log-levels

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