i3 - improved tiling WM

Add support for path_exists directive.

Patch status: needinfo

Patch by Kinware AB

To apply this patch, use:
curl http://cr.i3wm.org/patch/319/raw.patch | git am

b/i3status.c

18 
@@ -210,6 +210,13 @@ int main(int argc, char *argv[]) {
19 
                 CFG_END()
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         };
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+        cfg_opt_t path_exists_opts[] = {
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+                CFG_STR("path", NULL, CFGF_NONE),
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+                CFG_STR("format", "%title: %status", CFGF_NONE),
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+                CFG_CUSTOM_COLOR_OPTS,
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+                CFG_END()
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+        };
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+
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         cfg_opt_t wireless_opts[] = {
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                 CFG_STR("format_up", "W: (%quality at %essid, %bitrate) %ip", CFGF_NONE),
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                 CFG_STR("format_down", "W: down", CFGF_NONE),
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@@ -297,6 +304,7 @@ int main(int argc, char *argv[]) {
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                 CFG_STR_LIST("order", "{}", CFGF_NONE),
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                 CFG_SEC("general", general_opts, CFGF_NONE),
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                 CFG_SEC("run_watch", run_watch_opts, CFGF_TITLE | CFGF_MULTI),
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+                CFG_SEC("path_exists", path_exists_opts, CFGF_TITLE | CFGF_MULTI),
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                 CFG_SEC("wireless", wireless_opts, CFGF_TITLE | CFGF_MULTI),
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                 CFG_SEC("ethernet", ethernet_opts, CFGF_TITLE | CFGF_MULTI),
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                 CFG_SEC("battery", battery_opts, CFGF_TITLE | CFGF_MULTI),
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@@ -480,6 +488,12 @@ int main(int argc, char *argv[]) {
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                                 SEC_CLOSE_MAP;
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                         }
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+                        CASE_SEC_TITLE("path_exists") {
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+                                SEC_OPEN_MAP("path_exists");
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+                                print_path_exists(json_gen, buffer, title, cfg_getstr(sec, "path"), cfg_getstr(sec, "format"));
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+                                SEC_CLOSE_MAP;
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+                        }
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+
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                         CASE_SEC_TITLE("disk") {
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                                 SEC_OPEN_MAP("disk_info");
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                                 print_disk_info(json_gen, buffer, title, cfg_getstr(sec, "format"));

b/include/i3status.h

57 
@@ -152,6 +152,7 @@ void print_ddate(yajl_gen json_gen, char *buffer, const char *format, time_t t);
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 const char *get_ip_addr();
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 void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down);
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 void print_run_watch(yajl_gen json_gen, char *buffer, const char *title, const char *pidfile, const char *format);
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+void print_path_exists(yajl_gen json_gen, char *buffer, const char *title, const char *path, const char *format);
62 
 void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const char *path, const char *format, int);
63 
 void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format);
64 
 void print_eth_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down);

b/man/i3status.man

69 
@@ -50,7 +50,8 @@ general {
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 order += "ipv6"
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 order += "disk /"
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 order += "run_watch DHCP"
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-order += "run_watch VPN"
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+order += "run_watch VPNC"
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+order += "path_exists VPN"
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 order += "wireless wlan0"
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 order += "ethernet eth0"
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 order += "battery 0"
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@@ -81,10 +82,16 @@ run_watch DHCP {
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         pidfile = "/var/run/dhclient*.pid"
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 }
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-run_watch VPN {
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+run_watch VPNC {
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+        # file containing the PID of a vpnc process
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         pidfile = "/var/run/vpnc/pid"
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 }
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+path_exists VPN {
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+        # path exists when a VPN tunnel launched by nmcli/nm-applet is active
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+        path = "/proc/sys/net/ipv4/conf/tun0"
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+}
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+
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 tztime local {
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         format = "%Y-%m-%d %H:%M:%S"
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 }
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@@ -193,6 +200,16 @@ a specific application, such as a VPN client or your DHCP client is running.
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 *Example format*: +%title: %status+
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+=== Path-exists
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+
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+Expands the given path and checks if it exists in the filesystem. You can use
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+this to check if something is active, like for example a VPN tunnel managed by
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+NetworkManager.
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+
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+*Example order*: +path_exists VPN+
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+
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+*Example format*: +%title: %status+
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+
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 === Wireless
112
113 
 Gets the link quality and ESSID of the given wireless network interface. You

b/src/general.c

118 
@@ -6,6 +6,7 @@
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 #include <stdlib.h>
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 #include <unistd.h>
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 #include <sys/fcntl.h>
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+#include <sys/stat.h>
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124 
 #include "i3status.h"
125

b/src/print_path_exists.c

131 
@@ -0,0 +1,35 @@
132 
+#include <stdio.h>
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+#include <string.h>
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+#include <yajl/yajl_gen.h>
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+#include <yajl/yajl_version.h>
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+#include <sys/stat.h>
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+#include "i3status.h"
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+
139 
+void print_path_exists(yajl_gen json_gen, char *buffer, const char *title, const char *path, const char *format) {
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+        const char *walk;
141 
+        char *outwalk = buffer;
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+        struct stat st;
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+        const bool exists = (stat(path, &st) == 0);
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+
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+        INSTANCE(path);
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+
147 
+        START_COLOR((exists ? "color_good" : "color_bad"));
148 
+
149 
+        for (walk = format; *walk != '\0'; walk++) {
150 
+                if (*walk != '%') {
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+                        *(outwalk++) = *walk;
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+                        continue;
153 
+                }
154 
+
155 
+                if (strncmp(walk+1, "title", strlen("title")) == 0) {
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+                        outwalk += sprintf(outwalk, "%s", title);
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+                        walk += strlen("title");
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+                } else if (strncmp(walk+1, "status", strlen("status")) == 0) {
159 
+                        outwalk += sprintf(outwalk, "%s", (exists ? "yes" : "no"));
160 
+                        walk += strlen("status");
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+                }
162 
+        }
163 
+
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+        END_COLOR;
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+        OUTPUT_FULL_TEXT(buffer);
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+}