Print elements per line instead of all in a single line.
The elements which can be 'short' are printed 5 per line,
and others, like IPv4 addresses are printed 2 per line.

Example:

% nft list ruleset -nnn
table ip t {
        set s {
                type inet_service
                elements = { 1, 2, 3, 4, 10,
                             432, 433, 434, 435, 436,
                             437, 438, 439, 440, 441,
                             442, 443, 444, 445, 446,
                             447, 448, 449, 450, 12345 }
        }

        map m {
                type inet_service . iface_index : verdict
                elements = { 123 . "lo" : accept,
                             1234 . "lo" : accept,
                             12345 . "lo" : accept,
                             12346 . "lo" : accept,
                             12347 . "lo" : accept }
        }

        set s3 {
                type ipv4_addr
                elements = { 1.1.1.1, 2.2.2.2,
                             3.3.3.3 }
        }
}

Signed-off-by: Arturo Borrero Gonzalez <[email protected]>
---
v2: align column using spaces rather than tabs.
    Cleanup unused variables and declarations.

v3: update testcases which depends on sets textual output

 .../testcases/maps/0003map_add_many_elements_0     |   15 +++++++++++----
 .../testcases/maps/0004interval_map_create_once_0  |   15 +++++++++++----
 .../maps/0005interval_map_add_many_elements_0      |   15 +++++++++++----
 3 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/src/expression.c b/src/expression.c
index 45f3ed8..5defa63 100644
--- a/src/expression.c
+++ b/src/expression.c
@@ -742,10 +742,66 @@ struct expr *list_expr_alloc(const struct location *loc)
        return compound_expr_alloc(loc, &list_expr_ops);
 }
 
+static const char *calculate_delim(const struct expr *expr, int *count)
+{
+       const char *newline = ",\n\t\t\t     ";
+       const char *singleline = ", ";
+
+       if (expr->set_flags & NFT_SET_ANONYMOUS)
+               return singleline;
+
+       if (!expr->dtype)
+               return newline;
+
+       switch (expr->dtype->type) {
+       case TYPE_NFPROTO:
+       case TYPE_INTEGER:
+       case TYPE_ARPOP:
+       case TYPE_INET_PROTOCOL:
+       case TYPE_INET_SERVICE:
+       case TYPE_TCP_FLAG:
+       case TYPE_DCCP_PKTTYPE:
+       case TYPE_MARK:
+       case TYPE_IFINDEX:
+       case TYPE_CLASSID:
+       case TYPE_UID:
+       case TYPE_GID:
+       case TYPE_CT_DIR:
+               if (*count < 5)
+                       return singleline;
+               *count = 0;
+               break;
+       case TYPE_IPADDR:
+       case TYPE_CT_STATE:
+       case TYPE_CT_STATUS:
+       case TYPE_PKTTYPE:
+               if (*count < 2)
+                       return singleline;
+               *count = 0;
+               break;
+
+       default:
+               break;
+       }
+
+       return newline;
+}
+
 static void set_expr_print(const struct expr *expr)
 {
+       const struct expr *i;
+       const char *d = "";
+       int count = 0;
+
        printf("{ ");
-       compound_expr_print(expr, ", ");
+
+       list_for_each_entry(i, &expr->expressions, list) {
+               printf("%s", d);
+               expr_print(i);
+               count++;
+               d = calculate_delim(expr, &count);
+       }
+
        printf(" }");
 }
 
diff --git a/src/netlink.c b/src/netlink.c
index 6fbb67d..59e8918 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -1730,6 +1730,8 @@ int netlink_get_setelems(struct netlink_ctx *ctx, const 
struct handle *h,
        ctx->set = set;
        set->init = set_expr_alloc(loc);
        nftnl_set_elem_foreach(nls, list_setelem_cb, ctx);
+       set->init->set_flags = set->flags;
+       set->init->dtype = set->keytype;
 
        if (!(set->flags & NFT_SET_INTERVAL))
                list_expr_sort(&ctx->set->init->expressions);
diff --git a/tests/shell/testcases/maps/0003map_add_many_elements_0 
b/tests/shell/testcases/maps/0003map_add_many_elements_0
index 36b1be2..047f949 100755
--- a/tests/shell/testcases/maps/0003map_add_many_elements_0
+++ b/tests/shell/testcases/maps/0003map_add_many_elements_0
@@ -24,15 +24,22 @@ generate_add() {
 }
 
 generate_test() {
+       count=0
        elements=""
        for ((i=1; i<=HOWMANY; i++)) ; do
                for ((j=1; j<=HOWMANY; j++)) ; do
-                       elements="$elements 10.0.${i}.${j} : 10.0.${i}.${j}"
+                       ((count++))
+                       elements="${elements}10.0.${i}.${j} : 10.0.${i}.${j}"
                        [ "$i" == "$HOWMANY" ] && [ "$j" == "$HOWMANY" ] && 
break
-                       elements="${elements}, "
+                       if [ "$count" == "2" ] ; then
+                               count=0
+                               elements="${elements},\\n\\t\\t\\t     "
+                       else
+                               elements="${elements}, "
+                       fi
                done
        done
-       echo $elements
+       echo -e "$elements"
 }
 
 echo "add table x
@@ -49,7 +56,7 @@ $NFT -f $tmpfile
 EXPECTED="table ip x {
        map y {
                type ipv4_addr : ipv4_addr
-               elements = { $(generate_test) }
+               elements = { "$(generate_test)" }
        }
 }"
 GET=$($NFT list ruleset)
diff --git a/tests/shell/testcases/maps/0004interval_map_create_once_0 
b/tests/shell/testcases/maps/0004interval_map_create_once_0
index 1f04387..58b399c 100755
--- a/tests/shell/testcases/maps/0004interval_map_create_once_0
+++ b/tests/shell/testcases/maps/0004interval_map_create_once_0
@@ -26,15 +26,22 @@ generate_add() {
 }
 
 generate_test() {
+       count=0
        elements=""
        for ((i=1; i<=HOWMANY; i++)) ; do
                for ((j=1; j<=HOWMANY; j++)) ; do
-                       elements="$elements 10.${i}.${j}.0/24 : 10.0.${i}.${j}"
+                       ((count++))
+                       elements="${elements}10.${i}.${j}.0/24 : 10.0.${i}.${j}"
                        [ "$i" == "$HOWMANY" ] && [ "$j" == "$HOWMANY" ] && 
break
-                       elements="${elements}, "
+                       if [ "$count" == "2" ] ; then
+                               count=0
+                               elements="${elements},\\n\\t\\t\\t     "
+                       else
+                               elements="${elements}, "
+                       fi
                done
        done
-       echo $elements
+       echo -e "$elements"
 }
 
 echo "add table x
@@ -48,7 +55,7 @@ EXPECTED="table ip x {
        map y {
                type ipv4_addr : ipv4_addr
                flags interval
-               elements = { $(generate_test) }
+               elements = { "$(generate_test)" }
        }
 }"
 GET=$($NFT list ruleset)
diff --git a/tests/shell/testcases/maps/0005interval_map_add_many_elements_0 
b/tests/shell/testcases/maps/0005interval_map_add_many_elements_0
index 4d4f708..55f9055 100755
--- a/tests/shell/testcases/maps/0005interval_map_add_many_elements_0
+++ b/tests/shell/testcases/maps/0005interval_map_add_many_elements_0
@@ -27,15 +27,22 @@ generate_add() {
 }
 
 generate_test() {
+       count=0
        elements=""
        for ((i=1; i<=HOWMANY; i++)) ; do
                for ((j=1; j<=HOWMANY; j++)) ; do
-                       elements="$elements 10.${i}.${j}.0/24 : 10.0.${i}.${j}"
+                       ((count++))
+                       elements="${elements}10.${i}.${j}.0/24 : 10.0.${i}.${j}"
                        [ "$i" == "$HOWMANY" ] && [ "$j" == "$HOWMANY" ] && 
break
-                       elements="${elements}, "
+                       if [ "$count" == "2" ] ; then
+                               count=0
+                               elements="${elements},\\n\\t\\t\\t     "
+                       else
+                               elements="${elements}, "
+                       fi
                done
        done
-       echo $elements
+       echo -e "$elements"
 }
 
 echo "add table x
@@ -54,7 +61,7 @@ EXPECTED="table ip x {
        map y {
                type ipv4_addr : ipv4_addr
                flags interval
-               elements = { $(generate_test) }
+               elements = { "$(generate_test)" }
        }
 }"
 GET=$($NFT list ruleset)

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