_up_down|arrow_up_small|arrows_clockwise|arrows_counterclockwise|rewind|fast_forward|information_source|ok|twisted_rightwards_arrows|repeat|repeat_one|new|top|up|cool|free|ng|cinema|koko|signal_strength|u5272|u5408|u55b6|u6307|u6708|u6709|u6e80|u7121|u7533|u7a7a|u7981|sa|restroom|mens|womens|baby_symbol|no_smoking|parking|wheelchair|metro|baggage_claim|accept|wc|potable_water|put_litter_in_its_place|secret|congratulations|m|passport_control|left_luggage|customs|ideograph_advantage|cl|sos|id|no_entry_sign|underage|no_mobile_phones|do_not_litter|non\\-potable_water|no_bicycles|no_pedestrians|children_crossing|no_entry|eight_spoked_asterisk|sparkle|eight_pointed_black_star|heart_decoration|vs|vibration_mode|mobile_phone_off|chart|currency_exchange|aries|taurus|gemini|cancer|leo|virgo|libra|scorpius|sagittarius|capricorn|aquarius|pisces|ophiuchus|six_pointed_star|negative_squared_cross_mark|a|b|ab|o2|diamond_shape_with_a_dot_inside|recycle|end|back|on|soon|clock1|clock130|clock10|clock1030|clock11|clock1130|clock12|clock1230|clock2|clock230|clock3|clock330|clock4|clock430|clock5|clock530|clock6|clock630|clock7|clock730|clock8|clock830|clock9|clock930|heavy_dollar_sign|copyright|registered|tm|x|heavy_exclamation_mark|bangbang|interrobang|o|heavy_multiplication_x|heavy_plus_sign|heavy_minus_sign|heavy_division_sign|white_flower|100|heavy_check_mark|ballot_box_with_check|radio_button|link|curly_loop|wavy_dash|part_alternation_mark|trident|black_small_square|white_small_square|black_medium_small_square|white_medium_small_square|black_medium_square|white_medium_square|black_large_square|white_large_square|white_check_mark|black_square_button|white_square_button|black_circle|white_circle|red_circle|large_blue_circle|large_blue_diamond|large_orange_diamond|small_blue_diamond|small_orange_diamond|small_red_triangle|small_red_triangle_down|shipit"
# collect every sequence of consecutive non-space characters that is surrounded by colons and not a valid emoji from the commit message
invalid_emoji="$(perl -ne "push(@matches, \$1) while (\$_ =~ /(\:(?!(?:$valid_emoji)\:)[^ :]+\:)/g); print join('', @matches);" < "$1")"
# print each line of the commit message if it doesn't start with a valid emoji
start_matches="$(perl -ne "print unless /^\:(?:$valid_emoji)\: /g" < "$1")"
# format the list of invalid emoji: remove the colons, duplicates and join them to a comma-and-quote-separated string
formatted_invalid_emoji="$(echo "$invalid_emoji" | tr -s ":" " " | tr -s " " "\n" | sort | uniq | sed -e '/^\s*$/d' | perl -pe 's/\n/", "/ unless eof' )"
if [[ ! -z "$invalid_emoji" ]]; then
echo "Commit message contains invalid emoji \"$formatted_invalid_emoji\"" >&2
exit 1
fi
if [[ -n "$start_matches" ]]; then
echo "Commit message must start with emoji followed by space" >&2
exit 2
fi
# good to go!
exit 0