[CI] Replace old CI with Github Actions

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.github/workflows/test-and-build.yml

@@ -0,0 +1,67 @@
+---
+
+name: test-and-build
+on:
+  push:
+    branches: ['*']
+    tags: ['v*']
+
+  schedule:
+    # Periodically test against current Go version
+    - cron: '23 4 * * 0'
+
+permissions:
+  contents: write
+
+jobs:
+  test-and-build:
+    defaults:
+      run:
+        shell: bash
+
+    container:
+      image: luzifer/archlinux
+      env:
+        CGO_ENABLED: 1
+        GOPATH: /go
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Enable custom AUR package repo
+        run: echo -e "[luzifer]\nSigLevel = Never\nServer = https://archrepo.hub.luzifer.io/\$arch" >>/etc/pacman.conf
+
+      - name: Install required packages
+        run: |
+          pacman -Syy --noconfirm \
+            base-devel \
+            git \
+            go \
+            golangci-lint-bin \
+            trivy
+
+      - uses: actions/checkout@v3
+
+      - name: Marking workdir safe
+        run: git config --global --add safe.directory /__w/rconfig/rconfig
+
+      - name: Run coverage-tests
+        run: |
+          go test -v -race -cover ./...
+
+      - name: Check code for linter errors
+        run: |
+          golangci-lint run ./...
+
+      - name: Run Trivy check
+        run: |
+          trivy fs . \
+            --dependency-tree \
+            --exit-code 1 \
+            --format table \
+            --ignore-unfixed \
+            --quiet \
+            --scanners license,misconfig,secret,vuln \
+            --severity HIGH,CRITICAL
+
+...

.golangci.yml

@@ -0,0 +1,174 @@
+# Derived from https://github.com/golangci/golangci-lint/blob/master/.golangci.example.yml
+
+---
+
+run:
+  # timeout for analysis, e.g. 30s, 5m, default is 1m
+  timeout: 5m
+  # Force readonly modules usage for checking
+  modules-download-mode: readonly
+
+output:
+  format: tab
+
+issues:
+  # This disables the included exclude-list in golangci-lint as that
+  # list for example fully hides G304 gosec rule, errcheck, exported
+  # rule of revive and other errors one really wants to see.
+  # Smme detail: https://github.com/golangci/golangci-lint/issues/456
+  exclude-use-default: false
+  # Don't limit the number of shown issues: Report ALL of them
+  max-issues-per-linter: 0
+  max-same-issues: 0
+
+linters:
+  disable-all: true
+  enable:
+    - asciicheck    # Simple linter to check that your code does not contain non-ASCII identifiers [fast: true, auto-fix: false]
+    - bidichk       # Checks for dangerous unicode character sequences [fast: true, auto-fix: false]
+    - bodyclose     # checks whether HTTP response body is closed successfully [fast: true, auto-fix: false]
+    - containedctx  # containedctx is a linter that detects struct contained context.Context field [fast: true, auto-fix: false]
+    - contextcheck  # check the function whether use a non-inherited context [fast: false, auto-fix: false]
+    - dogsled       # Checks assignments with too many blank identifiers (e.g. x, _, _, _, := f()) [fast: true, auto-fix: false]
+    - durationcheck # check for two durations multiplied together [fast: false, auto-fix: false]
+    - errcheck      # Errcheck is a program for checking for unchecked errors in go programs. These unchecked errors can be critical bugs in some cases [fast: false, auto-fix: false]
+    - errchkjson    # Checks types passed to the json encoding functions. Reports unsupported types and optionally reports occations, where the check for the returned error can be omitted. [fast: false, auto-fix: false]
+    - exportloopref # checks for pointers to enclosing loop variables [fast: true, auto-fix: false]
+    - forbidigo     # Forbids identifiers [fast: true, auto-fix: false]
+    - funlen        # Tool for detection of long functions [fast: true, auto-fix: false]
+    - gocognit      # Computes and checks the cognitive complexity of functions [fast: true, auto-fix: false]
+    - goconst       # Finds repeated strings that could be replaced by a constant [fast: true, auto-fix: false]
+    - gocritic      # The most opinionated Go source code linter [fast: true, auto-fix: false]
+    - gocyclo       # Computes and checks the cyclomatic complexity of functions [fast: true, auto-fix: false]
+    - godox         # Tool for detection of FIXME, TODO and other comment keywords [fast: true, auto-fix: false]
+    - gofmt         # Gofmt checks whether code was gofmt-ed. By default this tool runs with -s option to check for code simplification [fast: true, auto-fix: true]
+    - gofumpt       # Gofumpt checks whether code was gofumpt-ed. [fast: true, auto-fix: true]
+    - goimports     # Goimports does everything that gofmt does. Additionally it checks unused imports [fast: true, auto-fix: true]
+    - gomnd         # An analyzer to detect magic numbers. [fast: true, auto-fix: false]
+    - gosec         # Inspects source code for security problems [fast: true, auto-fix: false]
+    - gosimple      # Linter for Go source code that specializes in simplifying a code [fast: true, auto-fix: false]
+    - govet         # Vet examines Go source code and reports suspicious constructs, such as Printf calls whose arguments do not align with the format string [fast: true, auto-fix: false]
+    - ineffassign   # Detects when assignments to existing variables are not used [fast: true, auto-fix: false]
+    - misspell      # Finds commonly misspelled English words in comments [fast: true, auto-fix: true]
+    - nakedret      # Finds naked returns in functions greater than a specified function length [fast: true, auto-fix: false]
+    - nilerr        # Finds the code that returns nil even if it checks that the error is not nil. [fast: false, auto-fix: false]
+    - nilnil        # Checks that there is no simultaneous return of `nil` error and an invalid value. [fast: false, auto-fix: false]
+    - noctx         # noctx finds sending http request without context.Context [fast: true, auto-fix: false]
+    - nolintlint    # Reports ill-formed or insufficient nolint directives [fast: true, auto-fix: false]
+    - revive        # Fast, configurable, extensible, flexible, and beautiful linter for Go. Drop-in replacement of golint. [fast: false, auto-fix: false]
+    - staticcheck   # Staticcheck is a go vet on steroids, applying a ton of static analysis checks [fast: true, auto-fix: false]
+    - stylecheck    # Stylecheck is a replacement for golint [fast: true, auto-fix: false]
+    - tenv          # tenv is analyzer that detects using os.Setenv instead of t.Setenv since Go1.17 [fast: false, auto-fix: false]
+    - typecheck     # Like the front-end of a Go compiler, parses and type-checks Go code [fast: true, auto-fix: false]
+    - unconvert     # Remove unnecessary type conversions [fast: true, auto-fix: false]
+    - unused        # Checks Go code for unused constants, variables, functions and types [fast: false, auto-fix: false]
+    - wastedassign  # wastedassign finds wasted assignment statements. [fast: false, auto-fix: false]
+    - wrapcheck     # Checks that errors returned from external packages are wrapped [fast: false, auto-fix: false]
+
+linters-settings:
+  funlen:
+    lines: 100
+    statements: 60
+
+  gocyclo:
+    # minimal code complexity to report, 30 by default (but we recommend 10-20)
+    min-complexity: 15
+
+  gomnd:
+    settings:
+      mnd:
+        ignored-functions: 'strconv.(?:Format|Parse)\B+'
+
+  revive:
+    rules:
+      #- name: add-constant           # Suggests using constant for magic numbers and string literals
+                                      # Opinion: Makes sense for strings, not for numbers but checks numbers
+      #- name: argument-limit         # Specifies the maximum number of arguments a function can receive | Opinion: Don't need this
+      - name: atomic                  # Check for common mistaken usages of the `sync/atomic` package
+      - name: banned-characters       # Checks banned characters in identifiers
+        arguments:
+          - ';' # Greek question mark
+      - name: bare-return             # Warns on bare returns
+      - name: blank-imports           # Disallows blank imports
+      - name: bool-literal-in-expr    # Suggests removing Boolean literals from logic expressions
+      - name: call-to-gc              # Warns on explicit call to the garbage collector
+      #- name: cognitive-complexity   # Sets restriction for maximum Cognitive complexity.
+                                      # There is a dedicated linter for this
+      - name: confusing-naming        # Warns on methods with names that differ only by capitalization
+      - name: confusing-results       # Suggests to name potentially confusing function results
+      - name: constant-logical-expr   # Warns on constant logical expressions
+      - name: context-as-argument     # `context.Context` should be the first argument of a function.
+      - name: context-keys-type       # Disallows the usage of basic types in `context.WithValue`.
+      #- name: cyclomatic             # Sets restriction for maximum Cyclomatic complexity.
+                                      # There is a dedicated linter for this
+      #- name: datarace               # Spots potential dataraces
+                                      # Is not (yet) available?
+      - name: deep-exit               # Looks for program exits in funcs other than `main()` or `init()`
+      - name: defer                   # Warns on some [defer gotchas](https://blog.learngoprogramming.com/5-gotchas-of-defer-in-go-golang-part-iii-36a1ab3d6ef1)
+      - name: dot-imports             # Forbids `.` imports.
+      - name: duplicated-imports      # Looks for packages that are imported two or more times
+      - name: early-return            # Spots if-then-else statements that can be refactored to simplify code reading
+      - name: empty-block             # Warns on empty code blocks
+      - name: empty-lines             # Warns when there are heading or trailing newlines in a block
+      - name: errorf                  # Should replace `errors.New(fmt.Sprintf())` with `fmt.Errorf()`
+      - name: error-naming            # Naming of error variables.
+      - name: error-return            # The error return parameter should be last.
+      - name: error-strings           # Conventions around error strings.
+      - name: exported                # Naming and commenting conventions on exported symbols.
+        arguments: ['sayRepetitiveInsteadOfStutters']
+      #- name: file-header            # Header which each file should have.
+                                      # Useless without config, have no config for it
+      - name: flag-parameter          # Warns on boolean parameters that create a control coupling
+      #- name: function-length        # Warns on functions exceeding the statements or lines max
+                                      # There is a dedicated linter for this
+      #- name: function-result-limit  # Specifies the maximum number of results a function can return
+                                      # Opinion: Don't need this
+      - name: get-return              # Warns on getters that do not yield any result
+      - name: identical-branches      # Spots if-then-else statements with identical `then` and `else` branches
+      - name: if-return               # Redundant if when returning an error.
+      #- name: imports-blacklist      # Disallows importing the specified packages
+                                      # Useless without config, have no config for it
+      - name: import-shadowing        # Spots identifiers that shadow an import
+      - name: increment-decrement     # Use `i++` and `i--` instead of `i += 1` and `i -= 1`.
+      - name: indent-error-flow       # Prevents redundant else statements.
+      #- name: line-length-limit      # Specifies the maximum number of characters in a lined
+                                      # There is a dedicated linter for this
+      #- name: max-public-structs     # The maximum number of public structs in a file.
+                                      # Opinion: Don't need this
+      - name: modifies-parameter      # Warns on assignments to function parameters
+      - name: modifies-value-receiver # Warns on assignments to value-passed method receivers
+      #- name: nested-structs         # Warns on structs within structs
+                                      # Opinion: Don't need this
+      - name: optimize-operands-order # Checks inefficient conditional expressions
+      #- name: package-comments       # Package commenting conventions.
+                                      # Opinion: Don't need this
+      - name: range                   # Prevents redundant variables when iterating over a collection.
+      - name: range-val-address       # Warns if address of range value is used dangerously
+      - name: range-val-in-closure    # Warns if range value is used in a closure dispatched as goroutine
+      - name: receiver-naming         # Conventions around the naming of receivers.
+      - name: redefines-builtin-id    # Warns on redefinitions of builtin identifiers
+      #- name: string-format          # Warns on specific string literals that fail one or more user-configured regular expressions
+                                      # Useless without config, have no config for it
+      - name: string-of-int           # Warns on suspicious casts from int to string
+      - name: struct-tag              # Checks common struct tags like `json`,`xml`,`yaml`
+      - name: superfluous-else        # Prevents redundant else statements (extends indent-error-flow)
+      - name: time-equal              # Suggests to use `time.Time.Equal` instead of `==` and `!=` for equality check time.
+      - name: time-naming             # Conventions around the naming of time variables.
+      - name: unconditional-recursion # Warns on function calls that will lead to (direct) infinite recursion
+      - name: unexported-naming       # Warns on wrongly named un-exported symbols
+      - name: unexported-return       # Warns when a public return is from unexported type.
+      - name: unhandled-error         # Warns on unhandled errors returned by funcion calls
+        arguments:
+          - "fmt.(Fp|P)rint(f|ln|)"
+      - name: unnecessary-stmt        # Suggests removing or simplifying unnecessary statements
+      - name: unreachable-code        # Warns on unreachable code
+      - name: unused-parameter        # Suggests to rename or remove unused function parameters
+      - name: unused-receiver         # Suggests to rename or remove unused method receivers
+      #- name: use-any                # Proposes to replace `interface{}` with its alias `any`
+                                      # Is not (yet) available?
+      - name: useless-break           # Warns on useless `break` statements in case clauses
+      - name: var-declaration         # Reduces redundancies around variable declaration.
+      - name: var-naming              # Naming rules.
+      - name: waitgroup-by-value      # Warns on functions taking sync.WaitGroup as a by-value parameter
+
+...

.repo-runner.yaml

@@ -1,10 +0,0 @@
----
-
-image: "reporunner/golang-alpine"
-checkout_dir: /go/src/github.com/Luzifer/rconfig
-
-commands:
-  - apk --no-cache add build-base
-  - go test -v -race -cover ./...
-
-...

autoenv_test.go

@@ -2,6 +2,8 @@ package rconfig
 
 import (
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestDeriveEnvVarName(t *testing.T) {
@@ -17,13 +19,11 @@ func TestDeriveEnvVarName(t *testing.T) {
 		"CamelCase":            "CAMEL_CASE",
 		"_foobar":              "FOOBAR",
 		"ILoveGoAndJSONSoMuch": "I_LOVE_GO_AND_JSON_SO_MUCH",
-		"mrT":         "MR_T",
-		"my_case1":    "MY_CASE1",
-		"MyFieldName": "MY_FIELD_NAME",
-		"SmallCASE":   "SMALL_CASE",
+		"mrT":                  "MR_T",
+		"my_case1":             "MY_CASE1",
+		"MyFieldName":          "MY_FIELD_NAME",
+		"SmallCASE":            "SMALL_CASE",
 	} {
-		if d := deriveEnvVarName(test); d != expect {
-			t.Errorf("Derived variable %q did not match expectation %q", d, expect)
-		}
+		assert.Equal(t, expect, deriveEnvVarName(test))
 	}
 }

config.go

@@ -49,21 +49,20 @@ func init() {
 // For your configuration struct you can use the following struct-tags to control
 // the behavior of rconfig:
 //
-//     default: Set a default value
-//     vardefault: Read the default value from the variable defaults
-//     env: Read the value from this environment variable
-//     flag: Flag to read in format "long,short" (for example "listen,l")
-//     description: A help text for Usage output to guide your users
+//	default: Set a default value
+//	vardefault: Read the default value from the variable defaults
+//	env: Read the value from this environment variable
+//	flag: Flag to read in format "long,short" (for example "listen,l")
+//	description: A help text for Usage output to guide your users
 //
 // The format you need to specify those values you can see in the example to this
 // function.
-//
 func Parse(config interface{}) error {
 	return parse(config, nil)
 }
 
 // ParseAndValidate works exactly like Parse but implements an additional run of
-// the go-validator package on the configuration struct. Therefore additonal struct
+// the go-validator package on the configuration struct. Therefore additional struct
 // tags are supported like described in the readme file of the go-validator package:
 //
 // https://github.com/go-validator/validator/tree/v2#usage
@@ -103,14 +102,20 @@ func SetVariableDefaults(defaults map[string]string) {
 	variableDefaults = defaults
 }
 
-func parseAndValidate(in interface{}, args []string) error {
-	if err := parse(in, args); err != nil {
+//revive:disable-next-line:confusing-naming // The public function is only a wrapper with less args
+func parseAndValidate(in interface{}, args []string) (err error) {
+	if err = parse(in, args); err != nil {
 		return err
 	}
 
-	return validator.Validate(in)
+	if err = validator.Validate(in); err != nil {
+		return fmt.Errorf("validating values: %w", err)
+	}
+
+	return nil
 }
 
+//revive:disable-next-line:confusing-naming // The public function is only a wrapper with less args
 func parse(in interface{}, args []string) error {
 	if args == nil {
 		args = os.Args
@@ -123,27 +128,26 @@ func parse(in interface{}, args []string) error {
 	}
 
 	if err := fs.Parse(args); err != nil {
-		return err
+		return fmt.Errorf("parsing flag-set: %w", err)
 	}
 
-	if afterFuncs != nil {
-		for _, f := range afterFuncs {
-			if err := f(); err != nil {
-				return err
-			}
+	for _, f := range afterFuncs {
+		if err := f(); err != nil {
+			return err
 		}
 	}
 
 	return nil
 }
 
+//nolint:funlen,gocognit,gocyclo // Hard to split
 func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 	if reflect.TypeOf(in).Kind() != reflect.Ptr {
-		return nil, errors.New("Calling parser with non-pointer")
+		return nil, errors.New("calling parser with non-pointer")
 	}
 
 	if reflect.ValueOf(in).Elem().Kind() != reflect.Struct {
-		return nil, errors.New("Calling parser with pointer to non-struct")
+		return nil, errors.New("calling parser with pointer to non-struct")
 	}
 
 	afterFuncs := []afterFunc{}
@@ -166,11 +170,10 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 		case reflect.TypeOf(time.Duration(0)):
 			v, err := time.ParseDuration(value)
 			if err != nil {
-				if value == "" {
-					v = time.Duration(0)
-				} else {
-					return nil, err
+				if value != "" {
+					return nil, fmt.Errorf("parsing time.Duration: %w", err)
 				}
+				v = time.Duration(0)
 			}
 
 			if typeField.Tag.Get("flag") != "" {
@@ -215,14 +218,13 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 					matched := false
 					for _, tf := range timeParserFormats {
 						if t, err := time.Parse(tf, *sVar); err == nil {
-							matched = true
 							valField.Set(reflect.ValueOf(t))
 							return nil
 						}
 					}
 
 					if !matched {
-						return fmt.Errorf("Value %q did not match expected time formats", *sVar)
+						return fmt.Errorf("value %q did not match expected time formats", *sVar)
 					}
 
 					return nil
@@ -259,11 +261,10 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 		case reflect.Int, reflect.Int8, reflect.Int32, reflect.Int64:
 			vt, err := strconv.ParseInt(value, 10, 64)
 			if err != nil {
-				if value == "" {
-					vt = 0
-				} else {
-					return nil, err
+				if value != "" {
+					return nil, fmt.Errorf("parsing int: %w", err)
 				}
+				vt = 0
 			}
 			if typeField.Tag.Get("flag") != "" {
 				registerFlagInt(typeField.Type.Kind(), fs, valField.Addr().Interface(), parts, vt, typeField.Tag.Get("description"))
@@ -274,11 +275,10 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
 			vt, err := strconv.ParseUint(value, 10, 64)
 			if err != nil {
-				if value == "" {
-					vt = 0
-				} else {
-					return nil, err
+				if value != "" {
+					return nil, fmt.Errorf("parsing uint: %w", err)
 				}
+				vt = 0
 			}
 			if typeField.Tag.Get("flag") != "" {
 				registerFlagUint(typeField.Type.Kind(), fs, valField.Addr().Interface(), parts, vt, typeField.Tag.Get("description"))
@@ -289,11 +289,10 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 		case reflect.Float32, reflect.Float64:
 			vt, err := strconv.ParseFloat(value, 64)
 			if err != nil {
-				if value == "" {
-					vt = 0.0
-				} else {
-					return nil, err
+				if value != "" {
+					return nil, fmt.Errorf("parsing float: %w", err)
 				}
+				vt = 0.0
 			}
 			if typeField.Tag.Get("flag") != "" {
 				registerFlagFloat(typeField.Type.Kind(), fs, valField.Addr().Interface(), parts, vt, typeField.Tag.Get("description"))
@@ -315,7 +314,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 				for _, v := range strings.Split(value, ",") {
 					it, err := strconv.ParseInt(strings.TrimSpace(v), 10, 64)
 					if err != nil {
-						return nil, err
+						return nil, fmt.Errorf("parsing int: %w", err)
 					}
 					def = append(def, int(it))
 				}
@@ -329,7 +328,7 @@ func execTags(in interface{}, fs *pflag.FlagSet) ([]afterFunc, error) {
 				if len(del) == 0 {
 					del = ","
 				}
-				var def = []string{}
+				def := []string{}
 				if value != "" {
 					def = strings.Split(value, del)
 				}
@@ -355,9 +354,9 @@ func registerFlagFloat(t reflect.Kind, fs *pflag.FlagSet, field interface{}, par
 		}
 	case reflect.Float64:
 		if len(parts) == 1 {
-			fs.Float64Var(field.(*float64), parts[0], float64(vt), desc)
+			fs.Float64Var(field.(*float64), parts[0], vt, desc)
 		} else {
-			fs.Float64VarP(field.(*float64), parts[0], parts[1], float64(vt), desc)
+			fs.Float64VarP(field.(*float64), parts[0], parts[1], vt, desc)
 		}
 	}
 }
@@ -384,9 +383,9 @@ func registerFlagInt(t reflect.Kind, fs *pflag.FlagSet, field interface{}, parts
 		}
 	case reflect.Int64:
 		if len(parts) == 1 {
-			fs.Int64Var(field.(*int64), parts[0], int64(vt), desc)
+			fs.Int64Var(field.(*int64), parts[0], vt, desc)
 		} else {
-			fs.Int64VarP(field.(*int64), parts[0], parts[1], int64(vt), desc)
+			fs.Int64VarP(field.(*int64), parts[0], parts[1], vt, desc)
 		}
 	}
 }
@@ -419,9 +418,9 @@ func registerFlagUint(t reflect.Kind, fs *pflag.FlagSet, field interface{}, part
 		}
 	case reflect.Uint64:
 		if len(parts) == 1 {
-			fs.Uint64Var(field.(*uint64), parts[0], uint64(vt), desc)
+			fs.Uint64Var(field.(*uint64), parts[0], vt, desc)
 		} else {
-			fs.Uint64VarP(field.(*uint64), parts[0], parts[1], uint64(vt), desc)
+			fs.Uint64VarP(field.(*uint64), parts[0], parts[1], vt, desc)
 		}
 	}
 }

errors_test.go

@@ -2,12 +2,14 @@ package rconfig
 
 import (
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestErrors(t *testing.T) {
 	for test, parsable := range map[string]interface{}{
 		"use string as default to int": struct {
-			A int `default:"a"`
+			A int `default:"a"` //revive:disable-line:struct-tag // Intentional error for testing
 		}{},
 		"use string as default to float": struct {
 			A float32 `default:"a"`
@@ -24,18 +26,12 @@ func TestErrors(t *testing.T) {
 			A []int `default:"a,b"`
 		}{},
 	} {
-		if err := parse(&parsable, nil); err == nil {
-			t.Errorf("Expected error but got none. Test: %s", test)
-		}
+		assert.Error(t, parse(&parsable, nil), test) //#nosec:G601 // Fine for this test
 	}
 
-	if err := parse(struct {
+	assert.Error(t, parse(struct {
 		A string `default:"a"`
-	}{}, nil); err == nil {
-		t.Errorf("Expected error when feeding non-pointer struct to parse")
-	}
+	}{}, nil), "feeding non-pointer to parse")
 
-	if err := parse("test", nil); err == nil {
-		t.Errorf("Expected error when feeding non-pointer string to parse")
-	}
+	assert.Error(t, parse("test", nil), "feeding non-pointer string to parse")
 }

example_test.go

@@ -1,8 +1,10 @@
-package rconfig
+package rconfig_test
 
 import (
 	"fmt"
 	"os"
+
+	"github.com/Luzifer/rconfig/v2"
 )
 
 func ExampleParse() {
@@ -23,14 +25,16 @@ func ExampleParse() {
 		"--user=Luzifer",
 	}
 
-	Parse(&config)
+	if err := rconfig.Parse(&config); err != nil {
+		panic(err)
+	}
 
 	fmt.Printf("Hello %s, happy birthday for your %dth birthday.",
 		config.Username,
 		config.Details.Age)
 
 	// You can also show an usage message for your user
-	Usage()
+	rconfig.Usage()
 
 	// Output:
 	// Hello Luzifer, happy birthday for your 25th birthday.

general_test.go

@@ -4,6 +4,9 @@ import (
 	"os"
 	"reflect"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestGeneralExecution(t *testing.T) {
@@ -20,14 +23,10 @@ func TestGeneralExecution(t *testing.T) {
 	)
 
 	exec := func(desc string, tests [][2]interface{}) {
-		if err := parse(&cfg, args); err != nil {
-			t.Fatalf("Parsing options caused error: %s", err)
-		}
+		require.NoError(t, parse(&cfg, args))
 
 		for _, test := range tests {
-			if !reflect.DeepEqual(reflect.ValueOf(test[0]).Elem().Interface(), test[1]) {
-				t.Errorf("%q expected value does not match: %#v != %#v", desc, test[0], test[1])
-			}
+			assert.Equal(t, test[1], reflect.ValueOf(test[0]).Elem().Interface(), desc)
 		}
 	}
 
@@ -51,11 +50,11 @@ func TestGeneralExecution(t *testing.T) {
 
 	cfg = test{}
 	args = []string{}
-	os.Setenv("shell", "test546")
+	require.NoError(t, os.Setenv("shell", "test546"))
 	exec("no arguments and set env", [][2]interface{}{
 		{&cfg.Test, "test546"},
 	})
-	os.Unsetenv("shell")
+	require.NoError(t, os.Unsetenv("shell"))
 
 	cfg = test{}
 	args = []string{
@@ -70,9 +69,7 @@ func TestGeneralExecution(t *testing.T) {
 		{&cfg.DefaultFlag, "goo"},
 	})
 
-	if !reflect.DeepEqual(Args(), []string{"positional1", "positional2"}) {
-		t.Errorf("expected positional arguments to match")
-	}
+	assert.Equal(t, []string{"positional1", "positional2"}, Args())
 }
 
 func TestValidationIntegration(t *testing.T) {
@@ -85,7 +82,5 @@ func TestValidationIntegration(t *testing.T) {
 		args         = []string{}
 	)
 
-	if err := parseAndValidate(&cfgValidated, args); err == nil {
-		t.Errorf("Expected error, got none")
-	}
+	assert.Error(t, parseAndValidate(&cfgValidated, args))
 }

go.mod

@@ -1,9 +1,15 @@
 module github.com/Luzifer/rconfig/v2
 
-go 1.17
+go 1.20
 
 require (
 	github.com/spf13/pflag v1.0.5
-	gopkg.in/validator.v2 v2.0.0-20210331031555-b37d688a7fb0
-	gopkg.in/yaml.v2 v2.4.0
+	github.com/stretchr/testify v1.8.4
+	gopkg.in/validator.v2 v2.0.1
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 )

go.sum

@@ -1,8 +1,16 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/validator.v2 v2.0.0-20210331031555-b37d688a7fb0 h1:EFLtLCwd8tGN+r/ePz3cvRtdsfYNhDEdt/vp6qsT+0A=
-gopkg.in/validator.v2 v2.0.0-20210331031555-b37d688a7fb0/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/validator.v2 v2.0.1 h1:xF0KWyGWXm/LM2G1TrEjqOu4pa6coO9AlWSf3msVfDY=
+gopkg.in/validator.v2 v2.0.1/go.mod h1:lIUZBlB3Im4s/eYp39Ry/wkR02yOPhZ9IwIRBjuPuG8=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

precedence_test.go

@@ -3,6 +3,9 @@ package rconfig
 import (
 	"os"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestPrecedence(t *testing.T) {
@@ -11,7 +14,6 @@ func TestPrecedence(t *testing.T) {
 	}
 
 	var (
-		err         error
 		cfg         testcfg
 		args        []string
 		vardefaults map[string]string
@@ -20,20 +22,14 @@ func TestPrecedence(t *testing.T) {
 	exec := func(desc string, fn func() interface{}, exp interface{}) {
 		cfg = testcfg{}
 		SetVariableDefaults(vardefaults)
-		err = parse(&cfg, args)
+		assert.NoError(t, parse(&cfg, args), desc)
 
-		if err != nil {
-			t.Errorf("%q parsing caused error: %s", desc, err)
-		}
-
-		if res := fn(); res != exp {
-			t.Errorf("%q expected value does not match: %#v != %#v", desc, res, exp)
-		}
+		assert.Equal(t, exp, fn())
 	}
 
 	// Provided: Flag, Env, Default, VarDefault
 	args = []string{"-a", "5"}
-	os.Setenv("a", "8")
+	require.NoError(t, os.Setenv("a", "8"))
 	vardefaults = map[string]string{
 		"a": "3",
 	}
@@ -42,7 +38,7 @@ func TestPrecedence(t *testing.T) {
 
 	// Provided: Env, Default, VarDefault
 	args = []string{}
-	os.Setenv("a", "8")
+	require.NoError(t, os.Setenv("a", "8"))
 	vardefaults = map[string]string{
 		"a": "3",
 	}
@@ -51,7 +47,7 @@ func TestPrecedence(t *testing.T) {
 
 	// Provided: Default, VarDefault
 	args = []string{}
-	os.Unsetenv("a")
+	require.NoError(t, os.Unsetenv("a"))
 	vardefaults = map[string]string{
 		"a": "3",
 	}
@@ -60,7 +56,7 @@ func TestPrecedence(t *testing.T) {
 
 	// Provided: Default
 	args = []string{}
-	os.Unsetenv("a")
+	require.NoError(t, os.Unsetenv("a"))
 	vardefaults = map[string]string{}
 
 	exec("Provided: Default", func() interface{} { return cfg.A }, 1)

vardefault_providers.go

@@ -1,14 +1,14 @@
 package rconfig
 
 import (
-	"io/ioutil"
+	"os"
 
-	"gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v3"
 )
 
 // VarDefaultsFromYAMLFile reads contents of a file and calls VarDefaultsFromYAML
 func VarDefaultsFromYAMLFile(filename string) map[string]string {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename) //#nosec:G304 // Loading file from var is intended
 	if err != nil {
 		return make(map[string]string)
 	}

vardefault_test.go

@@ -1,10 +1,12 @@
 package rconfig
 
 import (
-	"io/ioutil"
 	"os"
 	"reflect"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestVardefaultParsing(t *testing.T) {
@@ -18,6 +20,7 @@ func TestVardefaultParsing(t *testing.T) {
 	var (
 		cfg         test
 		args        = []string{}
+		err         error
 		vardefaults = map[string]string{
 			"my_secret_value": "veryverysecretkey",
 			"unkownkey":       "hi there",
@@ -26,14 +29,10 @@ func TestVardefaultParsing(t *testing.T) {
 	)
 
 	exec := func(desc string, tests [][2]interface{}) {
-		if err := parse(&cfg, args); err != nil {
-			t.Fatalf("Parsing options caused error: %s", err)
-		}
+		require.NoError(t, parse(&cfg, args))
 
 		for _, test := range tests {
-			if !reflect.DeepEqual(reflect.ValueOf(test[0]).Elem().Interface(), test[1]) {
-				t.Errorf("%q expected value does not match: %#v != %#v", desc, test[0], test[1])
-			}
+			assert.Equal(t, test[1], reflect.ValueOf(test[0]).Elem().Interface(), desc)
 		}
 	}
 
@@ -53,13 +52,14 @@ func TestVardefaultParsing(t *testing.T) {
 		{&cfg.SomeVar, ""},
 	})
 
-	tmp, _ := ioutil.TempFile("", "")
-	defer func() {
-		tmp.Close()
-		os.Remove(tmp.Name())
-	}()
+	tmp, _ := os.CreateTemp("", "")
+	t.Cleanup(func() {
+		tmp.Close()           //nolint:errcheck,gosec,revive // Just cleanup, will be closed automatically
+		os.Remove(tmp.Name()) //nolint:errcheck,gosec,revive // Just cleanup of tmp-file
+	})
 	yamlData := "---\nmy_secret_value: veryverysecretkey\nunknownkey: hi there\nint_var: 42\n"
-	tmp.WriteString(yamlData)
+	_, err = tmp.WriteString(yamlData)
+	require.NoError(t, err)
 	SetVariableDefaults(VarDefaultsFromYAMLFile(tmp.Name()))
 	exec("defaults from YAML file", [][2]interface{}{
 		{&cfg.IntVar, int64(42)},