i3 - improved tiling WM

Add file_contents module to print arbitrary file data.

Patch status: superseded

Patch by Luke Heberling

Long description:

This can be used to replace external wrapper scripts with single-purpose
scripts, easily distributable in contrib.

To apply this patch, use:
curl http://cr.i3wm.org/patch/627/raw.patch | git am

b/i3status.c

19 
@@ -402,6 +402,12 @@ int main(int argc, char *argv[]) {
20 
                 CFG_END()
21 
         };
22
23 
+        cfg_opt_t file_contents_opts[] = {
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+                CFG_STR("file", NULL, 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 opts[] = {
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                 CFG_STR_LIST("order", "{}", CFGF_NONE),
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                 CFG_SEC("general", general_opts, CFGF_NONE),
32 
@@ -419,6 +425,7 @@ int main(int argc, char *argv[]) {
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                 CFG_SEC("ddate", ddate_opts, CFGF_NONE),
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                 CFG_SEC("load", load_opts, CFGF_NONE),
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                 CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
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+                CFG_SEC("file_contents", file_contents_opts, CFGF_TITLE | CFGF_MULTI),
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                 CFG_END()
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         };
39
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@@ -652,6 +659,12 @@ int main(int argc, char *argv[]) {
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                                 print_cpu_usage(json_gen, buffer, 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("file_contents") {
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+                                SEC_OPEN_MAP("file_contents");
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+                                print_file_contents(json_gen, buffer, title, cfg_getstr(sec, "file"));
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+                                SEC_CLOSE_MAP;
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+                        }
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                 }
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                 if (output_format == O_I3BAR) {
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                         yajl_gen_array_close(json_gen);

b/include/i3status.h

57 
@@ -184,6 +184,7 @@ void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format);
58 
 void print_eth_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down);
59 
 void print_load(yajl_gen json_gen, char *buffer, const char *format, const float max_threshold);
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 void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *fmt_muted, const char *device, const char *mixer, int mixer_idx);
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+void print_file_contents(yajl_gen json_gen, char *buffer, const char *title, const char *file);
62 
 bool process_runs(const char *path);
63
64 
 /* socket file descriptor for general purposes */

b/man/i3status.man

69 
@@ -47,6 +47,7 @@ general {
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         interval = 5
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 }
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+order += "file_contents motd"
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 order += "ipv6"
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 order += "disk /"
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 order += "run_watch DHCP"
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@@ -60,6 +61,10 @@ order += "load"
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 order += "tztime local"
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 order += "tztime berlin"
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+file_contents motd {
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+	path = "/etc/motd"
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+}
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+
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 wireless wlan0 {
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         format_up = "W: (%quality at %essid, %bitrate) %ip"
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         format_down = "W: down"
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@@ -196,6 +201,11 @@ disk "/" {
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 }
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 -------------------------------------------------------------
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+=== File Contents
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+This module gets the first line of a file, up to 128 characters.
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+
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+*Example path*: +/etc/motd+
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+
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 === IPv6
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99 
 This module gets the IPv6 address used for outgoing connections (that is, the

b/src/print_file_contents.c

105 
@@ -0,0 +1,30 @@
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+#include <stdio.h>
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+#include <string.h>
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+#include <glob.h>
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+#include <yajl/yajl_gen.h>
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+#include <yajl/yajl_version.h>
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+#include "i3status.h"
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+
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+void print_file_contents(yajl_gen json_gen, char *buffer, const char *title, const char *file) {
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+	char *outwalk = buffer;
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+
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+	INSTANCE(title);
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+
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+	static glob_t globbuf;
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+
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+	if (glob(file, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) < 0)
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+		die("glob() failed\n");
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+	// We can't access actual size of buffer here, but it's 4096 currently
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+	if (!slurp((globbuf.gl_pathc > 0 ? globbuf.gl_pathv[0] : file), outwalk, 128))
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+		*outwalk = '\0';
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+	// slurp zero-terminates the buffer
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+
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+	globfree(&globbuf);
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+	char *eol = strchr(outwalk, '\n');
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+	if (eol != NULL) {
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+		outwalk = eol;
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+	} else {
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+		outwalk = strchr(outwalk, '\0');
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+	}
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+	OUTPUT_FULL_TEXT(buffer);
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+}