Add JuliaFormatter and update the README

.JuliaFormatter.toml

@@ -0,0 +1,9 @@
+# Configuration file for JuliaFormatter.jl
+# For more information, see: https://domluna.github.io/JuliaFormatter.jl/stable/config/
+
+always_for_in = true
+always_use_return = true
+margin = 80
+remove_extra_newlines = true
+separate_kwargs_with_semicolon = true
+short_to_long_function_def = true

.github/dependabot.yml

@@ -0,0 +1,7 @@
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

@@ -1,9 +1,7 @@
 name: CI
 on:
   push:
-    branches:
-      - main
-      - release-*
+    branches: [main]
   pull_request:
     types: [opened, synchronize, reopened]
 # needed to allow julia-actions/cache to delete old caches that it has created
@@ -17,29 +15,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Only test on a subset of possible platforms.
-        include:
-          - version: '1'  # The latest point-release (Linux)
-            os: ubuntu-latest
-            arch: x64
-          - version: '1'  # The latest point-release (Windows)
-            os: windows-latest
-            arch: x64
-          - version: '1.10'  # 1.10 LTS (64-bit Linux)
-            os: ubuntu-latest
-            arch: x64
-          - version: '1.10'  # 1.10 LTS (64-bit Windows)
-            os: windows-latest
-            arch: x64
-          - version: '1.10'  # 1.10 LTS (64-bit Mac Intel)
-            os: macos-15-intel
-            arch: x64
-          - version: '1.10'  # 1.10 LTS (64-bit Mac Arm)
-            os: macOS-latest
-            arch: arm64
+        version: ['1.10', '1']
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+        arch: [default]
     steps:
       - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}

.github/workflows/format_check.yml

@@ -0,0 +1,29 @@
+name: format-check
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: '1'
+      - uses: actions/checkout@v6
+      - name: Format check
+        shell: julia --color=yes {0}
+        run: |
+          using Pkg
+          Pkg.add(PackageSpec(name="JuliaFormatter", version="2"))
+          using JuliaFormatter
+          format(".", verbose=true)
+          out = String(read(Cmd(`git diff`)))
+          if isempty(out)
+              exit(0)
+          end
+          @error "Some files have not been formatted !!!"
+          write(stdout, out)
+          exit(1)

README.md

@@ -1,37 +1,45 @@
 # GDXInterface.jl
 
-High-level Julia interface for reading and writing
-[GDX files](https://gams-dev.github.io/gdx/index.html)
-(GAMS Data Exchange).
+[![Build Status](https://github.com/jd-foster/GDXInterface.jl/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/jd-foster/GDXInterface.jl/actions?query=workflow%3ACI)
+[![codecov](https://codecov.io/gh/jd-foster/GDXInterface.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/jd-foster/GDXInterface.jl)
 
-Uses the [`gdx_jll`](https://github.com/JuliaBinaryWrappers/gdx_jll.jl.git) package to
-provide the GDX C library independently of GAMS.
-
-**No GAMS installation required.**
+[GDXInterface.jl](https://github.com/jd-foster/GDXInterface.jl) is an unofficial
+wrapper for [gams-dev/gdx](http://github.com/gams-dev/gdx), which provides
+support for reading and writing [GDX (GAMS Data Exchange) files](https://gams-dev.github.io/gdx/index.html).
 
 For more information on the GDX file format, see the blog post
-['GDX source code published on GitHub'](https://www.gams.com/blog/2023/12/gdx-source-code-published-on-github/).
+[GDX source code published on GitHub](https://www.gams.com/blog/2023/12/gdx-source-code-published-on-github/).
 
-## Installation
+## Affiliation
 
-```julia
-using Pkg
-Pkg.add(url="https://github.com/jd-foster/GDXInterface.jl.git")
-```
+This package is an unofficial Julia wrapper of [gams-dev/gdx](https://github.com/gams-dev/gdx).
+It is developed and maintained by the JuMP community. It is not an official
+product by [GAMS](https://gams.com).
 
-Or in the Pkg REPL:
+## Getting help
 
-```
-pkg> add https://github.com/jd-foster/GDXInterface.jl.git
-```
+If you need help, please ask a question on the [JuMP community forum](https://jump.dev/forum).
 
-Run tests with:
+If you have a reproducible example of a bug, please [open a GitHub issue](https://github.com/jd-foster/GDXInterface.jl/issues/new).
 
-```
-pkg> test GDXInterface
+## License
+
+`GDXInterface.jl` is licensed under the [MIT License](https://github.com/jd-foster/GDXInterface.jl/blob/main/LICENSE.md).
+
+`GDXInterface.jl` wraps the [official GAMS GDX project](https://github.com/GAMS-dev/gdx),
+which is also licensed under the [MIT License](https://github.com/GAMS-dev/gdx/blob/main/LICENSE).
+You do not need a GAMS license to use `GDXInterface.jl`.
+
+## Installation
+
+Install `GDXInterface.jl` as follows:
+
+```julia
+using Pkg
+Pkg.add(; url = "https://github.com/jd-foster/GDXInterface.jl.git")
 ```
 
-These instructions will be updated if/when the package is registered.
+You do not need a GAMS installation to use `GDXInterface.jl`.
 
 ## Quick Start
 
@@ -141,13 +149,13 @@ for (k, v) in gdx ...    # iterate over symbols
 
 GAMS special values are mapped to Julia equivalents when reading:
 
-| GAMS | Julia | Notes |
-|------|-------|-------|
-| `UNDEF` | `NaN` | Undefined value |
-| `NA` | `NaN` | Not available |
-| `+INF` | `Inf` | Positive infinity |
-| `-INF` | `-Inf` | Negative infinity |
-| `EPS` | `-0.0` | "Explicitly zero" in sparse data |
+| GAMS    | Julia  | Notes                            |
+| :------ | :----- | :------------------------------- |
+| `UNDEF` | `NaN`  | Undefined value                  |
+| `NA`    | `NaN`  | Not available                    |
+| `+INF`  | `Inf`  | Positive infinity                |
+| `-INF`  | `-Inf` | Negative infinity                |
+| `EPS`   | `-0.0` | "Explicitly zero" in sparse data |
 
 When writing, `NaN` maps to GAMS `NA`, `Inf`/`-Inf` map to `+INF`/`-INF`,
 and `-0.0` maps back to GAMS `EPS`. This preserves EPS semantics through