| --- |
| license: other |
| license_name: mixed-permissive |
| license_link: LICENSE |
| task_categories: |
| - text-generation |
| language: |
| - en |
| - gle |
| tags: |
| - code |
| - gleam |
| - programming-language |
| - corpus |
| - code-generation |
| size_categories: |
| - 10K<n<100K |
| --- |
| |
| # Gleam Code Corpus |
|
|
| A structured, attributed corpus of **22,581 Gleam source files** collected from **1,528 GitHub repositories** for continued pre-training and code generation research. |
|
|
| ## Overview |
|
|
| This dataset contains `.gleam` source files from the [Gleam](https://gleam.run/) programming language ecosystem. Every file includes full attribution — repo owner, name, URL, license, star count, and Hex.pm package metadata where available. |
|
|
| **What this is for:** |
| - Continued pre-training (CPT) of code-focused language models |
| - Fine-tuning models for Gleam code generation |
| - Research on small programming language ecosystems |
| - Reference corpus for Gleam idioms and patterns |
|
|
| **What this is NOT:** |
| - Instruction/response pairs (see the companion `gleam-sft` dataset, coming later) |
| - Documentation (language tour, hexdocs — separate dataset, coming later) |
| - Raw/unfiltered data (generated files, unlicensed code, and duplicates have been removed) |
|
|
| ## Dataset Configs |
|
|
| | Config | Files | Size | Description | |
| |--------|-------|------|-------------| |
| | `all` | 22,581 | 27 MB | Full filtered corpus | |
| | `official` | 296 | 422 KB | Official repos only (`gleam-lang`, `gleam-wisp`, `lustre-labs`) | |
| | `community_top` | 6,702 | 8 MB | Community repos with stars ≥ 10 or Hex downloads ≥ 1,000 | |
|
|
| All configs contain only permissively licensed, deduplicated code. |
|
|
| ## Schema |
|
|
| Each record is a single `.gleam` file with full attribution: |
|
|
| | Field | Type | Description | |
| |-------|------|-------------| |
| | `id` | string | `{owner}/{repo}/{file_path}` — unique identifier | |
| | `source` | string | Always `"github"` | |
| | `code` | string | Raw file contents | |
| | `file_path` | string | Path within the repository | |
| | `repo_url` | string | GitHub repository URL | |
| | `repo_owner` | string | Repository owner/organization | |
| | `repo_name` | string | Repository name | |
| | `repo_description` | string | Repository description from GitHub | |
| | `stars` | int | GitHub star count at collection time | |
| | `is_official` | bool | True if owner is `gleam-lang`, `gleam-wisp`, or `lustre-labs` | |
| | `license` | string | Normalized SPDX license identifier | |
| | `license_raw` | string | Original license string from source | |
| | `authors` | list[string] | Repository authors/contributors | |
| | `hex_package` | string? | Hex.pm package name (null if not on Hex) | |
| | `hex_downloads` | int? | Hex.pm download count (null if not on Hex) | |
| | `fork` | bool | Whether the repo is a fork (unreliable — see notes) | |
| | `archived` | bool | Whether the repo is archived | |
| | `collected_at` | string | ISO 8601 timestamp of collection | |
| | `commit_sha` | string | Git commit SHA of the snapshot | |
| | `schema_version` | int | Schema version (currently 1) | |
|
|
| ## Collection Methodology |
|
|
| 1. **Discovery**: GitHub search API with `language:gleam`, using star-range + date-range chunking to bypass the 1,000-result-per-query limit. Discovered 4,660 unique repositories across 17 query chunks. |
|
|
| 2. **Enrichment**: Cross-referenced with Hex.pm `search=gleam` (1,035 packages) to add package names and download counts. |
|
|
| 3. **Collection**: Shallow-cloned each repo (`git clone --depth 1`), extracted all `.gleam` files. 4,489 repos processed, 0 clone failures. |
|
|
| 4. **Filtering**: Applied a multi-stage quality pipeline: |
|
|
| | Filter | Removed | Reason | |
| |--------|---------|--------| |
| | Generated files (>50K chars) | 666 | Auto-generated schemas, lookup tables, data dumps | |
| | Stub files (<20 chars) | 316 | Empty/placeholder files | |
| | Unlicensed repos | 42,368 | No license and no Hex package | |
| | Non-permissive licenses | 0 | GPL, AGPL removed | |
| | Exercism repos | 840 | Same exercises solved repeatedly — low diversity | |
| | Content deduplication | 2,642 | Identical code from different repos (kept highest-starred) | |
|
|
| **69,413 raw files → 22,581 clean files** (67% reduction) |
|
|
| ## Statistics |
|
|
| ### Corpus |
| - **22,581 files** from **1,528 repos** |
| - **4.3M lines**, **121M characters** |
| - Median file: 2,692 chars; Mean: 5,352 chars; Max: 49,945 chars |
|
|
| ### License Distribution |
| - MIT: 57% (13,068 files) |
| - Apache-2.0: 40% (8,723 files) |
| - Other permissive: 3% (MPL-2.0, BSD, ISC, Unlicense, 0BSD, CC0-1.0) |
|
|
| ### Source Distribution |
| - `src/` files: 48% |
| - `test/` files: 24% |
| - `examples/` files: 6% |
| - Other: 22% |
|
|
| ### Star Distribution |
| | Stars | Files | % | |
| |-------|-------|---| |
| | 0 | 6,904 | 31% | |
| | 1–4 | 6,842 | 30% | |
| | 5–9 | 3,432 | 15% | |
| | 10–49 | 3,602 | 16% | |
| | 50–99 | 757 | 3.4% | |
| | 100–999 | 918 | 4.1% | |
| | 1000+ | 126 | 0.6% | |
|
|
| ## Known Limitations |
|
|
| - **`fork` field is unreliable**: GitHub search API doesn't consistently mark forks. All records show `fork=false`. Some near-duplicate fork content may be present (content dedup catches exact copies only). |
| - **Near-duplicate forks**: Diverged forks (e.g., `Ivan-Vakhula07/lustre` vs `lustre-labs/lustre`) survived dedup because their files differ slightly. These are valid Gleam code and not harmful for training. |
| - **Semi-generated content**: `dusty-phillips/monks_of_style` contributes 496 files (2.2%) of auto-generated CSS property wrappers from MDN documentation. Each file is valid Gleam but follows an identical template. |
| - **Hex.pm enrichment incomplete**: Only 44% of files (10,015) have Hex package metadata. The rest are from repos not published on Hex. |
| - **Collection snapshot**: Data was collected on 2026-05-28. Repositories may have changed since. |
|
|
| ## Licensing |
|
|
| This dataset aggregates code from many repositories, each with their own license. The `license` field in each record contains the normalized SPDX identifier. All included code is under permissive licenses: |
|
|
| - MIT |
| - Apache-2.0 |
| - MPL-2.0 |
| - BSD-3-Clause |
| - BSD-2-Clause |
| - ISC |
| - Unlicense |
| - 0BSD |
| - CC0-1.0 |
|
|
| The dataset card and curation scripts are released under the same license terms as the underlying code. See individual records for specific license attribution. |
|
|
| ## How to Use |
|
|
| ```python |
| from datasets import load_dataset |
| |
| # Load full corpus |
| ds = load_dataset("kasuboski/gleam-code-corpus", config="all") |
| |
| # Load only official Gleam repos |
| ds = load_dataset("kasuboski/gleam-code-corpus", config="official") |
| |
| # Load community top (stars >= 10 or hex_downloads >= 1000) |
| ds = load_dataset("kasuboski/gleam-code-corpus", config="community_top") |
| |
| # Access a record |
| record = ds["train"][0] |
| print(record["code"]) # the Gleam source code |
| print(record["repo_url"]) # GitHub URL for attribution |
| print(record["license"]) # SPDX license identifier |
| ``` |
|
|
| ## Acknowledgments |
|
|
| - The [Gleam](https://gleam.run/) language team and community |
| - [Hex.pm](https://hex.pm/) for package metadata |
| - All the repository authors whose code is included in this corpus |
|
|
