log-levels

log-levels/.exercism/config.json

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+{
+  "authors": [
+    "lpil"
+  ],
+  "files": {
+    "solution": [
+      "src/log_levels.gleam"
+    ],
+    "test": [
+      "test/log_levels_test.gleam"
+    ],
+    "exemplar": [
+      ".meta/example.gleam"
+    ],
+    "invalidator": [
+      "gleam.toml",
+      "manifest.toml"
+    ]
+  },
+  "forked_from": [
+    "elixir/log-levels"
+  ],
+  "blurb": "Learn about strings by parsing application logs"
+}

log-levels/.exercism/metadata.json

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+{"track":"gleam","exercise":"log-levels","id":"d2fb58bff26843ac85c262169ce0cc3b","url":"https://exercism.org/tracks/gleam/exercises/log-levels","handle":"fw353qwgs","is_requester":true,"auto_approve":false}

log-levels/.gitignore

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

log-levels/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests, run the command `gleam test` from within the exercise directory.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/log_levels.gleam` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Gleam track's documentation](https://exercism.org/docs/tracks/gleam)
+- The [Gleam track's programming category on the forum](https://forum.exercism.org/c/programming/gleam)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [gleam.run](https://gleam.run/documentation/) is the gleam official documentation.
+- [Discord](https://discord.gg/Fm8Pwmy) is the discord channel.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/gleam) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

log-levels/HINTS.md

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+# Hints
+
+## General
+
+- The `gleam/string` module has many useful [string functions][stdlib].
+
+## 1. Get message from a log line
+
+- The `<>` operator can be used in pattern matching to match the beginning of a string.
+- The `gleam/string` module has a [function][trim] to remove surrounding whitespace from a string.
+
+## 2. Get log level from a log line
+
+- The `gleam/string` module has a [function][lowercase] to convert a string to lowercase.
+
+## 3. Reformat a log line
+
+- The `<>` operator can be used to join strings together.
+
+[stdlib]: https://hexdocs.pm/gleam_stdlib/gleam/string.html
+[trim]: https://hexdocs.pm/gleam_stdlib/gleam/string.html#trim
+[lowercase]: https://hexdocs.pm/gleam_stdlib/gleam/string.html#lowercase

log-levels/README.md

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+# Log Levels
+
+Welcome to Log Levels on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
+
+## Introduction
+
+## Strings
+
+Strings in Gleam are immutable text surrounded by double quotes. They support unicode characters, and can be multi-line.
+
+```gleam
+let greeting = "Hello, Joe! 📞"
+
+let multi_line_string = "one
+two
+three"
+```
+
+Strings can be joined together using the `<>` operator:
+
+```gleam
+let name = "Mike"
+"Hello, " <> name <> "!"
+// -> "Hello, Mike!"
+```
+
+The [`gleam/string`][stdlib] module in the standard library provides functions for working with strings.
+
+Strings can be matched upon in case expressions:
+
+```gleam
+pub fn on_an_excellent_adventure(name: String) -> Bool {
+  case name {
+    "Bill" -> True
+    "Ted" -> True
+    _ -> False
+  }
+}
+```
+
+If you want to match on the beginning of a string and assign the rest to a variable you can use the `<>` operator pattern:
+
+```gleam
+pub fn profession(name: String) -> String {
+  case name {
+    "Dr " <> rest -> rest <> " is a doctor"
+    _ -> "I'm not sure what " <> name <> " does"
+  }
+}
+```
+
+[stdlib]: https://hexdocs.pm/gleam_stdlib/gleam/string.html
+
+## Instructions
+
+In this exercise you'll be processing log-lines.
+
+Each log line is a string formatted as follows: `"[<LEVEL>]: <MESSAGE>"`.
+
+There are three different log levels:
+
+- `INFO`
+- `WARNING`
+- `ERROR`
+
+You have three tasks, each of which will take a log line and ask you to do something with it.
+
+## 1. Get message from a log line
+
+Implement the `message` function to return a log line's message:
+
+```gleam
+message("[ERROR]: Invalid operation")
+// -> "Invalid operation"
+```
+
+Any leading or trailing white space should be removed:
+
+```gleam
+message("[WARNING]:  Disk almost full\r\n")
+// -> "Disk almost full"
+```
+
+## 2. Get log level from a log line
+
+Implement the `log_level` function to return a log line's log level, which should be returned in lowercase:
+
+```gleam
+log_level("[ERROR]: Invalid operation")
+// -> "error"
+```
+
+## 3. Reformat a log line
+
+Implement the `reformat` function that reformats the log line, putting the message first and the log level after it in parentheses:
+
+```gleam
+reformat("[INFO]: Operation completed")
+// -> "Operation completed (info)"
+```
+
+## Source
+
+### Created by
+
+- @lpil

log-levels/gleam.toml

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+name = "log_levels"
+version = "0.1.0"
+
+[dependencies]
+gleam_otp = "~> 0.7 or ~> 1.0"
+gleam_stdlib = ">= 0.54.0 or ~> 1.0"
+simplifile = "~> 1.0"
+gleam_erlang = ">= 0.25.0 and < 1.0.0"
+gleam_yielder = ">= 1.1.0 and < 2.0.0"
+gleam_regexp = ">= 1.1.0 and < 2.0.0"
+gleam_deque = ">= 1.0.0 and < 2.0.0"
+
+[dev-dependencies]
+exercism_test_runner = "~> 1.9"

log-levels/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 = "exercism_test_runner", version = "1.9.0", build_tools = ["gleam"], requirements = ["argv", "gap", "glance", "gleam_community_ansi", "gleam_erlang", "gleam_json", "gleam_stdlib", "simplifile"], otp_app = "exercism_test_runner", source = "hex", outer_checksum = "0B17BB25F2FF1E60266467C24FE0CA04005410306AA05E9A4B41B1852D72865C" },
+  { name = "filepath", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "67A6D15FB39EEB69DD31F8C145BB5A421790581BD6AA14B33D64D5A55DBD6587" },
+  { name = "gap", version = "1.1.3", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "6EF5E3B523FDFBC317E9EA28D5163EE04744A97C007106F90207569789612291" },
+  { name = "glance", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "E155BA1A787FD11827048355021C0390D2FE9A518485526F631A9D472858CC6D" },
+  { name = "gleam_community_ansi", version = "1.4.3", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_regexp", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "8A62AE9CC6EA65BEA630D95016D6C07E4F9973565FA3D0DE68DC4200D8E0DD27" },
+  { name = "gleam_community_colour", version = "2.0.0", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "FDD6AC62C6EC8506C005949A4FCEF032038191D5EAAEC3C9A203CD53AE956ACA" },
+  { name = "gleam_deque", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_deque", source = "hex", outer_checksum = "64D77068931338CF0D0CB5D37522C3E3CCA7CB7D6C5BACB41648B519CC0133C7" },
+  { name = "gleam_erlang", version = "0.34.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "0C38F2A128BAA0CEF17C3000BD2097EB80634E239CE31A86400C4416A5D0FDCC" },
+  { name = "gleam_json", version = "2.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_json", source = "hex", outer_checksum = "C55C5C2B318533A8072D221C5E06E5A75711C129E420DD1CE463342106012E5D" },
+  { name = "gleam_otp", version = "0.16.1", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "50DA1539FC8E8FA09924EB36A67A2BBB0AD6B27BCDED5A7EF627057CF69D035E" },
+  { name = "gleam_regexp", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_regexp", source = "hex", outer_checksum = "7F5E0C0BBEB3C58E57C9CB05FA9002F970C85AD4A63BA1E55CBCB35C15809179" },
+  { name = "gleam_stdlib", version = "0.55.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "32D8F4AE03771516950047813A9E359249BD9FBA5C33463FDB7B953D6F8E896B" },
+  { name = "gleam_yielder", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_yielder", source = "hex", outer_checksum = "8E4E4ECFA7982859F430C57F549200C7749823C106759F4A19A78AEA6687717A" },
+  { name = "glexer", version = "2.2.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "5C235CBDF4DA5203AD5EAB1D6D8B456ED8162C5424FE2309CFFB7EF438B7C269" },
+  { name = "simplifile", version = "1.7.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "1D5DFA3A2F9319EC85825F6ED88B8E449F381B0D55A62F5E61424E748E7DDEB0" },
+]
+
+[requirements]
+exercism_test_runner = { version = "~> 1.9" }
+gleam_deque = { version = ">= 1.0.0 and < 2.0.0" }
+gleam_erlang = { version = ">= 0.25.0 and < 1.0.0" }
+gleam_otp = { version = "~> 0.7 or ~> 1.0" }
+gleam_regexp = { version = ">= 1.1.0 and < 2.0.0" }
+gleam_stdlib = { version = ">= 0.54.0 or ~> 1.0" }
+gleam_yielder = { version = ">= 1.1.0 and < 2.0.0" }
+simplifile = { version = "~> 1.0" }

log-levels/src/log_levels.gleam

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+import gleam/string
+
+pub fn message(log_line: String) -> String {
+  case log_line {
+    "[INFO]:" <> rest -> string.trim(rest)
+    "[WARNING]:" <> rest -> string.trim(rest)
+    "[ERROR]:" <> rest -> string.trim(rest)
+    _ -> log_line
+  }
+}
+
+pub fn log_level(log_line: String) -> String {
+  case log_line {
+    "[INFO]" <> _ -> "info"
+    "[WARNING]" <> _ -> "warning"
+    "[ERROR]" <> _ -> "error"
+    _ -> log_line
+  }
+}
+
+pub fn reformat(log_line: String) -> String {
+  case log_line {
+    "[INFO]:" <> rest -> string.trim(rest) <> " (info)"
+    "[WARNING]:" <> rest -> string.trim(rest) <> " (warning)"
+    "[ERROR]:" <> rest -> string.trim(rest) <> " (error)"
+    _ -> log_line
+  }
+}

log-levels/test/log_levels_test.gleam

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+import exercism/should
+import exercism/test_runner
+import log_levels
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn error_message_test() {
+  log_levels.message("[ERROR]: Stack overflow")
+  |> should.equal("Stack overflow")
+}
+
+pub fn warning_message_test() {
+  log_levels.message("[WARNING]: Disk almost full")
+  |> should.equal("Disk almost full")
+}
+
+pub fn info_message_test() {
+  log_levels.message("[INFO]: File moved")
+  |> should.equal("File moved")
+}
+
+pub fn message_with_leading_and_trailing_white_space_test() {
+  log_levels.message("[WARNING]:   \tTimezone not set  \r\n")
+  |> should.equal("Timezone not set")
+}
+
+pub fn error_log_level_test() {
+  log_levels.log_level("[ERROR]: Disk full")
+  |> should.equal("error")
+}
+
+pub fn warning_log_level_test() {
+  log_levels.log_level("[WARNING]: Unsafe password")
+  |> should.equal("warning")
+}
+
+pub fn info_log_level_test() {
+  log_levels.log_level("[INFO]: Timezone changed")
+  |> should.equal("info")
+}
+
+pub fn error_reformat_test() {
+  log_levels.reformat("[ERROR]: Segmentation fault")
+  |> should.equal("Segmentation fault (error)")
+}
+
+pub fn warning_reformat_test() {
+  log_levels.reformat("[WARNING]: Decreased performance")
+  |> should.equal("Decreased performance (warning)")
+}
+
+pub fn info_reformat_test() {
+  log_levels.reformat("[INFO]: Disk defragmented")
+  |> should.equal("Disk defragmented (info)")
+}
+
+pub fn reformat_with_leading_and_trailing_white_space_test() {
+  log_levels.reformat("[ERROR]: \t Corrupt disk\t \t \r\n")
+  |> should.equal("Corrupt disk (error)")
+}