From ab9fe663178272812f83e496c428813e3611368f Mon Sep 17 00:00:00 2001
From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Wed, 29 Aug 2018 11:09:29 -0400
Subject: [PATCH] Implement user-selected status bar components

---
 README.md                      |  3 +++
 bin/khatus_bar                 | 26 ++---------------------
 bin/khatus_gen_make_status_bar | 39 ++++++++++++++++++++++++++++++++++
 sanity_check                   |  3 +++
 4 files changed, 47 insertions(+), 24 deletions(-)
 create mode 100755 bin/khatus_gen_make_status_bar

diff --git a/README.md b/README.md
index f95d159..169b7d2 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,9 @@ In my `~/.xinitrc` I have something like the following:
         -v Opt_Mpd_Song_Max_Chars=10 \
         -v Opt_Net_Interfaces_To_Show=wlp3s0 \
         -v Opt_Pulseaudio_Sink=0 \
+        -f <(./bin/khatus_gen_make_status_bar \
+                -v Status_Bar='@energy,@memory,@processes,@cpu,@disk,@net,@bluetooth,@backlight,@volume,@mpd,@weather,@datetime' \
+            ) \
     | "$BIN"/khatus_actuate_status_bar_to_xsetroot_name \
     ) \
     >(stdbuf -o L "$BIN"/khatus_monitor_energy \
diff --git a/bin/khatus_bar b/bin/khatus_bar
index 6fa05ba..b1e9e36 100755
--- a/bin/khatus_bar
+++ b/bin/khatus_bar
@@ -45,6 +45,8 @@ $1 == "OK" {
 
 $1 == "OK" && \
 $2 == "khatus_sensor_datetime" {
+    # Code for make_status_bar definition is expected to be passed as an
+    # additional source file, using  -f  flag.
     print_msg_ok("status_bar", make_status_bar())
 }
 
@@ -141,30 +143,6 @@ function cache_maybe_scale(src, key, val,    key_parts) {
 # Status bar
 # -----------------------------------------------------------------------------
 
-function make_status_bar(    position, bar, sep, i, j) {
-    position[++i] = ""
-    position[++i] = make_status_energy()
-    position[++i] = make_status_mem()
-    position[++i] = make_status_procs()
-    position[++i] = make_status_cpu()
-    position[++i] = make_status_disk()
-    position[++i] = make_status_net()
-    position[++i] = make_status_bluetooth()
-    position[++i] = make_status_screen_brightness()
-    position[++i] = make_status_volume()
-    position[++i] = make_status_mpd()
-    position[++i] = make_status_weather()
-    position[++i] = make_status_datetime()
-    position[++i] = ""
-    bar = ""
-    sep = ""
-    for (j = 1; j <= i; j++) {
-        bar = bar sep position[j]
-        sep = " "
-    }
-    return bar
-}
-
 function make_status_energy(    state, charge, direction_of_change) {
     cache_get(state , "khatus_sensor_energy", "battery_state"     , 0)
     cache_get(charge, "khatus_sensor_energy", "battery_percentage", 0)
diff --git a/bin/khatus_gen_make_status_bar b/bin/khatus_gen_make_status_bar
new file mode 100755
index 0000000..50e1b03
--- /dev/null
+++ b/bin/khatus_gen_make_status_bar
@@ -0,0 +1,39 @@
+#! /usr/bin/awk -f
+
+BEGIN {
+    aliases["@energy"]    = "make_status_energy()"
+    aliases["@memory"]    = "make_status_mem()"
+    aliases["@processes"] = "make_status_procs()"
+    aliases["@cpu"]       = "make_status_cpu()"
+    aliases["@disk"]      = "make_status_disk()"
+    aliases["@net"]       = "make_status_net()"
+    aliases["@bluetooth"] = "make_status_bluetooth()"
+    aliases["@backlight"] = "make_status_screen_brightness()"
+    aliases["@volume"]    = "make_status_volume()"
+    aliases["@mpd"]       = "make_status_mpd()"
+    aliases["@weather"]   = "make_status_weather()"
+    aliases["@datetime"]  = "make_status_datetime()"
+    out = "function make_status_bar(    position, bar, sep, i, j) {\n"
+    n = split(Status_Bar, s, ",")
+    for (i=1; i<=n; i++) {
+        alias = s[i]
+        function_call = aliases[alias]
+        if (function_call) {
+            out = out "        position[++i] = " function_call ";\n"
+        } else {
+            printf("Unexpected status bar component alias: \"%s\"\n", alias) \
+                > "/dev/stderr"
+            exit(1)
+        }
+    }
+    out = out "\
+        bar = \"\";\
+        sep = \"\";\
+        for (j = 1; j <= i; j++) {\
+           bar = bar sep position[j];\
+           sep = \" \";\
+        }\
+        return bar;\
+    }";
+    print out
+}
diff --git a/sanity_check b/sanity_check
index 8b7f969..b9022a1 100755
--- a/sanity_check
+++ b/sanity_check
@@ -9,6 +9,9 @@
         -v Opt_Net_Interfaces_To_Show=wlp3s0 \
         -v Opt_Pulseaudio_Sink=0 \
         -v GC_Interval=300 \
+        -f <(./bin/khatus_gen_make_status_bar \
+                -v Status_Bar='@energy,@memory,@processes,@cpu,@disk,@net,@bluetooth,@backlight,@volume,@mpd,@weather,@datetime' \
+            ) \
     ) \
     >(stdbuf -o L ./bin/khatus_monitor_energy) \
     >(stdbuf -o L ./bin/khatus_monitor_errors) \
-- 
2.20.1