1 files changed, 99 insertions, 0 deletions
diff --git a/tools/style-check.sh b/tools/style-check.sh
new file mode 100755
index 0000000..479f7bb
--- /dev/null
+++ b/tools/style-check.sh
@@ -0,0 +1,99 @@
+#!/bin/sh -u
+# tools/style-check.sh -- for conformance or --fix to conform
+# Copyright (C) 2017  Olaf Meeuwissen
+#
+# License: GPL-3.0+
+
+check_final_newline() {
+    test x = "x$(tail -c 1 $1)"
+}
+
+insert_final_newline() {
+    check_final_newline $1 || echo >> $1
+}
+
+check_trailing_whitespace() {
+    test -z "$(sed -n '/[ \t]$/{p;q}' $1)"
+}
+
+trim_trailing_whitespace() {
+    sed -i 's/[ \t]*$//' $1
+}
+
+check_trailing_blank_lines() {
+    test -z "$(sed -n '${/^$/s/^/blank/p}' $1)"
+}
+
+trim_trailing_blank_lines() {
+    sed -i -e :a -e '/^\n*$/{$d;N;};/\n$/ba' $1
+}
+
+check_leading_blank_lines() {
+    test -z "$(sed -n '1{/^$/s/^/blank/p;q}' $1)"
+}
+
+trim_leading_blank_lines() {
+    sed -i '/./,$!d' $1
+}
+
+check_utf_8_charset() {
+    err=$(iconv -f utf-8 -t utf-8 < $1 2>&1 > /dev/null)
+    if test x != "x$err"; then
+        echo "charset not UTF-8: $1" >&2
+        echo "$err" >&2
+        return 1
+    fi
+}
+
+fix=false
+case $1 in
+    --fix) fix=true; shift;;
+esac
+
+status=0
+for file in "$@"; do
+    test -d $file && continue       # skip directories, just in case
+    file=$(echo $file | sed 's,^\.\/,,')
+    case $file in
+        COPYING) ;;                 # hands off of the GPL
+        *.gif) ;;                   # don't touch image files
+        *.jpg) ;;
+        *.png) ;;
+        *.pnm) ;;
+        *.patch) ;;                 # patch output may have trailing lines or whitespace
+        Makefile.in) ;;             # skip automake outputs
+        */Makefile.in) ;;
+        aclocal.m4) ;;              # skip autoconf outputs
+        include/sane/config.h.in) ;;
+        m4/libtool.m4) ;;           # courtesy of libtool
+        m4/lt~obsolete.m4) ;;
+        ABOUT-NLS) ;;               # courtesy of gettext
+        doc/doxygen-*.conf.in) ;;   # don't fix doxygen -g comments
+
+        *)
+            if `$fix`; then
+                trim_trailing_whitespace $file
+                insert_final_newline $file
+                trim_trailing_blank_lines $file
+            else
+                if ! check_trailing_whitespace $file; then
+                    status=1
+                    echo "trailing whitespace: $file" >&2
+                fi
+                if ! check_final_newline $file; then
+                    status=1
+                    echo "final newline missing: $file" >&2
+                fi
+                if ! check_trailing_blank_lines $file; then
+                    status=1
+                    echo "trailing blank lines: $file" >&2
+                fi
+                if ! check_utf_8_charset $file; then
+                    status=1
+                fi
+            fi
+            ;;
+    esac
+done
+
+exit $status