feat: add gleam support to grep challenge

compiled_starters/gleam/.gitattributes

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+* text=auto

compiled_starters/gleam/.gitignore

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

compiled_starters/gleam/README.md

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+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/grep.png)
+
+This is a starting point for Gleam solutions to the
+["Build Your Own grep" Challenge](https://app.codecrafters.io/courses/grep/overview).
+
+[Regular expressions](https://en.wikipedia.org/wiki/Regular_expression)
+(Regexes, for short) are patterns used to match character combinations in
+strings. [`grep`](https://en.wikipedia.org/wiki/Grep) is a CLI tool for
+searching using Regexes.
+
+In this challenge you'll build your own implementation of `grep`. Along the way
+we'll learn about Regex syntax, how parsers/lexers work, and how regular
+expressions are evaluated.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your `grep` implementation is in `src/grep.gleam`. Study and
+uncomment the relevant code, and push your changes to pass the first stage:
+
+```sh
+git add .
+git commit -m "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `gleam (1.0)` installed locally
+1. Run `./your_grep.sh` to run your program, which is implemented in
+   `src/grep.gleam`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

compiled_starters/gleam/codecrafters.yml

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+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Gleam version used to run your code
+# on Codecrafters.
+#
+# Available versions: gleam-1.0
+language_pack: gleam-1.0

compiled_starters/gleam/gleam.toml

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+name = "grep"
+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_erlang = "~> 0.25"
+gleam_stdlib = "~> 0.34 or ~> 1.0"
+argv = ">= 1.0.2 and < 2.0.0"
+file_streams = ">= 0.4.2 and < 1.0.0"
+
+[dev-dependencies]
+gleeunit = "~> 1.0"

compiled_starters/gleam/manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_erlang", version = "0.25.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "054D571A7092D2A9727B3E5D183B7507DAB0DA41556EC9133606F09C15497373" },
+  { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+  { name = "file_streams", version = "0.4.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "file_streams", source = "hex", outer_checksum = "86775D2F36B74C54C64CA9080ACA9B9CF4655759E8D3E87E1A2EA9B0FA8D0804" },
+  { name = "gleam_stdlib", version = "0.37.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "5398BD6C2ABA17338F676F42F404B9B7BABE1C8DC7380031ACB05BBE1BCF3742" },
+  { name = "gleeunit", version = "1.1.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "72CDC3D3F719478F26C4E2C5FED3E657AC81EC14A47D2D2DEBB8693CA3220C3B" },
+]
+
+[requirements]
+argv = { version = ">= 1.0.2 and < 2.0.0" }
+gleam_erlang = { version = "~> 0.25" }
+file_streams = { version = ">= 0.4.2 and < 1.0.0" }
+gleam_stdlib = { version = "~> 0.34 or ~> 1.0" }
+gleeunit = { version = "~> 1.0" }

compiled_starters/gleam/src/grep.gleam

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+import argv
+import gleam/io
+import gleam/string
+import gleam/erlang
+
+pub fn main() {
+  // You can use print statements as follows for debugging, they'll be visible when running tests.
+  io.println("Logs from your program will appear here!")
+
+  // Uncomment this to pass the first stage
+  // let args = argv.load().arguments
+  // let assert Ok(input_line) = erlang.get_line("")
+  // case args {
+  //  ["-E", pattern, ..] -> {
+  //      case match_pattern(input_line, pattern) {
+  //          True -> exit(0)
+  //           False -> exit(1)
+  //         }
+  //    io.println("Success")
+  //   }
+  //   _ -> {
+  //     io.println("Expected first argument to be '-E'")
+  //   }
+  // }
+}
+
+fn match_pattern(input_line: String, pattern: String) -> Bool {
+    case string.length(pattern) {
+      1 -> string.contains(input_line, pattern)
+      _ -> {
+        io.println("Unhandled pattern: " <> pattern)
+        False
+      }
+    }
+}
+
+@external(erlang, "erlang", "halt")
+pub fn exit(code: Int) -> Int

compiled_starters/gleam/your_grep.sh

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+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+exec gleam run -- "$@"

dockerfiles/gleam-1.0.Dockerfile

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+FROM ghcr.io/gleam-lang/gleam:v1.0.0-erlang-alpine
+
+# Pre-compile steps
+RUN printf "cd \${CODECRAFTERS_SUBMISSION_DIR} && gleam build" > /codecrafters-precompile.sh
+RUN chmod +x /codecrafters-precompile.sh

solutions/gleam/01-cq2/code/.gitattributes

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+* text=auto

solutions/gleam/01-cq2/code/.gitignore

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

solutions/gleam/01-cq2/code/README.md

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+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/grep.png)
+
+This is a starting point for Gleam solutions to the
+["Build Your Own grep" Challenge](https://app.codecrafters.io/courses/grep/overview).
+
+[Regular expressions](https://en.wikipedia.org/wiki/Regular_expression)
+(Regexes, for short) are patterns used to match character combinations in
+strings. [`grep`](https://en.wikipedia.org/wiki/Grep) is a CLI tool for
+searching using Regexes.
+
+In this challenge you'll build your own implementation of `grep`. Along the way
+we'll learn about Regex syntax, how parsers/lexers work, and how regular
+expressions are evaluated.
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your `grep` implementation is in `src/grep.gleam`. Study and
+uncomment the relevant code, and push your changes to pass the first stage:
+
+```sh
+git add .
+git commit -m "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `gleam (1.0)` installed locally
+1. Run `./your_grep.sh` to run your program, which is implemented in
+   `src/grep.gleam`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.

solutions/gleam/01-cq2/code/codecrafters.yml

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+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Gleam version used to run your code
+# on Codecrafters.
+#
+# Available versions: gleam-1.0
+language_pack: gleam-1.0

solutions/gleam/01-cq2/code/gleam.toml

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+name = "grep"
+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_erlang = "~> 0.25"
+gleam_stdlib = "~> 0.34 or ~> 1.0"
+argv = ">= 1.0.2 and < 2.0.0"
+file_streams = ">= 0.4.2 and < 1.0.0"
+
+[dev-dependencies]
+gleeunit = "~> 1.0"

solutions/gleam/01-cq2/code/manifest.toml

@@ -0,0 +1,17 @@
+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_erlang", version = "0.25.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "054D571A7092D2A9727B3E5D183B7507DAB0DA41556EC9133606F09C15497373" },
+  { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+  { name = "file_streams", version = "0.4.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "file_streams", source = "hex", outer_checksum = "86775D2F36B74C54C64CA9080ACA9B9CF4655759E8D3E87E1A2EA9B0FA8D0804" },
+  { name = "gleam_stdlib", version = "0.37.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "5398BD6C2ABA17338F676F42F404B9B7BABE1C8DC7380031ACB05BBE1BCF3742" },
+  { name = "gleeunit", version = "1.1.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "72CDC3D3F719478F26C4E2C5FED3E657AC81EC14A47D2D2DEBB8693CA3220C3B" },
+]
+
+[requirements]
+argv = { version = ">= 1.0.2 and < 2.0.0" }
+gleam_erlang = { version = "~> 0.25" }
+file_streams = { version = ">= 0.4.2 and < 1.0.0" }
+gleam_stdlib = { version = "~> 0.34 or ~> 1.0" }
+gleeunit = { version = "~> 1.0" }

solutions/gleam/01-cq2/code/src/grep.gleam

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+import argv
+import gleam/io
+import gleam/string
+import gleam/erlang
+
+pub fn main() {
+  let args = argv.load().arguments
+  let assert Ok(input_line) = erlang.get_line("")
+  case args {
+   ["-E", pattern, ..] -> {
+       case match_pattern(input_line, pattern) {
+           True -> exit(0)
+            False -> exit(1)
+          }
+     io.println("Success")
+    }
+    _ -> {
+      io.println("Expected first argument to be '-E'")
+    }
+  }
+}
+
+fn match_pattern(input_line: String, pattern: String) -> Bool {
+    case string.length(pattern) {
+      1 -> string.contains(input_line, pattern)
+      _ -> {
+        io.println("Unhandled pattern: " <> pattern)
+        False
+      }
+    }
+}
+
+@external(erlang, "erlang", "halt")
+pub fn exit(code: Int) -> Int

solutions/gleam/01-cq2/code/your_grep.sh

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+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+exec gleam run -- "$@"

solutions/gleam/01-cq2/diff/src/grep.gleam.diff

@@ -0,0 +1,53 @@
+@@ -1,38 +1,34 @@
+ import argv
+ import gleam/io
+ import gleam/string
+ import gleam/erlang
+
+ pub fn main() {
+-  // You can use print statements as follows for debugging, they'll be visible when running tests.
+-  io.println("Logs from your program will appear here!")
+-
+-  // Uncomment this to pass the first stage
+-  // let args = argv.load().arguments
+-  // let assert Ok(input_line) = erlang.get_line("")
+-  // case args {
+-  //  ["-E", pattern, ..] -> {
+-  //      case match_pattern(input_line, pattern) {
+-  //          True -> exit(0)
+-  //           False -> exit(1)
+-  //         }
+-  //    io.println("Success")
+-  //   }
+-  //   _ -> {
+-  //     io.println("Expected first argument to be '-E'")
+-  //   }
+-  // }
++  let args = argv.load().arguments
++  let assert Ok(input_line) = erlang.get_line("")
++  case args {
++   ["-E", pattern, ..] -> {
++       case match_pattern(input_line, pattern) {
++           True -> exit(0)
++            False -> exit(1)
++          }
++     io.println("Success")
++    }
++    _ -> {
++      io.println("Expected first argument to be '-E'")
++    }
++  }
+ }
+
+ fn match_pattern(input_line: String, pattern: String) -> Bool {
+     case string.length(pattern) {
+       1 -> string.contains(input_line, pattern)
+       _ -> {
+         io.println("Unhandled pattern: " <> pattern)
+         False
+       }
+     }
+ }
+
+ @external(erlang, "erlang", "halt")
+ pub fn exit(code: Int) -> Int

solutions/gleam/01-cq2/explanation.md

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+The entry point for your grep implementation is in `src/grep.gleam`.
+
+Study and uncomment the relevant code: 
+
+```gleam
+// Uncomment this to pass the first stage
+let args = argv.load().arguments
+let assert Ok(input_line) = erlang.get_line("")
+case args {
+ ["-E", pattern, ..] -> {
+     case match_pattern(input_line, pattern) {
+         True -> exit(0)
+          False -> exit(1)
+        }
+   io.println("Success")
+  }
+  _ -> {
+    io.println("Expected first argument to be '-E'")
+  }
+}
+```
+
+Push your changes to pass the first stage:
+
+```
+git add .
+git commit -m "pass 1st stage" # any msg
+git push origin master
+```