diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/Pipfile b/Pipfile
deleted file mode 100644
index 5ad7c44..0000000
--- a/Pipfile
+++ /dev/null
@@ -1,26 +0,0 @@
-[[source]]
-name = "pypi"
-url = "https://pypi.org/simple"
-verify_ssl = true
-
-[dev-packages]
-
-[packages]
-beautifulsoup4 = "*"
-bencode.py = "4"
-ebooklib = "*"
-flask = "*"
-matplotlib = "*"
-numpy = "*"
-pandas = "*"
-pillow = "*"
-python-libxdo = "*"
-pyyaml = "*"
-requests = "*"
-tqdm = "*"
-
-[requires]
-python_version = "3.8"
-
-[pipenv]
-allow_prereleases = true
diff --git a/Pipfile.lock b/Pipfile.lock
deleted file mode 100644
index ee9edef..0000000
--- a/Pipfile.lock
+++ /dev/null
@@ -1,390 +0,0 @@
-{
-    "_meta": {
-        "hash": {
-            "sha256": "4dc1f219fe0e75649026fbb1117619d56ef330f6e993237cf1897278399bdb83"
-        },
-        "pipfile-spec": 6,
-        "requires": {
-            "python_version": "3.8"
-        },
-        "sources": [
-            {
-                "name": "pypi",
-                "url": "https://pypi.org/simple",
-                "verify_ssl": true
-            }
-        ]
-    },
-    "default": {
-        "beautifulsoup4": {
-            "hashes": [
-                "sha256:73cc4d115b96f79c7d77c1c7f7a0a8d4c57860d1041df407dd1aae7f07a77fd7",
-                "sha256:a6237df3c32ccfaee4fd201c8f5f9d9df619b93121d01353a64a73ce8c6ef9a8",
-                "sha256:e718f2342e2e099b640a34ab782407b7b676f47ee272d6739e60b8ea23829f2c"
-            ],
-            "index": "pypi",
-            "version": "==4.9.1"
-        },
-        "bencode": {
-            "hashes": [
-                "sha256:0301c2202233a3f274c940702bac7bd02d5d053b8bf9502b085156270e30be9b"
-            ],
-            "index": "pypi",
-            "version": "==1.0"
-        },
-        "certifi": {
-            "hashes": [
-                "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3",
-                "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"
-            ],
-            "version": "==2020.6.20"
-        },
-        "chardet": {
-            "hashes": [
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
-            ],
-            "version": "==3.0.4"
-        },
-        "click": {
-            "hashes": [
-                "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
-                "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
-            ],
-            "version": "==7.1.2"
-        },
-        "cycler": {
-            "hashes": [
-                "sha256:1d8a5ae1ff6c5cf9b93e8811e581232ad8920aeec647c37316ceac982b08cb2d",
-                "sha256:cd7b2d1018258d7247a71425e9f26463dfb444d411c39569972f4ce586b0c9d8"
-            ],
-            "version": "==0.10.0"
-        },
-        "ebooklib": {
-            "hashes": [
-                "sha256:fe23e22c28050196c68db3e7b13b257bf39426d927cb395c6f2cc13ac11327f1"
-            ],
-            "index": "pypi",
-            "version": "==0.17.1"
-        },
-        "flask": {
-            "hashes": [
-                "sha256:4efa1ae2d7c9865af48986de8aeb8504bf32c7f3d6fdc9353d34b21f4b127060",
-                "sha256:8a4fdd8936eba2512e9c85df320a37e694c93945b33ef33c89946a340a238557"
-            ],
-            "index": "pypi",
-            "version": "==1.1.2"
-        },
-        "idna": {
-            "hashes": [
-                "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
-                "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
-            ],
-            "version": "==2.10"
-        },
-        "itsdangerous": {
-            "hashes": [
-                "sha256:1f08ac48fe58cb99a1f58add0c90924b4267398bbd1640268d26a29f6a03eaa4",
-                "sha256:26ba8fb99157bbd5a1016f9d9dc5ed5ff1325f6f6f2c10b18107199470676b4d"
-            ],
-            "version": "==2.0.0a1"
-        },
-        "jinja2": {
-            "hashes": [
-                "sha256:c10142f819c2d22bdcd17548c46fa9b77cf4fda45097854c689666bf425e7484",
-                "sha256:c922560ac46888d47384de1dbdc3daaa2ea993af4b26a436dec31fa2c19ec668"
-            ],
-            "version": "==3.0.0a1"
-        },
-        "kiwisolver": {
-            "hashes": [
-                "sha256:03662cbd3e6729f341a97dd2690b271e51a67a68322affab12a5b011344b973c",
-                "sha256:18d749f3e56c0480dccd1714230da0f328e6e4accf188dd4e6884bdd06bf02dd",
-                "sha256:247800260cd38160c362d211dcaf4ed0f7816afb5efe56544748b21d6ad6d17f",
-                "sha256:38d05c9ecb24eee1246391820ed7137ac42a50209c203c908154782fced90e44",
-                "sha256:443c2320520eda0a5b930b2725b26f6175ca4453c61f739fef7a5847bd262f74",
-                "sha256:4eadb361baf3069f278b055e3bb53fa189cea2fd02cb2c353b7a99ebb4477ef1",
-                "sha256:556da0a5f60f6486ec4969abbc1dd83cf9b5c2deadc8288508e55c0f5f87d29c",
-                "sha256:603162139684ee56bcd57acc74035fceed7dd8d732f38c0959c8bd157f913fec",
-                "sha256:60a78858580761fe611d22127868f3dc9f98871e6fdf0a15cc4203ed9ba6179b",
-                "sha256:63f55f490b958b6299e4e5bdac66ac988c3d11b7fafa522800359075d4fa56d1",
-                "sha256:7cc095a4661bdd8a5742aaf7c10ea9fac142d76ff1770a0f84394038126d8fc7",
-                "sha256:be046da49fbc3aa9491cc7296db7e8d27bcf0c3d5d1a40259c10471b014e4e0c",
-                "sha256:c31bc3c8e903d60a1ea31a754c72559398d91b5929fcb329b1c3a3d3f6e72113",
-                "sha256:c955791d80e464da3b471ab41eb65cf5a40c15ce9b001fdc5bbc241170de58ec",
-                "sha256:d069ef4b20b1e6b19f790d00097a5d5d2c50871b66d10075dab78938dc2ee2cf",
-                "sha256:d52b989dc23cdaa92582ceb4af8d5bcc94d74b2c3e64cd6785558ec6a879793e",
-                "sha256:e586b28354d7b6584d8973656a7954b1c69c93f708c0c07b77884f91640b7657",
-                "sha256:efcf3397ae1e3c3a4a0a0636542bcad5adad3b1dd3e8e629d0b6e201347176c8",
-                "sha256:fccefc0d36a38c57b7bd233a9b485e2f1eb71903ca7ad7adacad6c28a56d62d2"
-            ],
-            "version": "==1.2.0"
-        },
-        "lxml": {
-            "hashes": [
-                "sha256:05a444b207901a68a6526948c7cc8f9fe6d6f24c70781488e32fd74ff5996e3f",
-                "sha256:08fc93257dcfe9542c0a6883a25ba4971d78297f63d7a5a26ffa34861ca78730",
-                "sha256:107781b213cf7201ec3806555657ccda67b1fccc4261fb889ef7fc56976db81f",
-                "sha256:121b665b04083a1e85ff1f5243d4a93aa1aaba281bc12ea334d5a187278ceaf1",
-                "sha256:1fa21263c3aba2b76fd7c45713d4428dbcc7644d73dcf0650e9d344e433741b3",
-                "sha256:2b30aa2bcff8e958cd85d907d5109820b01ac511eae5b460803430a7404e34d7",
-                "sha256:4b4a111bcf4b9c948e020fd207f915c24a6de3f1adc7682a2d92660eb4e84f1a",
-                "sha256:5591c4164755778e29e69b86e425880f852464a21c7bb53c7ea453bbe2633bbe",
-                "sha256:59daa84aef650b11bccd18f99f64bfe44b9f14a08a28259959d33676554065a1",
-                "sha256:5a9c8d11aa2c8f8b6043d845927a51eb9102eb558e3f936df494e96393f5fd3e",
-                "sha256:5dd20538a60c4cc9a077d3b715bb42307239fcd25ef1ca7286775f95e9e9a46d",
-                "sha256:74f48ec98430e06c1fa8949b49ebdd8d27ceb9df8d3d1c92e1fdc2773f003f20",
-                "sha256:786aad2aa20de3dbff21aab86b2fb6a7be68064cbbc0219bde414d3a30aa47ae",
-                "sha256:7ad7906e098ccd30d8f7068030a0b16668ab8aa5cda6fcd5146d8d20cbaa71b5",
-                "sha256:80a38b188d20c0524fe8959c8ce770a8fdf0e617c6912d23fc97c68301bb9aba",
-                "sha256:8f0ec6b9b3832e0bd1d57af41f9238ea7709bbd7271f639024f2fc9d3bb01293",
-                "sha256:92282c83547a9add85ad658143c76a64a8d339028926d7dc1998ca029c88ea6a",
-                "sha256:94150231f1e90c9595ccc80d7d2006c61f90a5995db82bccbca7944fd457f0f6",
-                "sha256:9dc9006dcc47e00a8a6a029eb035c8f696ad38e40a27d073a003d7d1443f5d88",
-                "sha256:a76979f728dd845655026ab991df25d26379a1a8fc1e9e68e25c7eda43004bed",
-                "sha256:aa8eba3db3d8761db161003e2d0586608092e217151d7458206e243be5a43843",
-                "sha256:bea760a63ce9bba566c23f726d72b3c0250e2fa2569909e2d83cda1534c79443",
-                "sha256:c3f511a3c58676147c277eff0224c061dd5a6a8e1373572ac817ac6324f1b1e0",
-                "sha256:c9d317efde4bafbc1561509bfa8a23c5cab66c44d49ab5b63ff690f5159b2304",
-                "sha256:cc411ad324a4486b142c41d9b2b6a722c534096963688d879ea6fa8a35028258",
-                "sha256:cdc13a1682b2a6241080745b1953719e7fe0850b40a5c71ca574f090a1391df6",
-                "sha256:cfd7c5dd3c35c19cec59c63df9571c67c6d6e5c92e0fe63517920e97f61106d1",
-                "sha256:e1cacf4796b20865789083252186ce9dc6cc59eca0c2e79cca332bdff24ac481",
-                "sha256:e70d4e467e243455492f5de463b72151cc400710ac03a0678206a5f27e79ddef",
-                "sha256:ecc930ae559ea8a43377e8b60ca6f8d61ac532fc57efb915d899de4a67928efd",
-                "sha256:f161af26f596131b63b236372e4ce40f3167c1b5b5d459b29d2514bd8c9dc9ee"
-            ],
-            "version": "==4.5.2"
-        },
-        "markupsafe": {
-            "hashes": [
-                "sha256:06358015a4dee8ee23ae426bf885616ab3963622defd829eb45b44e3dee3515f",
-                "sha256:0b0c4fc852c5f02c6277ef3b33d23fcbe89b1b227460423e3335374da046b6db",
-                "sha256:267677fc42afed5094fc5ea1c4236bbe4b6a00fe4b08e93451e65ae9048139c7",
-                "sha256:303cb70893e2c345588fb5d5b86e0ca369f9bb56942f03064c5e3e75fa7a238a",
-                "sha256:3c9b624a0d9ed5a5093ac4edc4e823e6b125441e60ef35d36e6f4a6fdacd5054",
-                "sha256:42033e14cae1f6c86fc0c3e90d04d08ce73ac8e46ba420a0d22d545c2abd4977",
-                "sha256:4e4a99b6af7bdc0856b50020c095848ec050356a001e1f751510aef6ab14d0e0",
-                "sha256:4eb07faad54bb07427d848f31030a65a49ebb0cec0b30674f91cf1ddd456bfe4",
-                "sha256:63a7161cd8c2bc563feeda45df62f42c860dd0675e2b8da2667f25bb3c95eaba",
-                "sha256:68e0fd039b68d2945b4beb947d4023ca7f8e95b708031c345762efba214ea761",
-                "sha256:8092a63397025c2f655acd42784b2a1528339b90b987beb9253f22e8cdbb36c3",
-                "sha256:841218860683c0f2223e24756843d84cc49cccdae6765e04962607754a52d3e0",
-                "sha256:94076b2314bd2f6cfae508ad65b4d493e3a58a50112b7a2cbb6287bdbc404ae8",
-                "sha256:9d22aff1c5322e402adfb3ce40839a5056c353e711c033798cf4f02eb9f5124d",
-                "sha256:b0e4584f62b3e5f5c1a7bcefd2b52f236505e6ef032cc508caa4f4c8dc8d3af1",
-                "sha256:b1163ffc1384d242964426a8164da12dbcdbc0de18ea36e2c34b898ed38c3b45",
-                "sha256:beac28ed60c8e838301226a7a85841d0af2068eba2dcb1a58c2d32d6c05e440e",
-                "sha256:c29f096ce79c03054a1101d6e5fe6bf04b0bb489165d5e0e9653fb4fe8048ee1",
-                "sha256:c58779966d53e5f14ba393d64e2402a7926601d1ac8adeb4e83893def79d0428",
-                "sha256:cfe14b37908eaf7d5506302987228bff69e1b8e7071ccd4e70fd0283b1b47f0b",
-                "sha256:e834249c45aa9837d0753351cdca61a4b8b383cc9ad0ff2325c97ff7b69e72a6",
-                "sha256:eed1b234c4499811ee85bcefa22ef5e466e75d132502226ed29740d593316c1f"
-            ],
-            "version": "==2.0.0a1"
-        },
-        "matplotlib": {
-            "hashes": [
-                "sha256:09b4096748178bcc764b81587b00ab720eac24965d2bf44ecbe09dcf4e8ed253",
-                "sha256:19cf4db0272da286863a50406f6430101af129f288c421b1a7f33ddfc8d0180f",
-                "sha256:244a9088140a4c540e0a2db9c8ada5ad12520efded592a46e5bc43ff8f0fd0aa",
-                "sha256:24e8db94948019d531ce0bcd637ac24b1c8f6744ac86d2aa0eb6dbaeb1386f82",
-                "sha256:2a9d10930406748b50f60c5fa74c399a1c1080aa6ce6e3fe5f38473b02f6f06d",
-                "sha256:605e4d43b421524ad955a56535391e02866d07bce27c644e2c99e25fb59d63d1",
-                "sha256:695b4165520bdfe381d15a6db03778babb265fee7affdc43e169a881f3f329bc",
-                "sha256:6aa7ea00ad7d898704ffed46e83efd7ec985beba57f507c957979f080678b9ea",
-                "sha256:7c9adba58a67d23cc131c4189da56cb1d0f18a237c43188d831a44e4fc5df15a",
-                "sha256:7ce8f5364c74aac06abad84d8744d659bd86036e86c4ebf14c75ae4292597b46",
-                "sha256:855bb281f3cc8e23ef66064a2beb229674fdf785638091fc82a172e3e84c2780",
-                "sha256:9ccc651261b7044ffc3b1e2f9af17b1ef4c6a12fc080b5a7353ef0b53a50be28",
-                "sha256:b0786ac32983191fcd9cc0230b4ec2f8b3c25dee9beca46ca506c5d6cc5c593d",
-                "sha256:bf8d527a2eb9a5db1c9e5e405d1b1c4e66be983620c9ce80af6aae430d9a0c9c",
-                "sha256:c06ea133b44805d42f2507cb3503f6647b0c7918f1900b5063f5a8a69c63f6d2",
-                "sha256:c1f850908600efa60f81ad14eedbaf7cb17185a2c6d26586ae826ae5ce21f6e0",
-                "sha256:cef05e9a2302f96d6f0666ee70ac7715cbc12e3802d8b8eb80bacd6ab81a0a24",
-                "sha256:e3868686f3023644523df486fc224b0af4349f3cdb933b0a71f261a574d7b65f",
-                "sha256:ebb6168c9330309b1f3360d36c481d8cd621a490cf2a69c9d6625b2a76777c12",
-                "sha256:f74c39621b03cec7bc08498f140192ac26ca940ef20beac6dfad3714d2298b2a",
-                "sha256:f9753c6292d5a1fe46828feb38d1de1820e3ea109a5fea0b6ea1dca6e9d0b220"
-            ],
-            "index": "pypi",
-            "version": "==3.3.0"
-        },
-        "numpy": {
-            "hashes": [
-                "sha256:082f8d4dd69b6b688f64f509b91d482362124986d98dc7dc5f5e9f9b9c3bb983",
-                "sha256:1bc0145999e8cb8aed9d4e65dd8b139adf1919e521177f198529687dbf613065",
-                "sha256:309cbcfaa103fc9a33ec16d2d62569d541b79f828c382556ff072442226d1968",
-                "sha256:3673c8b2b29077f1b7b3a848794f8e11f401ba0b71c49fbd26fb40b71788b132",
-                "sha256:480fdd4dbda4dd6b638d3863da3be82873bba6d32d1fc12ea1b8486ac7b8d129",
-                "sha256:56ef7f56470c24bb67fb43dae442e946a6ce172f97c69f8d067ff8550cf782ff",
-                "sha256:5a936fd51049541d86ccdeef2833cc89a18e4d3808fe58a8abeb802665c5af93",
-                "sha256:5b6885c12784a27e957294b60f97e8b5b4174c7504665333c5e94fbf41ae5d6a",
-                "sha256:667c07063940e934287993366ad5f56766bc009017b4a0fe91dbd07960d0aba7",
-                "sha256:7ed448ff4eaffeb01094959b19cbaf998ecdee9ef9932381420d514e446601cd",
-                "sha256:8343bf67c72e09cfabfab55ad4a43ce3f6bf6e6ced7acf70f45ded9ebb425055",
-                "sha256:92feb989b47f83ebef246adabc7ff3b9a59ac30601c3f6819f8913458610bdcc",
-                "sha256:935c27ae2760c21cd7354402546f6be21d3d0c806fffe967f745d5f2de5005a7",
-                "sha256:aaf42a04b472d12515debc621c31cf16c215e332242e7a9f56403d814c744624",
-                "sha256:b12e639378c741add21fbffd16ba5ad25c0a1a17cf2b6fe4288feeb65144f35b",
-                "sha256:b1cca51512299841bf69add3b75361779962f9cee7d9ee3bb446d5982e925b69",
-                "sha256:b8456987b637232602ceb4d663cb34106f7eb780e247d51a260b84760fd8f491",
-                "sha256:b9792b0ac0130b277536ab8944e7b754c69560dac0415dd4b2dbd16b902c8954",
-                "sha256:c9591886fc9cbe5532d5df85cb8e0cc3b44ba8ce4367bd4cf1b93dc19713da72",
-                "sha256:cf1347450c0b7644ea142712619533553f02ef23f92f781312f6a3553d031fc7",
-                "sha256:de8b4a9b56255797cbddb93281ed92acbc510fb7b15df3f01bd28f46ebc4edae",
-                "sha256:e1b1dc0372f530f26a03578ac75d5e51b3868b9b76cd2facba4c9ee0eb252ab1",
-                "sha256:e45f8e981a0ab47103181773cc0a54e650b2aef8c7b6cd07405d0fa8d869444a",
-                "sha256:e4f6d3c53911a9d103d8ec9518190e52a8b945bab021745af4939cfc7c0d4a9e",
-                "sha256:ed8a311493cf5480a2ebc597d1e177231984c818a86875126cfd004241a73c3e",
-                "sha256:ef71a1d4fd4858596ae80ad1ec76404ad29701f8ca7cdcebc50300178db14dfc"
-            ],
-            "index": "pypi",
-            "version": "==1.19.1"
-        },
-        "pandas": {
-            "hashes": [
-                "sha256:0210f8fe19c2667a3817adb6de2c4fd92b1b78e1975ca60c0efa908e0985cbdb",
-                "sha256:0227e3a6e3a22c0e283a5041f1e3064d78fbde811217668bb966ed05386d8a7e",
-                "sha256:0bc440493cf9dc5b36d5d46bbd5508f6547ba68b02a28234cd8e81fdce42744d",
-                "sha256:16504f915f1ae424052f1e9b7cd2d01786f098fbb00fa4e0f69d42b22952d798",
-                "sha256:182a5aeae319df391c3df4740bb17d5300dcd78034b17732c12e62e6dd79e4a4",
-                "sha256:35db623487f00d9392d8af44a24516d6cb9f274afaf73cfcfe180b9c54e007d2",
-                "sha256:40ec0a7f611a3d00d3c666c4cceb9aa3f5bf9fbd81392948a93663064f527203",
-                "sha256:47a03bfef80d6812c91ed6fae43f04f2fa80a4e1b82b35aa4d9002e39529e0b8",
-                "sha256:4b21d46728f8a6be537716035b445e7ef3a75dbd30bd31aa1b251323219d853e",
-                "sha256:4d1a806252001c5db7caecbe1a26e49a6c23421d85a700960f6ba093112f54a1",
-                "sha256:60e20a4ab4d4fec253557d0fc9a4e4095c37b664f78c72af24860c8adcd07088",
-                "sha256:9f61cca5262840ff46ef857d4f5f65679b82188709d0e5e086a9123791f721c8",
-                "sha256:a15835c8409d5edc50b4af93be3377b5dd3eb53517e7f785060df1f06f6da0e2",
-                "sha256:b39508562ad0bb3f384b0db24da7d68a2608b9ddc85b1d931ccaaa92d5e45273",
-                "sha256:ed60848caadeacecefd0b1de81b91beff23960032cded0ac1449242b506a3b3f",
-                "sha256:fc714895b6de6803ac9f661abb316853d0cd657f5d23985222255ad76ccedc25"
-            ],
-            "index": "pypi",
-            "version": "==1.1.0"
-        },
-        "pillow": {
-            "hashes": [
-                "sha256:0295442429645fa16d05bd567ef5cff178482439c9aad0411d3f0ce9b88b3a6f",
-                "sha256:06aba4169e78c439d528fdeb34762c3b61a70813527a2c57f0540541e9f433a8",
-                "sha256:09d7f9e64289cb40c2c8d7ad674b2ed6105f55dc3b09aa8e4918e20a0311e7ad",
-                "sha256:0a80dd307a5d8440b0a08bd7b81617e04d870e40a3e46a32d9c246e54705e86f",
-                "sha256:1ca594126d3c4def54babee699c055a913efb01e106c309fa6b04405d474d5ae",
-                "sha256:25930fadde8019f374400f7986e8404c8b781ce519da27792cbe46eabec00c4d",
-                "sha256:431b15cffbf949e89df2f7b48528be18b78bfa5177cb3036284a5508159492b5",
-                "sha256:52125833b070791fcb5710fabc640fc1df07d087fc0c0f02d3661f76c23c5b8b",
-                "sha256:5e51ee2b8114def244384eda1c82b10e307ad9778dac5c83fb0943775a653cd8",
-                "sha256:612cfda94e9c8346f239bf1a4b082fdd5c8143cf82d685ba2dba76e7adeeb233",
-                "sha256:6d7741e65835716ceea0fd13a7d0192961212fd59e741a46bbed7a473c634ed6",
-                "sha256:6edb5446f44d901e8683ffb25ebdfc26988ee813da3bf91e12252b57ac163727",
-                "sha256:725aa6cfc66ce2857d585f06e9519a1cc0ef6d13f186ff3447ab6dff0a09bc7f",
-                "sha256:8dad18b69f710bf3a001d2bf3afab7c432785d94fcf819c16b5207b1cfd17d38",
-                "sha256:94cf49723928eb6070a892cb39d6c156f7b5a2db4e8971cb958f7b6b104fb4c4",
-                "sha256:97f9e7953a77d5a70f49b9a48da7776dc51e9b738151b22dacf101641594a626",
-                "sha256:9ad7f865eebde135d526bb3163d0b23ffff365cf87e767c649550964ad72785d",
-                "sha256:a060cf8aa332052df2158e5a119303965be92c3da6f2d93b6878f0ebca80b2f6",
-                "sha256:c79f9c5fb846285f943aafeafda3358992d64f0ef58566e23484132ecd8d7d63",
-                "sha256:c92302a33138409e8f1ad16731568c55c9053eee71bb05b6b744067e1b62380f",
-                "sha256:d08b23fdb388c0715990cbc06866db554e1822c4bdcf6d4166cf30ac82df8c41",
-                "sha256:d350f0f2c2421e65fbc62690f26b59b0bcda1b614beb318c81e38647e0f673a1",
-                "sha256:ec29604081f10f16a7aea809ad42e27764188fc258b02259a03a8ff7ded3808d",
-                "sha256:edf31f1150778abd4322444c393ab9c7bd2af271dd4dafb4208fb613b1f3cdc9",
-                "sha256:f7e30c27477dffc3e85c2463b3e649f751789e0f6c8456099eea7ddd53be4a8a",
-                "sha256:ffe538682dc19cc542ae7c3e504fdf54ca7f86fb8a135e59dd6bc8627eae6cce"
-            ],
-            "index": "pypi",
-            "version": "==7.2.0"
-        },
-        "pyparsing": {
-            "hashes": [
-                "sha256:1060635ca5ac864c2b7bc7b05a448df4e32d7d8c65e33cbe1514810d339672a2",
-                "sha256:56a551039101858c9e189ac9e66e330a03fb7079e97ba6b50193643905f450ce"
-            ],
-            "version": "==3.0.0a2"
-        },
-        "python-dateutil": {
-            "hashes": [
-                "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c",
-                "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"
-            ],
-            "version": "==2.8.1"
-        },
-        "python-libxdo": {
-            "hashes": [
-                "sha256:718d2677d55e2aaa7c5c549ecf063750efaf3ea6d187738f5ea91ad31bf65b0f"
-            ],
-            "index": "pypi",
-            "version": "==0.1.2a1"
-        },
-        "pytz": {
-            "hashes": [
-                "sha256:a494d53b6d39c3c6e44c3bec237336e14305e4f29bbf800b599253057fbb79ed",
-                "sha256:c35965d010ce31b23eeb663ed3cc8c906275d6be1a34393a1d73a41febf4a048"
-            ],
-            "version": "==2020.1"
-        },
-        "pyyaml": {
-            "hashes": [
-                "sha256:06a0d7ba600ce0b2d2fe2e78453a470b5a6e000a985dd4a4e54e436cc36b0e97",
-                "sha256:240097ff019d7c70a4922b6869d8a86407758333f02203e0fc6ff79c5dcede76",
-                "sha256:4f4b913ca1a7319b33cfb1369e91e50354d6f07a135f3b901aca02aa95940bd2",
-                "sha256:69f00dca373f240f842b2931fb2c7e14ddbacd1397d57157a9b005a6a9942648",
-                "sha256:73f099454b799e05e5ab51423c7bcf361c58d3206fa7b0d555426b1f4d9a3eaf",
-                "sha256:74809a57b329d6cc0fdccee6318f44b9b8649961fa73144a98735b0aaf029f1f",
-                "sha256:7739fc0fa8205b3ee8808aea45e968bc90082c10aef6ea95e855e10abf4a37b2",
-                "sha256:95f71d2af0ff4227885f7a6605c37fd53d3a106fcab511b8860ecca9fcf400ee",
-                "sha256:b8eac752c5e14d3eca0e6dd9199cd627518cb5ec06add0de9d32baeee6fe645d",
-                "sha256:cc8955cfbfc7a115fa81d85284ee61147059a753344bc51098f3ccd69b0d7e0c",
-                "sha256:d13155f591e6fcc1ec3b30685d50bf0711574e2c0dfffd7644babf8b5102ca1a"
-            ],
-            "index": "pypi",
-            "version": "==5.3.1"
-        },
-        "requests": {
-            "hashes": [
-                "sha256:b3559a131db72c33ee969480840fff4bb6dd111de7dd27c8ee1f820f4f00231b",
-                "sha256:fe75cc94a9443b9246fc7049224f75604b113c36acb93f87b80ed42c44cbb898"
-            ],
-            "index": "pypi",
-            "version": "==2.24.0"
-        },
-        "six": {
-            "hashes": [
-                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
-                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
-            ],
-            "version": "==1.15.0"
-        },
-        "soupsieve": {
-            "hashes": [
-                "sha256:1634eea42ab371d3d346309b93df7870a88610f0725d47528be902a0d95ecc55",
-                "sha256:a59dc181727e95d25f781f0eb4fd1825ff45590ec8ff49eadfd7f1a537cc0232"
-            ],
-            "version": "==2.0.1"
-        },
-        "tqdm": {
-            "hashes": [
-                "sha256:6baa75a88582b1db6d34ce4690da5501d2a1cb65c34664840a456b2c9f794d29",
-                "sha256:fcb7cb5b729b60a27f300b15c1ffd4744f080fb483b88f31dc8654b082cc8ea5"
-            ],
-            "index": "pypi",
-            "version": "==4.48.0"
-        },
-        "urllib3": {
-            "hashes": [
-                "sha256:91056c15fa70756691db97756772bb1eb9678fa585d9184f24534b100dc60f4a",
-                "sha256:e7983572181f5e1522d9c98453462384ee92a0be7fac5f1413a1e35c56cc0461"
-            ],
-            "version": "==1.25.10"
-        },
-        "werkzeug": {
-            "hashes": [
-                "sha256:2de2a5db0baeae7b2d2664949077c2ac63fbd16d98da0ff71837f7d1dea3fd43",
-                "sha256:6c80b1e5ad3665290ea39320b91e1be1e0d5f60652b964a3070216de83d2e47c"
-            ],
-            "version": "==1.0.1"
-        }
-    },
-    "develop": {}
-}
diff --git a/animetosho2mks.py b/animetosho2mks.py
index dc375df..a42916d 100755
--- a/animetosho2mks.py
+++ b/animetosho2mks.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.tqdm ])" mkvtoolnix-cli
 from subprocess import run
 from tqdm import tqdm
 import glob
diff --git a/ass2mks.py b/ass2mks.py
index d53c75a..f033e8e 100755
--- a/ass2mks.py
+++ b/ass2mks.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p python3 ffmpeg-full
 from subprocess import run
 import mimetypes
 import os.path
diff --git a/cbz2ebook.sh b/cbz2ebook.sh
index da87116..9421ed4 100755
--- a/cbz2ebook.sh
+++ b/cbz2ebook.sh
@@ -1,4 +1,4 @@
-#!/bin/zsh -i
+#!/usr/bin/env zsh -i
 set -e
 
 size="1440x1920" # Kobo Forma
diff --git a/encoder-parameters.py b/encoder-parameters.py
index 2111836..2390ee3 100755
--- a/encoder-parameters.py
+++ b/encoder-parameters.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p python3
 import sys
 import subprocess
 import json
diff --git a/latexpic.sh b/latexpic.sh
index 5678f59..c39bea3 100755
--- a/latexpic.sh
+++ b/latexpic.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 tmpdir=$(mktemp -d)
 cd $tmpdir
 
diff --git a/odrive-proxy.py b/odrive-proxy.py
index bab9583..a6e5b78 100755
--- a/odrive-proxy.py
+++ b/odrive-proxy.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p "python3.withPackages(ps: with ps; [ ps.flask ps.requests ])"
 from flask import Flask, redirect
 import requests
 
diff --git a/run.sh b/run.sh
deleted file mode 100755
index 0110f46..0000000
--- a/run.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/sh
-SCRIPTS_DIR="$(dirname $(realpath $0))"
-WORKING_DIR="$(pwd)"
-SCRIPT="$1"
-
-shift
-
-. $(cd $SCRIPTS_DIR && pipenv --venv)/bin/activate
-${SCRIPTS_DIR}/${SCRIPT}.py "$@"
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..f7886ab
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,14 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  nativeBuildInputs = with pkgs; [
+    gitAndTools.pre-commit
+    (python3.withPackages(ps: [ ps.virtualenv ]))
+  ];
+  shellHook = ''
+    # black’s pre-commit hook builds a wheel (zip file) for black and fails
+    # when the timestamp is lower than 1980 (due to zip limitations)
+    export SOURCE_DATE_EPOCH=315532800
+    pre-commit install -f >/dev/null
+  '';
+}
diff --git a/ssim-stats.py b/ssim-stats.py
index 88502ea..df1f698 100755
--- a/ssim-stats.py
+++ b/ssim-stats.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p "python3.withPackages(ps: with ps; [ ps.pandas ps.numpy ps.tabulate ])"
 import pandas as pd
 import numpy as np
 import sys
diff --git a/wordclock.py b/wordclock.py
index 643125e..8784cc0 100755
--- a/wordclock.py
+++ b/wordclock.py
@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.paho-mqtt ])"
 import sys
 import paho.mqtt.client as mqtt
 import wordclock_credentials as creds