Add check for expected line endings

Check that the EOL used in the file corresponds to the expected one for
its extension, in addition to checking that EOLs are consistent.

Closes https://github.com/wxWidgets/wxWidgets/pull/2228

misc/scripts/check_mixed_eol.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-cd `dirname "$0"`/../..
+cd $(dirname "$0")/../..
 
 find . \(                         \
     -path './.git'      -prune -o \
@@ -13,23 +13,70 @@ find . \(                         \
     -o -type f -print0 |
 (
 while IFS= read -r -d '' file; do
+
+    # skip binary files
     case "$file" in
-    *.ani | *.bmp | *.chm | *.dia | *.gif | *.gz | *.hlp | *.icns | *.ico | *.jpg | *.mo | *.mpg | *.pcx | *.pdf | *.png | *.pnm | *.tga | *.tif | *.ttf | *.wav | *.zip )
+    *.ani | *.bmp | *.chm | *.cur | *.dia | *.gif | *.gz | *.hlp | *.icns | *.ico | *.jpg | *.mo | *.mpg | *.pcx | *.pdf | *.png | *.pnm | *.pyc | *.tga | *.tif | *.ttf | *.wav | *.zip )
         continue
         ;;
     esac
 
+    # get used EOL
     read dos unix mac <<< $(dos2unix --info=dum "$file" | awk '{print $1, $2, $3}')
-    if [[ "$dos" -eq "0" ]] && [[ "$unix" -eq "0" ]]; then
+    if [[ "$dos" -eq 0 ]] && [[ "$unix" -eq 0 ]]; then
         :
-    elif [[ "$dos" -eq "0" ]] && [[ "$mac" -eq "0" ]]; then
+    elif [[ "$dos" -eq 0 ]] && [[ "$mac" -eq 0 ]]; then
         :
-    elif [[ "$unix" -eq "0" ]] && [[ "$mac" -eq "0" ]]; then
+    elif [[ "$unix" -eq 0 ]] && [[ "$mac" -eq 0 ]]; then
         :
     else
-        echo "$file has mixed EOL"
+        echo "ERROR - mixed EOL: $file"
+        rc=$((rc+1))
+        continue
+    fi
+
+    # empty file
+    if [[ "$dos" -eq 0 ]] && [[ "$unix" -eq 0 ]] && [[ "$mac" -eq 0 ]]; then
+        continue;
+    fi
+
+    # determine expected EOL
+    warn_expected_eol_unknown=0
+    case "$file" in
+    *.applescript | *.apspec | *.bkgen | *.bkl | *.c | *.C | *.cmake | *.cpp | *.css | *.cxx | *.guess | *.h | *.htm | *.html | *.iface | *.in | *.js | *.json | *.log | *.lua | *.m4 | *.mm | *.manifest | *.md | *.mk | *.mms | *.opt | *.patch | *.pbxproj | *.pl | *.plist | *.po | *.py | *.sh | *.sub | *.svg | *.tex | *.txt | *.TXT | *.unx | *.vms | *.xcconfig | *.xcscheme | *.xcworkspacedata | *.xbm | *.xml | *.xpm | *.xrc | *.yml )
+        expected_eoltype=unix
+        ;;
+    *.bat | *.bcc | *.gcc | *.iss | *.props | *.rc | *.sln | *.vc | *.vcproj | *.vcxproj | *.vcxproj.filters )
+        expected_eoltype=dos
+        ;;
+    * )
+        # warn_expected_eol_unknown=1
+        expected_eoltype=
+        ;;
+    esac
+
+    # check for filename without extension
+    if [[ "$expected_eoltype" = "" ]]; then
+        fullfile=$(basename -- "$file")
+        if [[ "${fullfile:1}" != *"."* ]]; then
+            warn_expected_eol_unknown=0
+            expected_eoltype=unix
+        fi
+    fi
+
+    if [[ "$warn_expected_eol_unknown" -eq 1 ]]; then
+        echo "WARNING - no expected EOL specified: $file"
+    fi
+
+    # check if expected EOL matches used EOL
+    if [[ "$expected_eoltype" = "unix" ]] && [[ "$unix" -eq 0 ]]; then
+        echo "ERROR - wrong EOL, expected unix: $file"
+        rc=$((rc+1))
+    elif [[ "$expected_eoltype" = "dos" ]] && [[ "$dos" -eq 0 ]]; then
+        echo "ERROR - wrong EOL, expected dos: $file"
         rc=$((rc+1))
     fi
+
 done
 exit $rc
 )