Hello, Joe!

.github/workflows/test.yml

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+name: test
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: "26.0.2"
+          gleam-version: "1.2.1"
+          rebar3-version: "3"
+          # elixir-version: "1.15.4"
+      - run: gleam deps download
+      - run: gleam test
+      - run: gleam format --check src test

.gitignore

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

README.md

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+# pretty_diff
+
+[![Package Version](https://img.shields.io/hexpm/v/pretty_diff)](https://hex.pm/packages/pretty_diff)
+[![Hex Docs](https://img.shields.io/badge/hex-docs-ffaff3)](https://hexdocs.pm/pretty_diff/)
+![Supported targets](https://img.shields.io/badge/supports-all_targets-ffaff3)
+
+⚖️ Pretty printing the difference between Gleam values
+
+## Installation
+
+```sh
+gleam add pretty_diff
+```
+
+## Usage
+
+```gleam
+import pretty_diff
+
+pub fn main() {
+  pretty_diff.from(Ok("old"), and: Ok("new"))
+  // -> Ok(-"old" +"new")
+}
+```

birdie_snapshots/complex_diff_1.accepted

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+---
+version: 1.1.6
+title: complex diff 1
+file: ./test/pretty_diff_test.gleam
+test_name: to_string_of_complex_type_1_test
+---
+User(
+  -"Giacomo" +"Tommaso",
+  25,
+  [-"FP" +"OOP", -"Gleam" +"Java", "programming", +"playing the piano"],
+  dict.from_list([
+    +#("Japanese", C1),
+    -#("Spanish", A1),
+    #("Italian", Native),
+    #("English", -C2 +C1),
+  ]),
+)

gleam.toml

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+name = "pretty_diff"
+version = "1.0.0"
+
+description = "⚖️ Pretty diffing of Gleam values"
+licences = ["Apache-2.0"]
+repository = { type = "github", user = "giacomocavalieri", repo = "pretty_diff" }
+
+[dependencies]
+gleam_stdlib = ">= 0.34.0 and < 2.0.0"
+glam = ">= 2.0.1 and < 3.0.0"
+classify = ">= 1.0.0 and < 2.0.0"
+
+[dev-dependencies]
+gleeunit = ">= 1.0.0 and < 2.0.0"
+birdie = ">= 1.1.6 and < 2.0.0"

manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+  { name = "birdie", version = "1.1.6", build_tools = ["gleam"], requirements = ["argv", "filepath", "glance", "gleam_community_ansi", "gleam_erlang", "gleam_stdlib", "justin", "rank", "simplifile", "trie_again"], otp_app = "birdie", source = "hex", outer_checksum = "9DBF73AEF936EAA8D22FFCE2B10CF42E38D62F8A006F89E3FFC1170D5C1E585B" },
+  { name = "classify", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "classify", source = "hex", outer_checksum = "C3353E7310A2FD2EB451DA601D5B59EB1E24E2B995C47ADA551E9C14614B65B0" },
+  { name = "filepath", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "EFB6FF65C98B2A16378ABC3EE2B14124168C0CE5201553DE652E2644DCFDB594" },
+  { name = "glam", version = "2.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glam", source = "hex", outer_checksum = "66EC3BCD632E51EED029678F8DF419659C1E57B1A93D874C5131FE220DFAD2B2" },
+  { name = "glance", version = "0.11.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "8F3314D27773B7C3B9FB58D8C02C634290422CE531988C0394FA0DF8676B964D" },
+  { name = "gleam_community_ansi", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "FE79E08BF97009729259B6357EC058315B6FBB916FAD1C2FF9355115FEB0D3A4" },
+  { name = "gleam_community_colour", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "795964217EBEDB3DA656F5EB8F67D7AD22872EB95182042D3E7AFEF32D3FD2FE" },
+  { name = "gleam_erlang", version = "0.25.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "054D571A7092D2A9727B3E5D183B7507DAB0DA41556EC9133606F09C15497373" },
+  { name = "gleam_json", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib", "thoas"], otp_app = "gleam_json", source = "hex", outer_checksum = "9063D14D25406326C0255BDA0021541E797D8A7A12573D849462CAFED459F6EB" },
+  { name = "gleam_stdlib", version = "0.38.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "663CF11861179AF415A625307447775C09404E752FF99A24E2057C835319F1BE" },
+  { name = "gleeunit", version = "1.1.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "72CDC3D3F719478F26C4E2C5FED3E657AC81EC14A47D2D2DEBB8693CA3220C3B" },
+  { name = "glexer", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "BD477AD657C2B637FEF75F2405FAEFFA533F277A74EF1A5E17B55B1178C228FB" },
+  { name = "justin", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "justin", source = "hex", outer_checksum = "7FA0C6DB78640C6DC5FBFD59BF3456009F3F8B485BF6825E97E1EB44E9A1E2CD" },
+  { name = "rank", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "rank", source = "hex", outer_checksum = "5660E361F0E49CBB714CC57CC4C89C63415D8986F05B2DA0C719D5642FAD91C9" },
+  { name = "simplifile", version = "1.7.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "1D5DFA3A2F9319EC85825F6ED88B8E449F381B0D55A62F5E61424E748E7DDEB0" },
+  { name = "thoas", version = "1.2.1", build_tools = ["rebar3"], requirements = [], otp_app = "thoas", source = "hex", outer_checksum = "E38697EDFFD6E91BD12CEA41B155115282630075C2A727E7A6B2947F5408B86A" },
+  { name = "trie_again", version = "1.1.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "trie_again", source = "hex", outer_checksum = "5B19176F52B1BD98831B57FDC97BD1F88C8A403D6D8C63471407E78598E27184" },
+]
+
+[requirements]
+birdie = { version = ">= 1.1.6 and < 2.0.0"}
+classify = { version = ">= 1.0.0 and < 2.0.0" }
+glam = { version = ">= 2.0.1 and < 3.0.0" }
+gleam_stdlib = { version = ">= 0.34.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }