feat: Add basename support

Now, the user can decide to show only the program name, instead of the
full program path. It is useful, when you have a very long hierarchy of
directories, which, with the full path name, the user might not see the
program name.

doc/nethogs.8

@@ -19,6 +19,7 @@ nethogs \- Net top tool grouping bandwidth per process
 .RB [ "\-l" ]
 .RB [ "\-f filter" ]
 .RB [ "\-C" ]
+.RB [ "\-b" ]
 .RB [ "\-g period" ]
 .RI [device(s)]
 .SH DESCRIPTION
@@ -62,6 +63,9 @@ monitor all devices, even loopback/stopped ones.
 \fB-C\fP
 capture TCP and UDP.
 .TP
+\fB-b\fP
+Display the program basename.
+.TP
 \fB-g\fP
 garbage collection period in number of refresh. default is 50.
 .TP
@@ -86,6 +90,9 @@ sort by RECEIVED traffic
 l
 display command line
 .TP
+b
+display the program basename
+.TP
 m
 switch between total (KB, B, MB) and throughput (KB/s, MB/s, GB/s) mode
 .RE

src/cui.cpp

@@ -26,6 +26,7 @@
 #include <cstdlib>
 #include <pwd.h>
 #include <string>
+#include <strings.h>
 #include <sys/types.h>
 
 #include "nethogs.h"
@@ -45,6 +46,7 @@ extern bool sortRecv;
 
 extern int viewMode;
 extern bool showcommandline;
+extern bool showBasename;
 
 extern unsigned refreshlimit;
 extern unsigned refreshcount;
@@ -67,6 +69,8 @@ const char *COLUMN_FORMAT_RECEIVED = "%11.3f";
 const char *const desc_view_mode[VIEWMODE_COUNT] = {
     "KB/sec", "KB    ", "B     ", "MB    ", "MB/sec", "GB/sec"};
 
+constexpr char FILE_SEPARATOR = '/';
+
 class Line {
 public:
   Line(const char *name, const char *cmdline, double n_recv_value,
@@ -152,6 +156,12 @@ static void mvaddstr_truncate_trailing(int row, int col, const char *str,
 static void mvaddstr_truncate_cmdline(int row, int col, const char *progname,
                                       const char *cmdline,
                                       std::size_t max_len) {
+  if (showBasename) {
+    if (index(progname, FILE_SEPARATOR) != NULL) {
+      progname = rindex(progname, FILE_SEPARATOR) + 1;
+    } 
+  }                                      
+
   std::size_t proglen = strlen(progname);
   std::size_t max_cmdlen;
 
@@ -305,6 +315,10 @@ void ui_tick() {
     /* switch mode: total vs kb/s */
     viewMode = (viewMode + 1) % VIEWMODE_COUNT;
     break;
+  case 'b':
+    /* show only the process basename */
+    showBasename = !showBasename;
+    break;
   }
 }
 

src/main.cpp

@@ -27,7 +27,7 @@ static void help(bool iserror) {
   // output << "usage: nethogs [-V] [-b] [-d seconds] [-t] [-p] [-f (eth|ppp))]
   // [device [device [device ...]]]\n";
   output << "usage: nethogs [-V] [-h] [-x] [-d seconds] [-v mode] [-c count] "
-            "[-t] [-p] [-s] [-a] [-l] [-f filter] [-C]"
+            "[-t] [-p] [-s] [-a] [-l] [-f filter] [-C] [-b]"
             "[device [device [device ...]]]\n";
   output << "		-V : prints version.\n";
   output << "		-h : prints this help.\n";
@@ -48,6 +48,7 @@ static void help(bool iserror) {
   output << "		-C : capture TCP and UDP.\n";
   output << "		-g : garbage collection period in number of refresh. "
             "default is 50.\n";
+  output << "		-b : Short program name. Displays only the program name.\n";
   output << "		-f : EXPERIMENTAL: specify string pcap filter (like "
             "tcpdump)."
             " This may be removed or changed in a future version.\n";
@@ -59,6 +60,7 @@ static void help(bool iserror) {
   output << " s: sort by SENT traffic\n";
   output << " r: sort by RECEIVED traffic\n";
   output << " l: display command line\n";
+  output << " b: display the program basename instead of the fullpath\n";
   output << " m: switch between total (KB, B, MB) and throughput (KB/s, MB/s, "
             "GB/s) mode\n";
 }
@@ -145,7 +147,7 @@ int main(int argc, char **argv) {
   int garbage_collection_period = 50;
 
   int opt;
-  while ((opt = getopt(argc, argv, "Vhxtpsd:v:c:laf:Cg:")) != -1) {
+  while ((opt = getopt(argc, argv, "Vhxtpsd:v:c:laf:Cbg:")) != -1) {
     switch (opt) {
     case 'V':
       versiondisplay();
@@ -187,6 +189,9 @@ int main(int argc, char **argv) {
     case 'C':
       catchall = true;
       break;
+    case 'b':
+      showBasename = true;
+      break;
     case 'g':
       garbage_collection_period = (time_t)atoi(optarg);
       break;

src/nethogs.cpp

@@ -60,6 +60,7 @@ bool bughuntmode = false;
 // sort on sent or received?
 bool sortRecv = true;
 bool showcommandline = false;
+bool showBasename = false;
 // viewMode: kb/s or total
 int viewMode = VIEWMODE_KBPS;
 const char version[] = " version " VERSION;