Update golangci linter config

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

.golangci.yml

@@ -11,21 +11,43 @@ output:
   format: tab
 
 linters-settings:
+  funlen:
+    lines: 100
+    statements: 60
+
   gocyclo:
     # minimal code complexity to report, 30 by default (but we recommend 10-20)
     min-complexity: 15
 
 linters:
-  enable-all: true
-  disable:
-    - dupl              # Generally a good thing, just too picky
-    - errcheck          # Covered by GAS in a better way so don't bother me
-    - gochecknoglobals  # I object this one: Globals are not always a bad thing
-    - gochecknoinits    # I also object this one: Sometimes init functions make sense
-    - interfacer        # Too eager: I don't always pass interfaces but sometimes specific types
-    - lll               # GTFO my lawn.
-    - unparam           # This one complains about parameters expected for interface implementations
-    - maligned          # I sort structs my way.
-    - whitespace        # When I use newlines for better overview STFU
+  disable-all: true
+  enable:
+    - bodyclose   # checks whether HTTP response body is closed successfully [fast: true, auto-fix: false]
+    - deadcode    # Finds unused code [fast: true, auto-fix: false]
+    - depguard    # Go linter that checks if package imports are in a list of acceptable packages [fast: true, auto-fix: false]
+    - dogsled     # Checks assignments with too many blank identifiers (e.g. x, _, _, _, := f()) [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]
+    - goimports   # Goimports does everything that gofmt does. Additionally it checks unused imports [fast: true, auto-fix: true]
+    - golint      # Golint differs from gofmt. Gofmt reformats Go source code, whereas golint prints out style mistakes [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]
+    - scopelint   # Scopelint checks for unpinned variables in go programs [fast: true, auto-fix: false]
+    - staticcheck # Staticcheck is a go vet on steroids, applying a ton of static analysis checks [fast: true, auto-fix: false]
+    - structcheck # Finds unused struct fields [fast: true, auto-fix: false]
+    - stylecheck  # Stylecheck is a replacement for golint [fast: true, 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]
+    - varcheck    # Finds unused global variables and constants [fast: true, auto-fix: false]
 
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