Revert to old zstdgrep

programs/zstdgrep

@@ -28,6 +28,8 @@ zcat=${ZCAT:-zstdcat}
 endofopts=0
 pattern_found=0
 grep_args=""
+hyphen=0
+silent=0
 
 prog=${0##*/}
 
@@ -41,158 +43,92 @@ esac
 # skip all options and pass them on to grep taking care of options
 # with arguments, and if -e was supplied
 
-escape='
-  s/'\''/'\''\\'\'''\''/g
-  $s/$/'\''/
-'
-
-# We might want to create a c program in the future
-# and replace this file with that if these
-# unsupported options become necessary
-usage="Usage: $0 [OPTION]... [-e] PATTERN [FILE]...
-OPTIONs are the same as grep with the exception of
-the following unsupported options:
-    --dereference-recursive (-R)
-    --directories (-d)
-    --exclude
-    --exclude-from
-    --exclude-dir
-    --include
-    --null (-Z),
-    --null-data (-z)
-    --recursive (-r)
-grep --help below:
-"
-
-operands=
-files_with_matches=0
-files_without_matches=0
-no_filename=0
-with_filename=0
-
 while [ "$#" -gt 0 ] && [ "${endofopts}" -eq 0 ]; do
-    option=$1
-    shift
-    optarg=
-
-    case $option in
-        (-[0123456789EFGHIKLPRTUVZabchilnoqrsuvwxyz]?*)
-            arg2=-\'$(expr "X$option" : 'X-.[0-9]*\(.*\)' | sed "$escape")
-            eval "set -- $arg2 "'${1+"$@"}'
-            option=$(expr "X$option" : 'X\(-.[0-9]*\)');;
-        (--binary-*=* | --[lm]a*=* | --reg*=*) ;;
-        (-[ABCDXdefm] | binary-* | --file | --[lm]a* | --reg*)
-            case ${1?"$option option requires an argument"} in
-                (*\'*) optarg=" '"$(printf '%s\n' "$1" | sed "$escape");;
-                (*) optarg=" '$1'";;
-            esac
-            shift;;
-        (-f?*\'*) optarg=" '"$(expr "X$option" : 'X-f\(.*\)' | sed "$escape"); option=-f;;
-        (-f?*) optarg=" '"$(expr "X$option" : 'X-f\(.*\)')\'; option=-f;;
-        (--file=*\'*) optarg=" '"$(expr "X$option" : 'X--file=\(.*\)' | sed "$escape"); option=--file;;
-        (--file=*) optarg=" '"$(expr "X$option" : 'X--file=\(.*\)')\'; option=--file;;
-        (--) endofopts=1; break;;
-        (-?*) ;;
-        (*)
-            case $option in
-                (*\'*) operands="$operands '"$(printf '%s\n' "$option" | sed "$escape");;
-                (*) operands="$operands '$option'";;
+    case "$1" in
+    # from GNU grep-2.5.1 -- keep in sync!
+        -[ABCDXdefm])
+            if [ "$#" -lt 2 ]; then
+                printf '%s: missing argument for %s flag\n' "${prog}" "$1" >&2
+                exit 1
+            fi
+            case "$1" in
+                -e)
+                    pattern="$2"
+                    pattern_found=1
+                    shift 2
+                    break
+                    ;;
+                -f)
+                    pattern_found=2
+                    ;;
+                *)
+                    ;;
             esac
-            ${POSIXLY_CORRECT+break}
+            grep_args="${grep_args} $1 $2"
+            shift 2
+            ;;
+        --)
+            shift
             endofopts=1
-            continue;;
-        esac
-
-        case $option in
-            (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
-                printf >&2 '%s: %s: option not supported\n' "$0" "$option"
-                exit 2;;
-            (-e* | --reg*) pattern_found=1;;
-            (-f | --file)
-                case $optarg in
-                    (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
-                        option=-e
-                        optarg=" '"$(sed "$escape") || exit 2;;
-                esac
-                pattern_found=1;;
-            (--h | --he | --hel | --help) echo "$usage"; eval "$grep --help" || exit 2; exit;;
-            (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
-            | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
-            | --with-filename)
-                with_filename=1
-                continue;;
-            (-l | --files-with-*) files_with_matches=1;;
-            (-L | --files-witho*) files_without_matches=1;;
-            (-h | --no-f*) no_filename=1;;
-        esac
-
-        case $option in
-            (*\'?*) option=\'$(printf '%s\n' "$option" | sed "$escape");;
-            (*) option="'$option'";;
-        esac
-
-        grep_args="$option$optarg"
-        grep="$grep $grep_args"
-    done
-
-eval "set -- $operands "'${1+"$@"}'
-
-if test $pattern_found -eq 0; then
-    case ${1?"missing pattern; try \`$0 --help' for help"} in
-        (*\'*) grep="$grep -- '"$(printf '%s\n' "$1" | sed "$escape");;
-        (*) grep="$grep -- '$1'";;
+            ;;
+        -)
+            hyphen=1
+            shift
+            ;;
+        -h)
+            silent=1
+            shift
+            ;;
+        -*)
+            grep_args="${grep_args} $1"
+            shift
+            ;;
+        *)
+            # pattern to grep for
+            endofopts=1
+            ;;
     esac
-    shift
-fi
+done
 
-if test $# -eq 0; then
-    set -- -
+# if no -e option was found, take next argument as grep-pattern
+if [ "${pattern_found}" -lt 1 ]; then
+    if [ "$#" -ge 1 ]; then
+        pattern="$1"
+        shift
+    elif [ "${hyphen}" -gt 0 ]; then
+        pattern="-"
+    else
+        printf '%s: missing pattern\n' "${prog}" >&2
+        exit 1
+    fi
 fi
 
-exec 3>&1
-res=0
-
-for i do
-    zcat_status=$(
-        exec 5>&1
-        ($zcat -- "$i" 5>&-; echo $? >&5) 3>&- |
-        if test $files_with_matches -eq 1; then
-            eval "$grep" >/dev/null && { printf '%s\n' "$i" || exit 2; }
-        elif test $files_without_matches -eq 1; then
-            eval "$grep" >/dev/null || {
-                r=$?
-                if test $r -eq 1; then
-                printf '%s\n' "$i" || r=2
-                fi
-                exit $r
-            }
-        elif test $with_filename -eq 0 && { test $# -eq 1 || test $no_filename -eq 1; }; then
-            eval "$grep"
+EXIT_CODE=0
+# call grep ...
+if [ "$#" -lt 1 ]; then
+    # ... on stdin
+    set -f # Disable file name generation (globbing).
+    # shellcheck disable=SC2086
+    "${zcat}" - | "${grep}" ${grep_args} -- "${pattern}" -
+    EXIT_CODE=$?
+    set +f
+else
+    # ... on all files given on the command line
+    if [ "${silent}" -lt 1 ] && [ "$#" -gt 1 ]; then
+        grep_args="-H ${grep_args}"
+    fi
+    set -f
+    while [ "$#" -gt 0 ]; do
+        # shellcheck disable=SC2086
+        if [ $pattern_found -eq 2 ]; then
+            "${zcat}" -- "$1" | "${grep}" --label="${1}" ${grep_args} -- -
         else
-            case $i in
-            (*'
-        '* | *'&'* | *'\'* | *'|'*)
-                i=$(printf '%s\n' "$i" |
-                    sed '
-                    $!N
-                    $s/[&\|]/\\&/g
-                    $s/\n/\\n/g
-                    ');;
-            esac
-            sed_script="s|^|$i:|"
+            "${zcat}" -- "$1" | "${grep}" --label="${1}" ${grep_args} -- "${pattern}" -
+        fi
+        [ "$?" -ne 0 ] && EXIT_CODE=1
+        shift
+    done
+    set +f
+fi
 
-            # Fail if grep or sed fails.
-            r=$(
-                exec 4>&1
-                (eval "$grep" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
-            ) && exit $r
-            r=$?
-            test 1 -lt $r && exit $r || exit 2
-        fi >&3 5>&-
-    )
-    r=$?
-    test 128 -lt $r && exit $r
-    test "$zcat_status" -eq 0 || test "$zcat_status" -eq 2 || r=2
-    test $res -lt $r && res=$r
-done
-exit $res
+exit "${EXIT_CODE}"