NickelEval.jl

Julia FFI bindings for Nickel configuration language
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build.jl (2109B)

      1 # Build script: compile Nickel's C API library from source
      2 # Triggered by NICKELEVAL_BUILD_FFI=true
      3 
      4 const NICKEL_VERSION = "1.16.0"
      5 const NICKEL_REPO = "https://github.com/nickel-lang/nickel.git"
      6 
      7 function library_name()
      8     if Sys.isapple()
      9         return "libnickel_lang.dylib"
     10     elseif Sys.iswindows()
     11         return "nickel_lang.dll"
     12     else
     13         return "libnickel_lang.so"
     14     end
     15 end
     16 
     17 function build_nickel_capi()
     18     cargo = Sys.which("cargo")
     19     if cargo === nothing
     20         @warn "cargo not found in PATH. Install Rust: https://rustup.rs/"
     21         return false
     22     end
     23 
     24     src_dir = joinpath(@__DIR__, "_nickel_src")
     25 
     26     # Clone or update — remove stale shallow clones to avoid fetch issues
     27     if isdir(src_dir)
     28         rm(src_dir; recursive=true, force=true)
     29     end
     30     @info "Cloning Nickel $(NICKEL_VERSION)..."
     31     run(`git clone --depth 1 --branch $(NICKEL_VERSION) $(NICKEL_REPO) $(src_dir)`)
     32 
     33     @info "Building Nickel C API library..."
     34     try
     35         cd(src_dir) do
     36             run(`cargo build --release -p nickel-lang --features capi`)
     37         end
     38 
     39         src_lib = joinpath(src_dir, "target", "release", library_name())
     40         dst_lib = joinpath(@__DIR__, library_name())
     41 
     42         if isfile(src_lib)
     43             cp(src_lib, dst_lib; force=true)
     44             @info "Library built: $(dst_lib)"
     45 
     46             # Also generate header if cbindgen is available
     47             if Sys.which("cbindgen") !== nothing
     48                 cd(joinpath(src_dir, "nickel")) do
     49                     run(`cbindgen --config cbindgen.toml --crate nickel-lang --output $(joinpath(@__DIR__, "nickel_lang.h"))`)
     50                 end
     51                 @info "Header generated: $(joinpath(@__DIR__, "nickel_lang.h"))"
     52             end
     53 
     54             return true
     55         else
     56             @warn "Built library not found at $(src_lib)"
     57             return false
     58         end
     59     catch e
     60         @warn "Build failed: $(e)"
     61         return false
     62     end
     63 end
     64 
     65 if get(ENV, "NICKELEVAL_BUILD_FFI", "false") == "true"
     66     build_nickel_capi()
     67 else
     68     @info "Skipping FFI build (set NICKELEVAL_BUILD_FFI=true to enable)"
     69 end