new: [compose-core] improve the help message of ``compose status`` command

bin/compose-core

@@ -5303,15 +5303,26 @@ Usage: status [options] [SERVICE...]
 
 Options:
     -h, --help      Print this message and quit
-    -a, --all                   Display status of all services
-                                (removes all filter, and will add a
-                                 'root' first column by default)
-    -c, --column                Column to display, can provide several
-                                separated by commas, or option can be repeated.
+
+    -a, --all       Display status of all services (removes all
+                    filter, and will add a 'root' first column by
+                    default)
+
+    -c, --column    Columns to display, can provide several separated
+                    by commas, or option can be repeated.  You can add
+                    a sign prefix to the name of the column to force
+                    the alignment of the column (+: right, -: left),
                     (default: ${state_columns_default_msg})
+
     -f, --filter    Filter services by a key=value pair,
                     separated by commas or can be repeated.
                     (default: --filter root=yes)
+
+    -r, --raw       Raw data output (no colors nor alignment)
+
+    -0              Separate field with NUL char. Implies raw data
+                    output.
+
 "
         while read-0 arg; do
             case "$arg" in
@@ -5319,6 +5330,19 @@ Options:
                     echo "$help"
                     exit 0
                     ;;
+                --raw|-r|-0)
+                    state_raw_output="$arg";
+                    ## check if any state_columns have alignements specs
+                    for col in "${state_columns[@]}"; do
+                        if [[ "$col" == [-+]* ]]; then
+                            err "Cannot use $arg and provide columns with alignment specs."
+                            exit 1
+                        fi
+                    done
+                    if [[ "$arg" == "-0" ]]; then
+                        state_raw_output_nul=1
+                    fi
+                    ;;
                 --all|-a)
                     if [ "${#state_services[@]}" -gt 0 ]; then
                         err "Cannot use --all and provide services at the same time."
@@ -5333,10 +5357,19 @@ Options:
                 --column|-c)
                     read-0 value
                     if [[ "$value" == *,* ]]; then
-                        state_columns+=(${value//,/ })
+                        state_columns_candidate=(${value//,/ })
                     else
-                        state_columns+=("$value")
+                        state_columns_candidate=("$value")
+                    fi
+                    if [[ -n "$state_raw_output" ]]; then
+                        for col in "${state_columns_candidate[@]}"; do
+                            if [[ "$col" == [-+]* ]]; then
+                                err "Cannot use ${state_raw_output} and provide columns with alignment specs."
+                                exit 1
                             fi
+                        done
+                    fi
+                    state_columns+=("${state_columns_candidate[@]}")
                     ;;
                 --filter|-f)
                     if [ "${#state_services[@]}" -gt 0 ]; then
@@ -5704,6 +5737,7 @@ if [ "$action" == "status" ]; then
         for col in "${state_columns_raw[@]}"; do
             color=
             value="${!col}"
+            if [ -z "$state_raw_output" ]; then
                 read -r -- value_trim <<<"${!col}"
                 case "${col//_/-}" in
                     root)
@@ -5736,6 +5770,7 @@ if [ "$action" == "status" ]; then
                         ;;
                 esac
                 color="${color^^}"
+            fi
             if [ -n "$color" ]; then
                 values+=("${!color}$value${NORMAL}")
             else
@@ -5746,12 +5781,20 @@ if [ "$action" == "status" ]; then
         for value in "${values[@]}"; do
             if [ -n "$first" ]; then
                 first=
+            else
+                if [ -n "$state_raw_output_nul" ]; then
+                    printf "\0"
                 else
                     printf " "
                 fi
+            fi
             printf "%s" "$value"
         done
+        if [ -n "$state_raw_output_nul" ]; then
+            printf "\0"
+        else
             printf "\n"
+        fi
     done < <(
         set -o pipefail
         filter_cols=()
@@ -5812,7 +5855,13 @@ if [ "$action" == "status" ]; then
             for col in "${state_columns_raw[@]}"; do
                 p0 "${values[$col]}"
             done
-        done | col-0:normalize:size "${state_columns_align}"
+        done | {
+            if [ -z "$state_raw_output" ]; then
+                col-0:normalize:size "${state_columns_align}"
+            else
+                cat
+            fi
+        }
         echo 0
     )
     if [ "$E" != 0 ]; then