--- a/hgext3rd/topic/__init__.py	Sun Oct 01 09:10:48 2017 +0100
+++ b/hgext3rd/topic/__init__.py	Sun Oct 01 00:35:28 2017 +0100
@@ -61,6 +61,7 @@
     topic-mode = warning # print a warning
     topic-mode = enforce # abort the commit (except for merge)
     topic-mode = enforce-all # abort the commit (even for merge)
+    topic-mode = random # use a randomized generated topic (even for merge)
 """
 
 from __future__ import absolute_import
@@ -101,6 +102,7 @@
     stack,
     topicmap,
     discovery,
+    randomname
 )
 
 if util.safehasattr(registrar, 'command'):
@@ -893,6 +895,7 @@
     'warning',
     'enforce',
     'enforce-all',
+    'random',
 ]
 
 def _configtopicmode(ui):
@@ -937,6 +940,9 @@
             ui.warn(_("warning: new draft commit without topic\n"))
             if not ui.quiet:
                 ui.warn(("(%s)") % hint)
+        elif notopic and topicmode == "random":
+            with repo.vfs.open('topic', 'w') as f:
+                f.write(randomname.randomtopicname(ui))
         return orig(ui, repo, *args, **opts)
 
 def committextwrap(orig, repo, ctx, subs, extramsg):

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext3rd/topic/randomname.py	Sun Oct 01 00:35:28 2017 +0100
@@ -0,0 +1,1012 @@
+# __init__.py - topic extension
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+"""random topic generator utils
+"""
+
+import random
+
+animals = [
+    'aardvark',
+    'albatross',
+    'alligator',
+    'alpaca',
+    'ant',
+    'anteater',
+    'antelope',
+    'ape',
+    'armadillo',
+    'ass',
+    'baboon',
+    'badger',
+    'barracuda',
+    'bat',
+    'bear',
+    'beaver',
+    'bee',
+    'beetle',
+    'bison',
+    'boar',
+    'buffalo',
+    'bushbaby',
+    'bustard',
+    'butterfly',
+    'camel',
+    'capuchin',
+    'carabao',
+    'caribou',
+    'cat',
+    'caterpillar',
+    'cattle',
+    'chameleon',
+    'chamois',
+    'cheetah',
+    'chicken',
+    'chimpanzee',
+    'chinchilla',
+    'chipmunk',
+    'chough',
+    'cicada',
+    'clam',
+    'cobra',
+    'cockroach',
+    'cod',
+    'cormorant',
+    'coyote',
+    'crab',
+    'crane',
+    'cricket',
+    'crocodile',
+    'crow',
+    'curlew',
+    'deer',
+    'dinosaur',
+    'dog',
+    'dogfish',
+    'dolphin',
+    'donkey',
+    'dotterel',
+    'dove',
+    'dragon',
+    'dragonfly',
+    'duck',
+    'dugong',
+    'dunlin',
+    'eagle',
+    'echidna',
+    'eel',
+    'eland',
+    'elephant',
+    'elk',
+    'emu',
+    'falcon',
+    'ferret',
+    'finch',
+    'fish',
+    'flamingo',
+    'fly',
+    'fox',
+    'frog',
+    'gaur',
+    'gazelle',
+    'gecko',
+    'gerbil',
+    'giraffe',
+    'gnat',
+    'gnu',
+    'goat',
+    'goldfish',
+    'goose',
+    'gorilla',
+    'goshawk',
+    'grasshopper',
+    'grouse',
+    'guanaco',
+    'guinea',
+    'gull',
+    'hamster',
+    'hare',
+    'hawk',
+    'hedgehog',
+    'heron',
+    'herring',
+    'hippopotamus',
+    'hornet',
+    'horse',
+    'horsecrab',
+    'hound',
+    'hummingbird',
+    'hyena',
+    'hyrax',
+    'ibex',
+    'ibis',
+    'iguana',
+    'impala',
+    'insect',
+    'jackal',
+    'jaguar',
+    'jay',
+    'jellyfish',
+    'kangaroo',
+    'koala',
+    'kouprey',
+    'kudu',
+    'lapwing',
+    'lark',
+    'lemming',
+    'lemur',
+    'leopard',
+    'lion',
+    'lizard',
+    'llama',
+    'lobster',
+    'locust',
+    'loris',
+    'louse',
+    'lynx',
+    'lyrebird',
+    'magpie',
+    'mallard',
+    'mammoth',
+    'manatee',
+    'marten',
+    'meerkat',
+    'mink',
+    'minnow',
+    'mole',
+    'mongoose',
+    'monkey',
+    'moose',
+    'mosquito',
+    'mouse',
+    'mule',
+    'muskrat',
+    'narwhal',
+    'newt',
+    'nightingale',
+    'numbat',
+    'octopus',
+    'okapi',
+    'opossum',
+    'oryx',
+    'ostrich',
+    'otter',
+    'owl',
+    'ox',
+    'oyster',
+    'panda',
+    'panther',
+    'parrot',
+    'partridge',
+    'peacock',
+    'peafowl',
+    'pelican',
+    'penguin',
+    'pheasant',
+    'pig',
+    'pigeon',
+    'platypus',
+    'pony',
+    'porcupine',
+    'porpoise',
+    'prairie',
+    'puffin',
+    'pug',
+    'quagga',
+    'quail',
+    'quelea',
+    'rabbit',
+    'raccoon',
+    'ram',
+    'rat',
+    'raven',
+    'reindeer',
+    'rhea',
+    'rhinoceros',
+    'rook',
+    'ruff',
+    'salamander',
+    'salmon',
+    'sambar',
+    'sandpiper',
+    'sardine',
+    'scorpion',
+    'seahorse',
+    'seal',
+    'serval',
+    'shark',
+    'sheep',
+    'shrew',
+    'shrimp',
+    'skink',
+    'skunk',
+    'snail',
+    'snake',
+    'spider',
+    'squid',
+    'squirrel',
+    'starling',
+    'stinkbug',
+    'stork',
+    'swan',
+    'tapir',
+    'tarsier',
+    'termite',
+    'tern',
+    'tiger',
+    'toad',
+    'trout',
+    'turkey',
+    'turtle',
+    'unicorn',
+    'viper',
+    'vulture',
+    'wallaby',
+    'walrus',
+    'wasp',
+    'weasel',
+    'whale',
+    'wolf',
+    'wolverine',
+    'wombat',
+    'woodchuck',
+    'woodcock',
+    'woodpecker',
+    'worm',
+    'wren',
+    'yak',
+    'zebra',
+    'zorilla'
+]
+
+adjectives = [
+    'abiding',
+    'abject',
+    'ablaze',
+    'able',
+    'aboard',
+    'abounding',
+    'absorbed',
+    'absorbing',
+    'abstracted',
+    'abundant',
+    'acceptable',
+    'accessible',
+    'accurate',
+    'acoustic',
+    'adamant',
+    'adaptable',
+    'adhesive',
+    'adjoining',
+    'adorable',
+    'adventurous',
+    'affable',
+    'affectionate',
+    'agreeable',
+    'alert',
+    'alive',
+    'alluring',
+    'amazing',
+    'ambiguous',
+    'ambitious',
+    'amiable',
+    'amicable',
+    'amused',
+    'amusing',
+    'ancient',
+    'animated',
+    'apricot',
+    'aquatic',
+    'arctic',
+    'arenaceous',
+    'aromatic',
+    'aspiring',
+    'assiduous',
+    'assorted',
+    'astonishing',
+    'attractive',
+    'auspicious',
+    'automatic',
+    'available',
+    'average',
+    'awake',
+    'aware',
+    'awesome',
+    'axiomatic',
+    'bashful',
+    'bawdy',
+    'beautiful',
+    'beefy',
+    'befitting',
+    'beneficial',
+    'benevolent',
+    'bent',
+    'best',
+    'better',
+    'bewildered',
+    'bewitching',
+    'big',
+    'billowy',
+    'bizarre',
+    'black',
+    'blithe',
+    'blue',
+    'blushing',
+    'bouncy',
+    'boundless',
+    'brainy',
+    'brash',
+    'brave',
+    'brawny',
+    'brazen',
+    'breezy',
+    'brief',
+    'bright',
+    'brilliant',
+    'broad',
+    'brown',
+    'bucolic',
+    'bulky',
+    'bumpy',
+    'burgundy',
+    'burly',
+    'bustling',
+    'busy',
+    'calm',
+    'capable',
+    'capricious',
+    'captivating',
+    'carefree',
+    'careful',
+    'caring',
+    'carrot',
+    'ceaseless',
+    'cerise',
+    'certain',
+    'challenging',
+    'changeable',
+    'charming',
+    'cheerful',
+    'chief',
+    'chilly',
+    'chipper',
+    'classy',
+    'clean',
+    'clear',
+    'clever',
+    'cloudy',
+    'coherent',
+    'colorful',
+    'colossal',
+    'comfortable',
+    'common',
+    'communicative',
+    'compassionate',
+    'complete',
+    'complex',
+    'compulsive',
+    'confused',
+    'conscientious',
+    'conscious',
+    'conservative',
+    'considerate',
+    'convivial',
+    'cooing',
+    'cool',
+    'cooperative',
+    'coordinated',
+    'courageous',
+    'courteous',
+    'crazy',
+    'creative',
+    'crispy',
+    'crooked',
+    'crowded',
+    'cuddly',
+    'cultured',
+    'cunning',
+    'curious',
+    'curly',
+    'curved',
+    'curvy',
+    'cut',
+    'cute',
+    'daily',
+    'damp',
+    'dapper',
+    'dashing',
+    'dazzling',
+    'dear',
+    'debonair',
+    'decisive',
+    'decorous',
+    'deep',
+    'defiant',
+    'delicate',
+    'delicious',
+    'delighted',
+    'delightful',
+    'delirious',
+    'descriptive',
+    'detached',
+    'detailed',
+    'determined',
+    'different',
+    'diligent',
+    'diminutive',
+    'diplomatic',
+    'discreet',
+    'distinct',
+    'distinctive',
+    'dramatic',
+    'dry',
+    'dynamic',
+    'dynamite',
+    'eager',
+    'early',
+    'earthy',
+    'easy',
+    'easygoing',
+    'eatable',
+    'economic',
+    'ecstatic',
+    'educated',
+    'efficacious',
+    'efficient',
+    'effortless',
+    'eight',
+    'elastic',
+    'elated',
+    'electric',
+    'elegant',
+    'elfin',
+    'elite',
+    'eminent',
+    'emotional',
+    'enchanted',
+    'enchanting',
+    'encouraging',
+    'endless',
+    'energetic',
+    'enormous',
+    'entertaining',
+    'enthusiastic',
+    'envious',
+    'epicurean',
+    'equable',
+    'equal',
+    'eternal',
+    'ethereal',
+    'evanescent',
+    'even',
+    'excellent',
+    'excited',
+    'exciting',
+    'exclusive',
+    'exotic',
+    'expensive',
+    'exquisite',
+    'extroverted',
+    'exuberant',
+    'exultant',
+    'fabulous',
+    'fair',
+    'faithful',
+    'familiar',
+    'famous',
+    'fancy',
+    'fantastic',
+    'far',
+    'fascinated',
+    'fast',
+    'fearless',
+    'female',
+    'fertile',
+    'festive',
+    'few',
+    'fine',
+    'first',
+    'five',
+    'fixed',
+    'flamboyant',
+    'flashy',
+    'flat',
+    'flawless',
+    'flirtatious',
+    'florid',
+    'flowery',
+    'fluffy',
+    'fluttering',
+    'foamy',
+    'foolish',
+    'foregoing',
+    'fortunate',
+    'four',
+    'frank',
+    'free',
+    'frequent',
+    'fresh',
+    'friendly',
+    'full',
+    'functional',
+    'funny',
+    'furry',
+    'future',
+    'futuristic',
+    'fuzzy',
+    'gabby',
+    'gainful',
+    'garrulous',
+    'general',
+    'generous',
+    'gentle',
+    'giant',
+    'giddy',
+    'gifted',
+    'gigantic',
+    'gilded',
+    'glamorous',
+    'gleaming',
+    'glorious',
+    'glossy',
+    'glowing',
+    'godly',
+    'good',
+    'goofy',
+    'gorgeous',
+    'graceful',
+    'grandiose',
+    'grateful',
+    'gratis',
+    'gray',
+    'great',
+    'green',
+    'gregarious',
+    'grey',
+    'groovy',
+    'guiltless',
+    'gusty',
+    'guttural',
+    'habitual',
+    'half',
+    'hallowed',
+    'halting',
+    'handsome',
+    'happy',
+    'hard',
+    'hardworking',
+    'harmonious',
+    'heady',
+    'healthy',
+    'heavenly',
+    'helpful',
+    'hilarious',
+    'historical',
+    'holistic',
+    'hollow',
+    'honest',
+    'honorable',
+    'hopeful',
+    'hospitable',
+    'hot',
+    'huge',
+    'humorous',
+    'hungry',
+    'hushed',
+    'hypnotic',
+    'illustrious',
+    'imaginary',
+    'imaginative',
+    'immense',
+    'imminent',
+    'impartial',
+    'important',
+    'imported',
+    'impossible',
+    'incandescent',
+    'inconclusive',
+    'incredible',
+    'independent',
+    'industrious',
+    'inexpensive',
+    'innate',
+    'innocent',
+    'inquisitive',
+    'instinctive',
+    'intellectual',
+    'intelligent',
+    'intense',
+    'interesting',
+    'internal',
+    'intuitive',
+    'inventive',
+    'invincible',
+    'jazzy',
+    'jolly',
+    'joyful',
+    'joyous',
+    'judicious',
+    'juicy',
+    'jumpy',
+    'keen',
+    'kind',
+    'kindhearted',
+    'kindly',
+    'knotty',
+    'knowing',
+    'knowledgeable',
+    'known',
+    'laconic',
+    'large',
+    'lavish',
+    'lean',
+    'learned',
+    'left',
+    'legal',
+    'level',
+    'light',
+    'likeable',
+    'literate',
+    'little',
+    'lively',
+    'living',
+    'long',
+    'longing',
+    'loud',
+    'lovely',
+    'loving',
+    'loyal',
+    'lucky',
+    'luminous',
+    'lush',
+    'luxuriant',
+    'luxurious',
+    'lyrical',
+    'magenta',
+    'magical',
+    'magnificent',
+    'majestic',
+    'male',
+    'mammoth',
+    'many',
+    'marvelous',
+    'massive',
+    'material',
+    'mature',
+    'meandering',
+    'meaty',
+    'medical',
+    'mellow',
+    'melodic',
+    'melted',
+    'merciful',
+    'mighty',
+    'miniature',
+    'miniscule',
+    'minor',
+    'minute',
+    'misty',
+    'modern',
+    'modest',
+    'momentous',
+    'motionless',
+    'mountainous',
+    'mute',
+    'mysterious',
+    'narrow',
+    'natural',
+    'near',
+    'neat',
+    'nebulous',
+    'necessary',
+    'neighborly',
+    'new',
+    'next',
+    'nice',
+    'nifty',
+    'nimble',
+    'nine',
+    'nippy',
+    'noiseless',
+    'noisy',
+    'nonchalant',
+    'normal',
+    'numberless',
+    'numerous',
+    'nutritious',
+    'obedient',
+    'observant',
+    'obtainable',
+    'oceanic',
+    'omniscient',
+    'one',
+    'open',
+    'opposite',
+    'optimal',
+    'optimistic',
+    'opulent',
+    'orange',
+    'ordinary',
+    'organic',
+    'outgoing',
+    'outrageous',
+    'outstanding',
+    'oval',
+    'overjoyed',
+    'overt',
+    'palatial',
+    'panoramic',
+    'parallel',
+    'passionate',
+    'past',
+    'pastoral',
+    'patient',
+    'peaceful',
+    'perfect',
+    'periodic',
+    'permissible',
+    'perpetual',
+    'persistent',
+    'petite',
+    'philosophical',
+    'physical',
+    'picturesque',
+    'pink',
+    'pioneering',
+    'piquant',
+    'plausible',
+    'pleasant',
+    'plucky',
+    'poised',
+    'polite',
+    'possible',
+    'powerful',
+    'practical',
+    'precious',
+    'premium',
+    'present',
+    'pretty',
+    'previous',
+    'private',
+    'probable',
+    'productive',
+    'profound',
+    'profuse',
+    'protective',
+    'proud',
+    'psychedelic',
+    'public',
+    'pumped',
+    'purple',
+    'purring',
+    'puzzled',
+    'puzzling',
+    'quaint',
+    'quick',
+    'quicker',
+    'quickest',
+    'quiet',
+    'quirky',
+    'quixotic',
+    'quizzical',
+    'rainy',
+    'rapid',
+    'rare',
+    'rational',
+    'ready',
+    'real',
+    'rebel',
+    'receptive',
+    'red',
+    'reflective',
+    'regular',
+    'relaxed',
+    'reliable',
+    'relieved',
+    'remarkable',
+    'reminiscent',
+    'reserved',
+    'resolute',
+    'resonant',
+    'resourceful',
+    'responsible',
+    'rich',
+    'ridiculous',
+    'right',
+    'rightful',
+    'ripe',
+    'ritzy',
+    'roasted',
+    'robust',
+    'romantic',
+    'roomy',
+    'round',
+    'royal',
+    'ruddy',
+    'rural',
+    'rustic',
+    'sable',
+    'safe',
+    'salty',
+    'same',
+    'satisfying',
+    'savory',
+    'scientific',
+    'scintillating',
+    'scrumptious',
+    'second',
+    'secret',
+    'secretive',
+    'seemly',
+    'selective',
+    'sensible',
+    'separate',
+    'shaggy',
+    'shaky',
+    'shining',
+    'shiny',
+    'short',
+    'shy',
+    'silent',
+    'silky',
+    'silly',
+    'simple',
+    'simplistic',
+    'sincere',
+    'six',
+    'sizzling',
+    'skillful',
+    'sleepy',
+    'slick',
+    'slim',
+    'smart',
+    'smiling',
+    'smooth',
+    'soaring',
+    'sociable',
+    'soft',
+    'solid',
+    'sophisticated',
+    'sparkling',
+    'special',
+    'spectacular',
+    'speedy',
+    'spicy',
+    'spiffy',
+    'spiritual',
+    'splendid',
+    'spooky',
+    'spotless',
+    'spotted',
+    'square',
+    'standing',
+    'statuesque',
+    'steadfast',
+    'steady',
+    'steep',
+    'stimulating',
+    'straight',
+    'straightforward',
+    'striking',
+    'striped',
+    'strong',
+    'stunning',
+    'stupendous',
+    'sturdy',
+    'subsequent',
+    'substantial',
+    'subtle',
+    'successful',
+    'succinct',
+    'sudden',
+    'super',
+    'superb',
+    'supreme',
+    'swanky',
+    'sweet',
+    'swift',
+    'sympathetic',
+    'synonymous',
+    'talented',
+    'tall',
+    'tame',
+    'tan',
+    'tangible',
+    'tangy',
+    'tasteful',
+    'tasty',
+    'telling',
+    'temporary',
+    'tempting',
+    'ten',
+    'tender',
+    'terrific',
+    'tested',
+    'thankful',
+    'therapeutic',
+    'thin',
+    'thinkable',
+    'third',
+    'thoughtful',
+    'three',
+    'thrifty',
+    'tidy',
+    'tiny',
+    'toothsome',
+    'towering',
+    'tranquil',
+    'tremendous',
+    'tricky',
+    'true',
+    'truthful',
+    'two',
+    'typical',
+    'ubiquitous',
+    'ultra',
+    'unassuming',
+    'unbiased',
+    'uncovered',
+    'understanding',
+    'understood',
+    'unequaled',
+    'unique',
+    'unusual',
+    'unwritten',
+    'upbeat',
+    'useful',
+    'utopian',
+    'utter',
+    'uttermost',
+    'valuable',
+    'various',
+    'vast',
+    'verdant',
+    'vermilion',
+    'versatile',
+    'versed',
+    'victorious',
+    'vigorous',
+    'violet',
+    'vivacious',
+    'voiceless',
+    'voluptuous',
+    'wacky',
+    'waiting',
+    'wakeful',
+    'wandering',
+    'warm',
+    'warmhearted',
+    'wealthy',
+    'whimsical',
+    'whispering',
+    'white',
+    'whole',
+    'wholesale',
+    'whopping',
+    'wide',
+    'wiggly',
+    'wild',
+    'willing',
+    'windy',
+    'winsome',
+    'wiry',
+    'wise',
+    'wistful',
+    'witty',
+    'womanly',
+    'wonderful',
+    'workable',
+    'young',
+    'youthful',
+    'yummy',
+    'zany',
+    'zealous',
+    'zesty',
+    'zippy'
+]
+
+def randomtopicname(ui):
+    if ui.configint("devel", "randomseed"):
+        random.seed(ui.configint("devel", "randomseed"))
+    return random.choice(adjectives) + "-" + random.choice(animals)

--- a/tests/test-topicmode.t	Sun Oct 01 09:10:48 2017 +0100
+++ b/tests/test-topicmode.t	Sun Oct 01 00:35:28 2017 +0100
@@ -188,3 +188,33 @@
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     ROOT
   
+Testing the new config knob to use a random topic for untopic commit
+====================================================================
+
+  $ hg init $TESTTMP/test-untopic-random
+  $ cd $TESTTMP/test-untopic-random
+  $ cat <<EOF >> .hg/hgrc
+  > [phases]
+  > publish=false
+  > EOF
+  $ cat <<EOF >> $HGRCPATH
+  > [experimental]
+  > topic-mode = random
+  > EOF
+
+  $ touch ROOT
+  $ hg commit -A -m "ROOT" --config experimental.topic-mode=off
+  adding ROOT
+
+  $ touch A
+  $ hg add A
+  $ hg commit -m "Add A" --config devel.randomseed=42
+  active topic 'panoramic-antelope' grew its first changeset
+
+  $ hg up -r "desc(ROOT)"
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+
+  $ touch B
+  $ hg add B
+  $ hg commit -m "Add B" --config devel.randomseed=128
+  active topic 'various-dove' grew its first changeset