coding-nim

Original：🇺🇸 English
Translated

Nim 2.x: macros, templates, compile-time, memory ARC/ORC, FFI, Nimble, systems programming

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Sourcealphaonedev/openclaw-graph
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npx skill4agent add alphaonedev/openclaw-graph coding-nim

Tags

Translated version includes tags in frontmatter
nim-programmingsystems-programmingcompile-time-metaprogrammingmemory-managementffi-integration

SKILL.md Content

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coding-nim

Purpose

This skill equips the AI to handle Nim 2.x programming tasks, focusing on advanced features like macros, templates, compile-time execution, memory management (ARC/ORC), FFI for interoperability, Nimble for package handling, and systems programming. Use it to generate, debug, and optimize Nim code efficiently.

When to Use

Apply this skill for systems-level programming needing low-level control, such as embedded systems, performance-critical apps, or when integrating with C/C++ via FFI. Use it for projects requiring compile-time metaprogramming (e.g., via macros) or automatic memory management with ARC/ORC to avoid manual garbage collection.

Key Capabilities

  • Macros for code generation: Define reusable code transformations at compile-time.
  • Templates for type-safe string-based metaprogramming.
  • Compile-time execution: Run code during compilation using 
    static
    blocks.
  • Memory management: Switch between ARC (automatic reference counting) and ORC (optional reference counting) via compiler flags.
  • FFI: Call external libraries (e.g., C functions) without wrappers.
  • Nimble: Manage dependencies and build projects like a package manager.
  • Systems programming: Direct hardware access, concurrency, and cross-platform compilation.

Usage Patterns

To accomplish tasks, structure Nim code with modules and use the compiler for builds. For macros, define them in a separate proc and invoke at compile-time. When writing FFI code, use the 
importc
pragma for C functions. For memory management, specify 
--gc:arc
or 
--gc:orc
flags during compilation. Always test code with 
nim check
before full builds to catch errors early. Integrate templates for generic functions to reduce boilerplate.

Common Commands/API

Use the Nim compiler (
nim
) for core operations. Compile a file: 
nim c --verbosity:0 -r main.nim
(flags: 
-r
for run, 
--verbosity:0
for minimal output). For Nimble, install packages: 
nimble install somepkg
. Define a macro:
nim
macro doubleIt(x: expr): stmt =  
  result = quote do: `x` * 2
Call it as 
echo doubleIt(5)
. For FFI, import C: 
proc printf(format: cstring; args: varargs[pointer]) {.importc: "printf", header: "<stdio.h>".}
. Config format: Use 
nim.cfg
for settings, e.g., 
gcc.exe = "gcc"
to specify compiler. Environment variables: Set 
$NIMBLE_DIR
for package cache.

Integration Notes

Integrate Nim with other languages via FFI; for C++, use 
importcpp
. To embed in a project, compile Nim code to a shared library: 
nim c --app:lib -d:release mylib.nim
. For CI/CD, use GitHub Actions with: 
run: nim c --opt:speed file.nim
. If auth is needed (e.g., for Nimble registry), set env vars like 
$NIMBLE_TOKEN
for private repos. Link against external libs: Add 
--passL:-lssl
for OpenSSL. Ensure path configurations match, e.g., add 
path = "/path/to/headers"
in 
nim.cfg
.

Error Handling

In Nim, use try-except blocks for runtime errors:
nim
try:  
  raise newException(ValueError, "Invalid input")  
except ValueError:  
  echo "Handled error: ", getCurrentExceptionMsg()
For compile-time errors, enable detailed output with 
nim c --verbosity:2 file.nim
. Check for memory issues by switching to ORC: 
nim c --gc:orc file.nim
. Parse compiler output for specifics; common flags include 
--warnings:on
to catch undeclared vars. Log errors with 
echo
or a logging library like 
chronicles
.

Concrete Usage Examples

  1. Define and use a macro for code generation: To create a loop macro, write:
nim
macro forEach(items: seq, body: stmt): stmt =  
  result = quote do: for item in `items`: `body`
Use it as: 
forEach(@[1, 2, 3], echo item)
. This generates efficient loops at compile-time.
  1. Use FFI to call a C function: Import and call a C printf:
nim
proc cPrintf(format: cstring) {.importc: "printf", header: "<stdio.h>".}  
cPrintf("%s\n", "Hello from Nim")
Compile with 
nim c --passC:-I/usr/include file.nim
to link C headers, enabling seamless integration.

Graph Relationships

  • Related to cluster: coding
  • Connected via tags: nim (direct link to language-specific skills), systems (links to low-level programming tools), coding (broad connections to other coding skills like coding-python or coding-c)