Add Clojure

compiled_starters/clojure/.codecrafters/compile.sh

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+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure

compiled_starters/clojure/.codecrafters/install.sh

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+#!/usr/bin/env sh
+
+set -e # Exit on failure
+echo "Downloading babashka"
+curl -L -o babashka.tar.gz https://github.com/babashka/babashka/releases/download/v1.12.200/babashka-1.12.200-linux-amd64-static.tar.gz
+
+echo "Unpacking babashka"
+tar -xzf babashka.tar.gz
+
+echo "Installing babashka"
+mv bb /usr/local/bin/
+chmod +x /usr/local/bin/bb
+
+echo "Cleaning up"
+rm babashka.tar.gz
+
+echo "babashka installed successfully!"

compiled_starters/clojure/.codecrafters/run.sh

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+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+bb -m sqlite.core "$@"

compiled_starters/clojure/.gitattributes

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+* text=auto

compiled_starters/clojure/.gitignore

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+# Database files used for testing
+*.db
+
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/lib/
+/classes/
+/target/
+/checkouts/
+.lein-deps-sum
+.lein-repl-history
+.lein-plugins/
+.lein-failures
+.nrepl-port
+.cpcache/
+deps/

compiled_starters/clojure/README.md

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+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/sqlite.png)
+
+This is a starting point for Clojure solutions to the
+["Build Your Own SQLite" Challenge](https://codecrafters.io/challenges/sqlite).
+
+In this challenge, you'll build a barebones SQLite implementation that supports
+basic SQL queries like `SELECT`. Along the way we'll learn about
+[SQLite's file format](https://www.sqlite.org/fileformat.html), how indexed data
+is
+[stored in B-trees](https://jvns.ca/blog/2014/10/02/how-does-sqlite-work-part-2-btrees/)
+and more.
+
+**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 SQLite implementation is in `src/sqlite/core.clj`.
+Study and uncomment the relevant code, and push your changes to pass the first
+stage:
+
+```sh
+git commit -am "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 `bb` installed locally
+1. Run `./your_program.sh` to run your program, which is implemented in
+   `src/sqlite/core.clj`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
+
+# Sample Databases
+
+To make it easy to test queries locally, we've added a sample database in the
+root of this repository: `sample.db`.
+
+This contains two tables: `apples` & `oranges`. You can use this to test your
+implementation for the first 6 stages.
+
+You can explore this database by running queries against it like this:
+
+```sh
+$ sqlite3 sample.db "select id, name from apples"
+1|Granny Smith
+2|Fuji
+3|Honeycrisp
+4|Golden Delicious
+```
+
+There are two other databases that you can use:
+
+1. `superheroes.db`:
+   - This is a small version of the test database used in the table-scan stage.
+   - It contains one table: `superheroes`.
+   - It is ~1MB in size.
+1. `companies.db`:
+   - This is a small version of the test database used in the index-scan stage.
+   - It contains one table: `companies`, and one index: `idx_companies_country`
+   - It is ~7MB in size.
+
+These aren't included in the repository because they're large in size. You can
+download them by running this script:
+
+```sh
+./download_sample_databases.sh
+```
+
+If the script doesn't work for some reason, you can download the databases
+directly from
+[codecrafters-io/sample-sqlite-databases](https://github.com/codecrafters-io/sample-sqlite-databases).

compiled_starters/clojure/bb.edn

@@ -0,0 +1 @@
+{:paths ["src" "resources"]}

compiled_starters/clojure/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 Clojure version used to run your code
+# on Codecrafters.
+#
+# Available versions: clojure-1.12.0
+language_pack: clojure-1.12.0

compiled_starters/clojure/download_sample_databases.sh

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+#!/bin/sh
+
+echo "Downloading superheroes.db: ~1MB (used in stage 7)"
+curl -Lo superheroes.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/superheroes.db
+
+echo "Downloading companies.db: ~7MB (used in stage 8)"
+curl -Lo companies.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/companies.db
+
+echo "Sample databases downloaded."

compiled_starters/clojure/src/sqlite/core.clj

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+(ns sqlite.core
+  (:gen-class)
+  (:require
+   [clojure.java.io :as io]))
+
+(defn lazy-byte-seq [filepath]
+  (let [is (io/input-stream filepath)
+        step (fn step [input-stream]
+               (lazy-seq
+                (let [byte-val (.read input-stream)]
+                  (when (not= byte-val -1)
+                    (cons byte-val (step input-stream))))))]
+    (step is)))
+
+(defn bytes-to-int [bytes]
+  (reduce (fn [acc b] (+ (* acc 256) b)) 0 bytes))
+
+(defn -main [& args]
+  ;; You can use print statements as follows for debugging, they'll be visible when running tests.
+  (println "Logs from your program will appear here!")
+
+  ;; Uncomment this block to pass the first stage
+  ;; (let [command (second args)]
+  ;;   (case command
+  ;;     ".dbinfo"
+  ;;     (let [db-file-path (first args)
+  ;;           contents (lazy-byte-seq db-file-path)
+  ;;           page-size (bytes-to-int (take 2 (drop 16 contents)))]
+  ;;       (println (str "database page size: " page-size)))))
+  )

compiled_starters/clojure/your_program.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# Use this script to run your program LOCALLY.
+#
+# Note: Changing this script WILL NOT affect how CodeCrafters runs your program.
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit early if any commands fail
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+bb -m sqlite.core "$@"

dockerfiles/clojure-1.12.0.Dockerfile

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+# syntax=docker/dockerfile:1.7-labs
+FROM clojure:tools-deps-bookworm
+
+# Ensures the container is re-built if dependency files change
+ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="deps.edn"
+
+WORKDIR /app
+
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+# Install language-specific dependencies
+RUN .codecrafters/install.sh

solutions/clojure/01-dr6/code/.codecrafters/compile.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure

solutions/clojure/01-dr6/code/.codecrafters/install.sh

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+#!/usr/bin/env sh
+
+set -e # Exit on failure
+echo "Downloading babashka"
+curl -L -o babashka.tar.gz https://github.com/babashka/babashka/releases/download/v1.12.200/babashka-1.12.200-linux-amd64-static.tar.gz
+
+echo "Unpacking babashka"
+tar -xzf babashka.tar.gz
+
+echo "Installing babashka"
+mv bb /usr/local/bin/
+chmod +x /usr/local/bin/bb
+
+echo "Cleaning up"
+rm babashka.tar.gz
+
+echo "babashka installed successfully!"

solutions/clojure/01-dr6/code/.codecrafters/run.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+bb -m sqlite.core "$@"

solutions/clojure/01-dr6/code/.gitattributes

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

solutions/clojure/01-dr6/code/.gitignore

@@ -0,0 +1,18 @@
+# Database files used for testing
+*.db
+
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/lib/
+/classes/
+/target/
+/checkouts/
+.lein-deps-sum
+.lein-repl-history
+.lein-plugins/
+.lein-failures
+.nrepl-port
+.cpcache/
+deps/

solutions/clojure/01-dr6/code/README.md

@@ -0,0 +1,77 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/sqlite.png)
+
+This is a starting point for Clojure solutions to the
+["Build Your Own SQLite" Challenge](https://codecrafters.io/challenges/sqlite).
+
+In this challenge, you'll build a barebones SQLite implementation that supports
+basic SQL queries like `SELECT`. Along the way we'll learn about
+[SQLite's file format](https://www.sqlite.org/fileformat.html), how indexed data
+is
+[stored in B-trees](https://jvns.ca/blog/2014/10/02/how-does-sqlite-work-part-2-btrees/)
+and more.
+
+**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 SQLite implementation is in `src/sqlite/core.clj`.
+Study and uncomment the relevant code, and push your changes to pass the first
+stage:
+
+```sh
+git commit -am "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 `bb` installed locally
+1. Run `./your_program.sh` to run your program, which is implemented in
+   `src/sqlite/core.clj`.
+1. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
+
+# Sample Databases
+
+To make it easy to test queries locally, we've added a sample database in the
+root of this repository: `sample.db`.
+
+This contains two tables: `apples` & `oranges`. You can use this to test your
+implementation for the first 6 stages.
+
+You can explore this database by running queries against it like this:
+
+```sh
+$ sqlite3 sample.db "select id, name from apples"
+1|Granny Smith
+2|Fuji
+3|Honeycrisp
+4|Golden Delicious
+```
+
+There are two other databases that you can use:
+
+1. `superheroes.db`:
+   - This is a small version of the test database used in the table-scan stage.
+   - It contains one table: `superheroes`.
+   - It is ~1MB in size.
+1. `companies.db`:
+   - This is a small version of the test database used in the index-scan stage.
+   - It contains one table: `companies`, and one index: `idx_companies_country`
+   - It is ~7MB in size.
+
+These aren't included in the repository because they're large in size. You can
+download them by running this script:
+
+```sh
+./download_sample_databases.sh
+```
+
+If the script doesn't work for some reason, you can download the databases
+directly from
+[codecrafters-io/sample-sqlite-databases](https://github.com/codecrafters-io/sample-sqlite-databases).

solutions/clojure/01-dr6/code/bb.edn

@@ -0,0 +1 @@
+{:paths ["src" "resources"]}

solutions/clojure/01-dr6/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 Clojure version used to run your code
+# on Codecrafters.
+#
+# Available versions: clojure-1.12.0
+language_pack: clojure-1.12.0

solutions/clojure/01-dr6/code/download_sample_databases.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+echo "Downloading superheroes.db: ~1MB (used in stage 7)"
+curl -Lo superheroes.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/superheroes.db
+
+echo "Downloading companies.db: ~7MB (used in stage 8)"
+curl -Lo companies.db https://raw.githubusercontent.com/codecrafters-io/sample-sqlite-databases/master/companies.db
+
+echo "Sample databases downloaded."