add linter

Taskfile.yml

@@ -3,13 +3,26 @@ version: '3'
 silent: true
 
 tasks:
+  install:
+    desc: install tools required for development or build
+    cmds: [ task: install-golangci-lint ]
+
+  install-golangci-lint:
+    desc: install golangci-lint
+    cmds: [ third_party/golangci-lint/download.sh ]
+
   world:
     desc: run - literally - evertyhing ;)
     cmds:
+      - task: lint
       - task: test
 
   test:
     cmds: [ go test ./... ]
 
+  lint:
+    desc: lint app
+    cmds: [ third_party/golangci-lint/golangci-lint run ]
+
   default:
     cmds: [ task: world ]

third_party/golangci-lint/.gitignore

@@ -0,0 +1 @@
+golangci-lint

third_party/golangci-lint/download.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -eu -o pipefail
+
+SCRIPT_PATH="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+BINARY_PATH="$SCRIPT_PATH/golangci-lint"
+
+DOWNLOAD_URL=''
+
+if uname -a | grep 'Darwin' &> /dev/null; then
+  DOWNLOAD_URL='https://github.com/golangci/golangci-lint/releases/download/v1.40.1/golangci-lint-1.40.1-darwin-amd64.tar.gz'
+else
+  DOWNLOAD_URL='https://github.com/golangci/golangci-lint/releases/download/v1.40.1/golangci-lint-1.40.1-linux-amd64.tar.gz'
+fi
+
+cd "$SCRIPT_PATH"
+curl -fsSL "$DOWNLOAD_URL" | tar -xz
+
+BINARY="$(find golangci-lint-*/golangci-lint)"
+mv "$BINARY" "$BINARY_PATH"
+rm -rf "$(find golangci-lint-*/ -type d)"