it works

.gitignore

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+*.beam
+*.ez
+/build
+erl_crash.dump
+.github
+members.*

README.md

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+# constellation
+
+[![Package Version](https://img.shields.io/hexpm/v/constellation)](https://hex.pm/packages/constellation)
+[![Hex Docs](https://img.shields.io/badge/hex-docs-ffaff3)](https://hexdocs.pm/constellation/)
+
+```sh
+gleam add constellation
+```
+```gleam
+import constellation
+
+pub fn main() {
+  // TODO: An example of the project in use
+}
+```
+
+Further documentation can be found at <https://hexdocs.pm/constellation>.
+
+## Development
+
+```sh
+gleam run   # Run the project
+gleam test  # Run the tests
+gleam shell # Run an Erlang shell
+```

gleam.toml

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+name = "constellation"
+version = "1.0.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# description = ""
+# licences = ["Apache-2.0"]
+# repository = { type = "github", user = "username", repo = "project" }
+# links = [{ title = "Website", href = "https://gleam.run" }]
+#
+# For a full reference of all the available options, you can have a look at
+# https://gleam.run/writing-gleam/gleam-toml/. 
+
+[dependencies]
+gleam_stdlib = "~> 0.34 or ~> 1.0"
+wisp = "~> 0.14"
+mist = "~> 1.0"
+sqlight = "~> 0.9"
+glesha = "~> 0.1"
+simplifile = "~> 1.6"
+
+[dev-dependencies]
+gleeunit = "~> 1.0"

manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "birl", version = "1.6.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "ranger"], otp_app = "birl", source = "hex", outer_checksum = "0757CFE97DA52F19BC3262AC3DD284D9DAD2718D4C1830888DE483FB147477D4" },
+  { name = "esqlite", version = "0.8.6", build_tools = ["rebar3"], requirements = [], otp_app = "esqlite", source = "hex", outer_checksum = "607E45F4DA42601D8F530979417F57A4CD629AB49085891849302057E68EA188" },
+  { name = "exception", version = "2.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "exception", source = "hex", outer_checksum = "F5580D584F16A20B7FCDCABF9E9BE9A2C1F6AC4F9176FA6DD0B63E3B20D450AA" },
+  { name = "filepath", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "EFB6FF65C98B2A16378ABC3EE2B14124168C0CE5201553DE652E2644DCFDB594" },
+  { name = "gleam_crypto", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_crypto", source = "hex", outer_checksum = "ADD058DEDE8F0341F1ADE3AAC492A224F15700829D9A3A3F9ADF370F875C51B7" },
+  { name = "gleam_erlang", version = "0.25.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "054D571A7092D2A9727B3E5D183B7507DAB0DA41556EC9133606F09C15497373" },
+  { name = "gleam_http", version = "3.6.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_http", source = "hex", outer_checksum = "8C07DF9DF8CC7F054C650839A51C30A7D3C26482AC241C899C1CEA86B22DBE51" },
+  { name = "gleam_json", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "thoas"], otp_app = "gleam_json", source = "hex", outer_checksum = "8B197DD5D578EA6AC2C0D4BDC634C71A5BCA8E7DB5F47091C263ECB411A60DF3" },
+  { name = "gleam_otp", version = "0.10.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "0B04FE915ACECE539B317F9652CAADBBC0F000184D586AAAF2D94C100945D72B" },
+  { name = "gleam_stdlib", version = "0.36.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "C0D14D807FEC6F8A08A7C9EF8DFDE6AE5C10E40E21325B2B29365965D82EB3D4" },
+  { name = "gleeunit", version = "1.0.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "D364C87AFEB26BDB4FB8A5ABDE67D635DC9FA52D6AB68416044C35B096C6882D" },
+  { name = "glesha", version = "0.1.3", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glesha", source = "hex", outer_checksum = "8DC5F211670C12870FC36C211B8C0A0FFB07BC83708484174CAE1F9DA4B8AF9F" },
+  { name = "glisten", version = "2.0.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_otp", "gleam_stdlib"], otp_app = "glisten", source = "hex", outer_checksum = "CF3A9383E9BA4A8CBAF2F7B799716290D02F2AC34E7A77556B49376B662B9314" },
+  { name = "hpack_erl", version = "0.3.0", build_tools = ["rebar3"], requirements = [], otp_app = "hpack", source = "hex", outer_checksum = "D6137D7079169D8C485C6962DFE261AF5B9EF60FBC557344511C1E65E3D95FB0" },
+  { name = "logging", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "logging", source = "hex", outer_checksum = "82C112ED9B6C30C1772A6FE2613B94B13F62EA35F5869A2630D13948D297BD39" },
+  { name = "marceau", version = "1.1.0", build_tools = ["gleam"], requirements = [], otp_app = "marceau", source = "hex", outer_checksum = "1AAD727A30BE0F95562C3403BB9B27C823797AD90037714255EEBF617B1CDA81" },
+  { name = "mist", version = "1.0.0", build_tools = ["gleam"], requirements = ["birl", "gleam_erlang", "gleam_http", "gleam_otp", "gleam_stdlib", "glisten", "hpack_erl", "logging"], otp_app = "mist", source = "hex", outer_checksum = "7765E53DCC9ACCACF217B8E0CA3DE7E848C783BFAE5118B75011E81C2C80385C" },
+  { name = "ranger", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "ranger", source = "hex", outer_checksum = "28E615AE7590ED922AF1510DDF606A2ECBBC2A9609AF36D412EDC925F06DFD20" },
+  { name = "simplifile", version = "1.6.1", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "B75D3C64E526D9D7EDEED5F3BA31DAAF5F2B4D80A4183FE17FDB02ED526E4E96" },
+  { name = "sqlight", version = "0.9.0", build_tools = ["gleam"], requirements = ["esqlite", "gleam_stdlib"], otp_app = "sqlight", source = "hex", outer_checksum = "2D9C9BA420A5E7DCE7DB2DAAE4CAB0BE6218BEB48FD1531C583550B3D1316E94" },
+  { name = "thoas", version = "0.4.1", build_tools = ["rebar3"], requirements = [], otp_app = "thoas", source = "hex", outer_checksum = "4918D50026C073C4AB1388437132C77A6F6F7C8AC43C60C13758CC0ADCE2134E" },
+  { name = "wisp", version = "0.14.0", build_tools = ["gleam"], requirements = ["exception", "gleam_crypto", "gleam_erlang", "gleam_http", "gleam_json", "gleam_stdlib", "logging", "marceau", "mist", "simplifile"], otp_app = "wisp", source = "hex", outer_checksum = "9F5453AF1F9275E6F8707BC815D6A6A9DF41551921B16FBDBA52883773BAE684" },
+]
+
+[requirements]
+gleam_stdlib = { version = "~> 0.34 or ~> 1.0" }
+gleeunit = { version = "~> 1.0" }
+glesha = { version = "~> 0.1" }
+mist = { version = "~> 1.0" }
+simplifile = { version = "~> 1.6"}
+sqlight = { version = "~> 0.9" }
+wisp = { version = "~> 0.14" }

src/constellation.gleam

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+import gleam/io
+import gleam/list
+import gleam/dict
+import gleam/bit_array
+import gleam/string
+import gleam/result
+import gleam/dynamic
+import glesha
+import sqlight
+import simplifile
+
+pub fn main() {
+  let db_path = "members.db"
+  use conn <- sqlight.with_connection(db_path)
+
+  let _ = try_create_table(conn)
+
+  use text <- result.map(simplifile.read("members.txt"))
+  text  
+  |> string.trim
+  |> string.split(_, "\n")
+  |> create_ring
+  |> list.map(create_member(conn, _))
+  |> io.debug()
+}
+
+fn create_member(conn, row: Row) {
+  let sql =
+    "
+ insert into ring (hash, member, previous, next) values 
+ (?, ?, ?, ?)
+  "
+sqlight.query(
+    sql,
+    on: conn,
+    with: [
+      sqlight.text(row.hash),
+      sqlight.text(row.link),
+      sqlight.text(row.previous),
+      sqlight.text(row.next)
+    ],
+    expecting: dynamic.dynamic,
+  )
+}
+
+fn try_create_table(conn) {
+  let sql =
+    "
+ drop table ring;
+ create table ring (hash text PRIMARY KEY, member text, previous text, next text);
+ "
+  let _ = sqlight.exec(sql, conn)
+}
+
+fn hash(string) {
+  {string <> "salty salt"}
+  |> bit_array.from_string()
+  |> glesha.hash(glesha.Sha256)
+  |> bit_array.base64_url_encode(False)
+  |> string.slice(0, 16)
+}
+
+pub type Row {
+  Row(
+    link: String,
+    hash: String,
+    previous: String,
+    next: String
+  )
+}
+
+pub type Node(a) {
+  Node(previous: a, next: a)
+}
+
+fn create_ring(list) {
+  do_window([], list, list)
+}
+
+fn do_window(acc, l, original) {
+  let window = list.take(l, 3)
+
+  case window {
+    [a, b, c, ..] ->
+      do_window([Row(b, hash(b), previous: a, next: c), ..acc], list.drop(l, 1), original)
+    [a, b] -> {
+      let assert [c] = list.take(original, 1)
+      do_window([Row(b, hash(b), previous: a, next: c), ..acc], list.drop(l, 1), original)
+    }
+    [a] -> {
+      let assert [b, c] = list.take(original, 2)
+      do_window([Row(b, hash(b), previous: a, next: c), ..acc], list.drop(l, 1), original)
+    }
+    [] -> acc
+  }
+}

test/constellation_test.gleam

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+import gleeunit
+import gleeunit/should
+
+pub fn main() {
+  gleeunit.main()
+}
+
+// gleeunit test functions end in `_test`
+pub fn hello_world_test() {
+  1
+  |> should.equal(1)
+}