golinters

Custom Go linters, usable via go vet -vettool or as golangci-lint module plugins.

Linters

Name	Description	Load Mode
println	Reports println builtin usage	syntax
printf	Reports fmt.(Fp|P)rintf* usage (Fprint only flags os.Stdout)	syntax
uselessf	Reports *f calls with no format args (e.g. Errorf("msg") → errors.New)	syntax
deferfor	Reports defer directly inside a for loop	syntax
errresp	Reports ErrorResponse() not immediately followed by return	syntax
mustcheck	Reports .MustVerb() zero-arg calls outside init and package-level declarations	syntax
fatal	Reports Logger.Fatal* calls	types

Usage with go vet

Each linter has a standalone binary under cmd/:

go build -o println-checker ./cmd/println
go vet -vettool=./println-checker ./...

Or use the combined binary for all linters at once:

go build -o combined-checker ./cmd/combined
go vet -vettool=./combined-checker ./...

Usage with golangci-lint (module plugin)

Requires golangci-lint v2. See testproject/ for a working example.

1. Add .custom-gcl.yml

This tells golangci-lint to build a custom binary with the plugin:

version: v2.10.1
plugins:
  - module: 'github.com/edaniels/golinters'
    version: v0.2.0  # or use path: ../golinters for local dev

2. Add linters to .golangci.yml

Enable whichever linters you want:

version: "2"

linters:
  enable:
    - println
    - printf
    - uselessf
    - deferfor
    - errresp
    - mustcheck
    - fatal
  settings:
    custom:
      println:
        type: module
      printf:
        type: module
      uselessf:
        type: module
      deferfor:
        type: module
      errresp:
        type: module
      mustcheck:
        type: module
      fatal:
        type: module

3. Build and run

golangci-lint custom          # builds ./custom-gcl
./custom-gcl run ./...        # run like normal golangci-lint