Add initial code and configuration files for the "Build Your Own <fil…

…l_in_course_name>"

Challenge in Go, Python, and Rust. Uncomment the relevant code in the main files to pass the
first stage. Push the changes to the repository to submit the solution.

solutions/go/01-oq4/code/.gitattributes

@@ -0,0 +1 @@
+* text=auto

solutions/go/01-oq4/code/README.md

@@ -0,0 +1,33 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/<fill_in_course_slug>.png)
+
+This is a starting point for Go solutions to the
+["Build Your Own <fill_in_course_name>" Challenge](https://app.codecrafters.io/courses/<fill_in_course_slug>/overview).
+
+_Add a description of your course here_
+
+**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 `<fill_in_executable_name>` implementation is in
+`cmd/mygrep/main.go`. 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 `go (1.19)` installed locally
+1. Run `./<fill_in_script_name>.sh` to run your program, which is implemented in
+   `cmd/mygrep/main.go`.
+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/go/01-oq4/code/cmd/mygrep/main.go

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+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"unicode/utf8"
+)
+
+// Usage: echo <input_text> | your_grep.sh -E <pattern>
+func main() {
+	if len(os.Args) < 3 || os.Args[1] != "-E" {
+		fmt.Fprintf(os.Stderr, "usage: mygrep -E <pattern>\n")
+		os.Exit(2) // 1 means no lines were selected, >1 means error
+	}
+
+	pattern := os.Args[2]
+
+	line, err := io.ReadAll(os.Stdin) // assume we're only dealing with a single line
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: read input text: %v\n", err)
+		os.Exit(2)
+	}
+
+	ok, err := matchLine(line, pattern)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(2)
+	}
+
+	if !ok {
+		os.Exit(1)
+	}
+
+	// default exit code is 0 which means success
+}
+
+func matchLine(line []byte, pattern string) (bool, error) {
+	if utf8.RuneCountInString(pattern) != 1 {
+		return false, fmt.Errorf("unsupported pattern: %q", pattern)
+	}
+
+	var ok bool
+
+	ok = bytes.ContainsAny(line, pattern)
+
+	return ok, nil
+}

solutions/go/01-oq4/code/codecrafters.yml

@@ -0,0 +1,11 @@
+# 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 Go version used to run your code
+# on Codecrafters.
+#
+# Available versions: go-1.19
+language_pack: go-1.19

solutions/go/01-oq4/code/go.mod

@@ -0,0 +1,11 @@
+// DON'T EDIT THIS!
+//
+// Codecrafters relies on this file being intact to run tests successfully. Any changes
+// here will not reflect when CodeCrafters tests your code, and might even cause build
+// failures.
+//
+// DON'T EDIT THIS!
+
+module github.com/codecrafters-io/grep-starter-go
+
+go 1.16

solutions/go/01-oq4/code/your_grep.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+set -e
+
+tmpFile=$(mktemp)
+
+( cd $(dirname "$0") &&
+	go build -o "$tmpFile" ./cmd/mygrep )
+
+exec "$tmpFile" "$@"

solutions/go/01-oq4/diff/cmd/mygrep/main.go.diff

@@ -0,0 +1,57 @@
+@@ -1,54 +1,49 @@
+ package main
+
+ import (
+-	// Uncomment this to pass the first stage
+-	// "bytes"
++	"bytes"
+ 	"fmt"
+ 	"io"
+ 	"os"
+ 	"unicode/utf8"
+ )
+
+ // Usage: echo <input_text> | your_grep.sh -E <pattern>
+ func main() {
+ 	if len(os.Args) < 3 || os.Args[1] != "-E" {
+ 		fmt.Fprintf(os.Stderr, "usage: mygrep -E <pattern>\n")
+ 		os.Exit(2) // 1 means no lines were selected, >1 means error
+ 	}
+
+ 	pattern := os.Args[2]
+
+ 	line, err := io.ReadAll(os.Stdin) // assume we're only dealing with a single line
+ 	if err != nil {
+ 		fmt.Fprintf(os.Stderr, "error: read input text: %v\n", err)
+ 		os.Exit(2)
+ 	}
+
+ 	ok, err := matchLine(line, pattern)
+ 	if err != nil {
+ 		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+ 		os.Exit(2)
+ 	}
+
+ 	if !ok {
+ 		os.Exit(1)
+ 	}
+
+ 	// default exit code is 0 which means success
+ }
+
+ func matchLine(line []byte, pattern string) (bool, error) {
+ 	if utf8.RuneCountInString(pattern) != 1 {
+ 		return false, fmt.Errorf("unsupported pattern: %q", pattern)
+ 	}
+
+ 	var ok bool
+
+-	// You can use print statements as follows for debugging, they'll be visible when running tests.
+-	fmt.Println("Logs from your program will appear here!")
+-
+-	// Uncomment this to pass the first stage
+-	// ok = bytes.ContainsAny(line, pattern)
++	ok = bytes.ContainsAny(line, pattern)
+
+ 	return ok, nil
+ }

solutions/go/01-oq4/explanation.md

@@ -0,0 +1,21 @@
+The entry point for your writers-stg implementation is in `cmd/mygrep/main.go`.
+
+Study and uncomment the relevant code: 
+
+```go
+// Uncomment this to pass the first stage
+"bytes"
+```
+
+```go
+// Uncomment this to pass the first stage
+ok = bytes.ContainsAny(line, pattern)
+```
+
+Push your changes to pass the first stage:
+
+```
+git add .
+git commit -m "pass 1st stage" # any msg
+git push origin master
+```

solutions/python/01-oq4/code/.gitattributes

@@ -0,0 +1 @@
+* text=auto

solutions/python/01-oq4/code/.gitignore

@@ -0,0 +1,153 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/

solutions/python/01-oq4/code/Pipfile

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# DON'T EDIT THIS!
+#
+# CodeCrafters uses this file to test your code. Don't make any changes here!
+#
+# DON'T EDIT THIS!
+
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+pyparsing = "~=3.0"
+lark = "~=1.1"
+
+[dev-packages]
+
+[requires]
+python_version = "3"