netdev - [PATCH iproute2 net-next 3/3] ss: Beautify output when arbitrary columns are hidden

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Date:   Tue, 30 Oct 2018 16:05:20 +0100
From:   Stefano Brivio <sbrivio@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     "Yoann P." <yoann.p.public@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: [PATCH iproute2 net-next 3/3] ss: Beautify output when arbitrary columns are hidden

Define a secondary alignment for columns in case the next column is
hidden, this avoids awkward outputs if e.g. the local address is shown,
but not the local port.

Omit embedded delimiter in socket specifiers if the port or service field
is hidden.

Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
---
 misc/ss.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index 91be3c6db151..d489233681e9 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -131,7 +131,8 @@ enum col_align {
 };
 
 struct column {
-	const enum col_align align;
+	enum col_align align;
+	const enum col_align align_without_next;
 	const char *optname;
 	const char *header;
 	const char *ldelim;
@@ -141,15 +142,15 @@ struct column {
 };
 
 static struct column columns[] = {
-	{ ALIGN_LEFT,	"netid",	"Netid",		"",  0, 0, 0 },
-	{ ALIGN_LEFT,	"state",	"State",		" ", 0, 0, 0 },
-	{ ALIGN_LEFT,	"recvq",	"Recv-Q",		" ", 0, 0, 0 },
-	{ ALIGN_LEFT,	"sendq",	"Send-Q",		" ", 0, 0, 0 },
-	{ ALIGN_RIGHT,	"local",	"Local Address:",	" ", 0, 0, 0 },
-	{ ALIGN_LEFT,	"lport",	"Port",			"",  0, 0, 0 },
-	{ ALIGN_RIGHT,	"peer",		"Peer Address:",	" ", 0, 0, 0 },
-	{ ALIGN_LEFT,	"pport",	"Port",			"",  0, 0, 0 },
-	{ ALIGN_LEFT,	"ext",		"",			"",  0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "netid", "Netid",          "",  0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "state", "State",          " ", 0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "recvq", "Recv-Q",         " ", 0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "sendq", "Send-Q",         " ", 0, 0, 0 },
+	{ ALIGN_RIGHT, ALIGN_LEFT, "local", "Local Address:", " ", 0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "lport", "Port",           "",  0, 0, 0 },
+	{ ALIGN_RIGHT, ALIGN_LEFT, "peer",  "Peer Address:",  " ", 0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "pport", "Port",           "",  0, 0, 0 },
+	{ ALIGN_LEFT,  ALIGN_LEFT, "ext",   "",               "",  0, 0, 0 },
 };
 
 static struct column *current_field = columns;
@@ -1374,6 +1375,9 @@ static void sock_details_print(struct sockstat *s)
 static void sock_addr_print(const char *addr, char *delim, const char *port,
 		const char *ifname)
 {
+	if ((current_field + 1)->disabled)
+		delim = "";
+
 	if (ifname)
 		out("%s" "%%" "%s%s", addr, ifname, delim);
 	else
@@ -5006,6 +5010,12 @@ int main(int argc, char *argv[])
 				}
 				p = p1 + 1;
 			} while (p1);
+
+			for (f = columns; field_is_valid(f + 1); f++) {
+				if ((f + 1)->disabled)
+					f->align = f->align_without_next;
+			}
+
 			break;
 		}
 		case 'h':
-- 
2.19.1