From b96e714b4daf599b88166999d5009317b6e02576 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 25 Mar 2021 09:15:08 +0100
Subject: bin/nit-picker: make option parsing less cumbersome

---
 bin/nit-picker | 63 ++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 41 insertions(+), 22 deletions(-)

(limited to 'bin')

diff --git a/bin/nit-picker b/bin/nit-picker
index bf3bd13..d313586 100755
--- a/bin/nit-picker
+++ b/bin/nit-picker
@@ -17,35 +17,54 @@
 # - check for differences of dependencies between mysql and packages
 # - check for installability of packages
 
-if [ $# -ge 1 ] && [ "x$1" = 'x-n' ]; then
-  >&2 echo 'not joining irc'
-  irc=false
-  repair_dependencies=false
-  shift
-elif [ $# -ge 1 ] && [ "x$1" = 'x-r' ]; then
-  >&2 echo 'repair all wrong dependencies (remove superfluid, add missing)'
-  irc=false
-  repair_dependencies=true
+# shellcheck disable=SC2016
+print_usage() {
+  >&2 echo 'usage: nit-picker [-n|-r] [$single_test]'
+  >&2 echo '  -n: Do not join irc.'
+  >&2 echo '  -r: Remove superfluid dependencies in the database.'
+  >&2 echo '      To avoid catastrophic breakage, this option requires'
+  >&2 echo '      $single_test being set.'
+  >&2 echo '  $single_test: Only execute the given test.'
+}
+
+irc=true
+repair_dependencies=false
+
+while [ $# -ge 1 ]; do
+  case "$1" in
+    '-n')
+      >&2 echo 'not joining irc'
+      irc=false
+    ;;
+    '-r')
+      >&2 echo 'repair all wrong dependencies (remove superfluid, add missing)'
+      repair_dependencies=true
+    ;;
+    '-*')
+      >&2 printf 'unknown option "%s"\n' "$1"
+      print_usage
+      exit 1
+    ;;
+    '*')
+      break
+    ;;
+  esac
   shift
-else
-  irc=true
-  repair_dependencies=false
-  # shellcheck disable=SC2016
-  if [ $# -ne 0 ]; then
-    >&2 echo 'usage: nit-picker [-n|-r] [$single_test]'
-    >&2 echo '  -n: do not join irc'
-    >&2 echo '  -r: remove superfluid dependencies in the database'
-    >&2 echo '  $single_test: only execute the given test'
-    exit 1
-  fi
-fi
+done
 
-if [ $# -eq 0 ] && ! ${repair_dependencies}; then
+if [ $# -eq 0 ]; then
   single_run=false
 else
   single_run=true
 fi
 
+if ${repair_dependencies} \
+&& ! ${single_run}; then
+  >&2 echo 'Option "-r" needs a test.'
+  print_usage
+  exit 1
+fi
+
 clean_up() {
   rm -rf --one-file-system "${tmp_dir}"
 }
-- 
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