exercism-track-downloader

exercism-track-downloader is a small Clojure (Java) CLI application to download all exercises for track(s) from exercism.org.

exercism-track-downloader.jar [args]

Examples are provided in the usage section.

Pre-requisities

• Exercim's CLI application must be installed as it used to retrieve the exercises.

• Exercises must be unlocked to be downloaded. Locked exercises cannot be downloaded.

Installation

Copy the target/default+uberjar/exercism-track-downloader-<version>-standalone.jar file to somewhere in your PATH and give it executable permissions.

Alternatively, Clojure developers can use the code or library (target/default+uberjar/exercism-track-downloader-<version>.jar) directly.

Usage

Execute commands below from within the root directory. Copy-paste them to your terminal and remove the leading ! character. Note that exercism-track-downloader.jar is symlinked to target/default+uberjar/exercism-track-downloader-1.0-standalone.jar.

Note: All data is retrieved directly from exercism.org on each run

Help

!java -jar exercism-track-downloader.jar --help

NAME:
 exercism-track-downloader - Application to download all exercises from Exercism for any track(s).

USAGE:
 exercism-track-downloader [global-options] command [command options] [arguments...]

VERSION:
 1.0

COMMANDS:
   tracks               List available tracks on Exercism
   exercises            List and download exercises for each track

GLOBAL OPTIONS:
   -?, --help

Tracks

Help

!java -jar exercism-track-downloader.jar tracks --help

NAME:
 exercism-track-downloader tracks - List available tracks on Exercism

USAGE:
 exercism-track-downloader tracks [command options] [arguments...]

EXAMPLES:
 exercism-track-downloader tracks --list
 exercism-track-downloader tracks --slugs
 exercism-track-downloader tracks --langs
 exercism-track-downloader tracks --search ".*L$"

OPTIONS:
   -l, --[no-]list   List both track slugs and language mappings
   -s, --[no-]slugs  List track slugs only
   -g, --[no-]langs  List track languages only
   -r, --search S    Search available track listings using regex
   -?, --help

Listings

!java -jar exercism-track-downloader.jar tracks --list

Retrieving tracks from https://exercism.io/tracks


|           :slug |           :lang |
|-----------------+-----------------|
|            abap |            ABAP |
|             awk |             AWK |
|            bash |            Bash |
|               c |               C |
|            cfml |            CFML |
|         clojure |         Clojure |
|   clojurescript |   ClojureScript |
|           cobol |           COBOL |
|    coffeescript |    CoffeeScript |
|     common-lisp |     Common Lisp |
|             cpp |             C++ |
|         crystal |         Crystal |
|          csharp |              C# |
|               d |               D |
|            dart |            Dart |
|          delphi |   Delphi Pascal |
|          elixir |          Elixir |
|             elm |             Elm |
|      emacs-lisp |      Emacs Lisp |
|          erlang |          Erlang |
|         fortran |         Fortran |
|          fsharp |              F# |
|              go |              Go |
|          groovy |          Groovy |
|         haskell |         Haskell |
|            java |            Java |
|      javascript |      JavaScript |
|           julia |           Julia |
|          kotlin |          Kotlin |
|             lfe |             LFE |
|             lua |             Lua |
|            mips |   MIPS Assembly |
|             nim |             Nim |
|     objective-c |     Objective-C |
|           ocaml |           OCaml |
|           perl5 |          Perl 5 |
| pharo-smalltalk |           Pharo |
|             php |             PHP |
|           plsql |          PL/SQL |
|          prolog |          Prolog |
|      purescript |      PureScript |
|          python |          Python |
|               r |               R |
|          racket |          Racket |
|            raku |            Raku |
|        reasonml |        ReasonML |
|             red |             Red |
|            ruby |            Ruby |
|            rust |            Rust |
|           scala |           Scala |
|          scheme |          Scheme |
|             sml |     Standard ML |
|           swift |           Swift |
|             tcl |             Tcl |
|      typescript |      TypeScript |
|          unison |          Unison |
|           vbnet |          VB.NET |
|       vimscript |      Vim script |
|            wasm |     WebAssembly |
|            wren |            Wren |
| x86-64-assembly | x86-64 Assembly |

Slugs (URL abbreviations) Only

!java -jar exercism-track-downloader.jar tracks --slugs | grep "^c.*"

c
cfml
clojure
clojurescript
cobol
coffeescript
common-lisp
cpp
crystal
csharp

Languages Only

!java -jar exercism-track-downloader.jar tracks --langs | grep ".*ML.*"

CFML
ReasonML
Standard ML

Search Track Listings

!java -jar exercism-track-downloader.jar tracks --search ".*L$"

Retrieving tracks from https://exercism.io/tracks


|    :slug |       :lang |
|----------+-------------|
|     cfml |        CFML |
|    cobol |       COBOL |
|    plsql |      PL/SQL |
| reasonml |    ReasonML |
|      sml | Standard ML |

Exercises

Help

!java -jar exercism-track-downloader.jar exercises --help

NAME:
 exercism-track-downloader exercises - List and download exercises for each track

USAGE:
 exercism-track-downloader exercises [command options] [arguments...]

EXAMPLES:
 exercism-track-downloader exercises --list plsql -l clojure
 exercism-track-downloader exercises --download wasm -d awk

OPTIONS:
   -l, --list S      List exercises for target tracks
   -d, --download S  Download exercises for target tracks
   -?, --help

Listings

!java -jar exercism-track-downloader.jar exercises --list plsql -l WebAssembly

========= plsql =========

|                :title | :difficulty |    :type |
|-----------------------+-------------+----------|
|           Hello World |        easy | tutorial |
|                Binary |        easy | practice |
| Difference Of Squares |        easy | practice |
|            Gigasecond |        easy | practice |
|                Grains |        easy | practice |
|               Hamming |        easy | practice |
|                  Leap |        easy | practice |
|             Nth Prime |        easy | practice |
|             Raindrops |        easy | practice |
|     Rna Transcription |        easy | practice |
|        Roman Numerals |        easy | practice |

========= wasm =========

|                :title | :difficulty |    :type |
|-----------------------+-------------+----------|
|           Hello World |        easy | tutorial |
|                 Darts |        easy | practice |
|    Collatz Conjecture |        easy | practice |
|                Grains |      medium | practice |
| Difference of Squares |        easy | practice |
|                  Leap |        easy | practice |
|        Resistor Color |      medium | practice |
|        Reverse String |        easy | practice |
|               Two Fer |        easy | practice |
|          Bank Account |        easy | practice |
|       Circular Buffer |        hard | practice |
|               Acronym |        easy | practice |
|         All Your Base |      medium | practice |
|         Binary Search |      medium | practice |
|              Triangle |        easy | practice |
|      Nucleotide Count |        easy | practice |
|     Armstrong Numbers |        easy | practice |
|     Rna Transcription |        easy | practice |
|             Raindrops |        easy | practice |
|               Hamming |        easy | practice |
|               Pangram |        easy | practice |

If one ore more tracks are not found it is skipped and a message is displayed

!java -jar exercism-track-downloader.jar exercises --list plsql -l "Web Assembly"

[Web Assembly] not found. See tracks for available options.

========= plsql =========

|                :title | :difficulty |    :type |
|-----------------------+-------------+----------|
|           Hello World |        easy | tutorial |
|                Binary |        easy | practice |
| Difference Of Squares |        easy | practice |
|            Gigasecond |        easy | practice |
|                Grains |        easy | practice |
|               Hamming |        easy | practice |
|                  Leap |        easy | practice |
|             Nth Prime |        easy | practice |
|             Raindrops |        easy | practice |
|     Rna Transcription |        easy | practice |
|        Roman Numerals |        easy | practice |

Download!

Note that only unlocked exercises can be downloaded.

!java -jar exercism-track-downloader.jar exercises --download plsql -d clojure

 ========= plsql =========
You have not unlocked exercise hello-world
You have not unlocked exercise binary
You have not unlocked exercise difference-of-squares
You have not unlocked exercise gigasecond
You have not unlocked exercise grains
You have not unlocked exercise hamming
You have not unlocked exercise leap
You have not unlocked exercise nth-prime
You have not unlocked exercise raindrops
You have not unlocked exercise rna-transcription
You have not unlocked exercise roman-numerals

 ========= clojure =========
Downloaded exercise hello-world
Downloaded exercise lucians-luscious-lasagna
Downloaded exercise tracks-on-tracks-on-tracks
Downloaded exercise bird-watcher
Downloaded exercise cars-assemble
Downloaded exercise interest-is-interesting
Downloaded exercise annalyns-infiltration
Downloaded exercise log-levels
Downloaded exercise elyses-destructured-enchantments
Downloaded exercise two-fer
Downloaded exercise armstrong-numbers
Downloaded exercise reverse-string
Downloaded exercise accumulate
Downloaded exercise acronym
Downloaded exercise all-your-base
Downloaded exercise anagram
Downloaded exercise bob
Downloaded exercise collatz-conjecture
Downloaded exercise complex-numbers
Downloaded exercise etl
Downloaded exercise hamming
Downloaded exercise nth-prime
Downloaded exercise nucleotide-count
Downloaded exercise pangram
Downloaded exercise pig-latin
Downloaded exercise protein-translation
Downloaded exercise raindrops
Downloaded exercise rna-transcription
Downloaded exercise robot-name
Downloaded exercise roman-numerals
Downloaded exercise rotational-cipher
Downloaded exercise run-length-encoding
Downloaded exercise scrabble-score
Downloaded exercise secret-handshake
Downloaded exercise series
Downloaded exercise space-age
Downloaded exercise strain
Downloaded exercise sublist
Downloaded exercise sum-of-multiples
Downloaded exercise triangle
Downloaded exercise word-count
Downloaded exercise atbash-cipher
Downloaded exercise beer-song
Downloaded exercise binary
Downloaded exercise binary-search
Downloaded exercise binary-search-tree
Downloaded exercise change
Downloaded exercise flatten-array
Downloaded exercise gigasecond
Downloaded exercise grade-school
Downloaded exercise grains
Downloaded exercise hexadecimal
Downloaded exercise isbn-verifier
Downloaded exercise isogram
Downloaded exercise kindergarten-garden
Downloaded exercise leap
Downloaded exercise pascals-triangle
Downloaded exercise perfect-numbers
Downloaded exercise phone-number
Downloaded exercise prime-factors
Downloaded exercise proverb
Downloaded exercise say
Downloaded exercise trinary
Downloaded exercise allergies
Downloaded exercise crypto-square
Downloaded exercise difference-of-squares
Downloaded exercise dominoes
Downloaded exercise largest-series-product
Downloaded exercise meetup
Downloaded exercise octal
Downloaded exercise spiral-matrix
Downloaded exercise clock
Downloaded exercise diamond
Downloaded exercise luhn
Downloaded exercise sieve

Speeding up Execution

(Slow) Time of Standalone Executable

The startup time is slow due to Clojure's slow loading time. The execution time might be also be slow as data is retrieved directly from exercism.org and parsed every time the application is run.

!time java -jar exercism-track-downloader.jar tracks --search "^.*c"

!time java -jar exercism-track-downloader.jar exercises --list plsql

Drip

One option to significantly increase the speed of startup is by using an application like drip.

!time drip -jar exercism-track-downloader.jar tracks --search "^.*c"

Retrieving tracks from https://exercism.io/tracks


|       :slug |       :lang |
|-------------+-------------|
|           c |           C |
| objective-c | Objective-C |

drip -jar exercism-track-downloader.jar tracks --search "^.*c"  0.06s user 0.08s system 61% cpu 0.225 total

!time drip -jar exercism-track-downloader.jar exercises --list plsql

========= plsql =========

|                :title | :difficulty |    :type |
|-----------------------+-------------+----------|
|           Hello World |        easy | tutorial |
|                Binary |        easy | practice |
| Difference Of Squares |        easy | practice |
|            Gigasecond |        easy | practice |
|                Grains |        easy | practice |
|               Hamming |        easy | practice |
|                  Leap |        easy | practice |
|             Nth Prime |        easy | practice |
|             Raindrops |        easy | practice |
|     Rna Transcription |        easy | practice |
|        Roman Numerals |        easy | practice |

drip -jar exercism-track-downloader.jar exercises --list plsql  0.06s user 0.08s system 15% cpu 0.879 total