Dynamically resize xmobar for trayer

home/.config/xmobar/multi_mon.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 if [ $# -lt 1 ]; then
     echo "Invalid amount of arguments passed!"
@@ -10,7 +10,7 @@ MONITOR_AMOUT="$1"
 WIDTH=1920
 WORK_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/xmobar"
 
-make_line(){
+make_position_line(){
     xpos=$(($1 * $WIDTH))
     line=", position = Static { xpos = $xpos, ypos = 0, width = $WIDTH, height = 24 }"
     echo "$line"
@@ -20,8 +20,22 @@ make_line(){
 # Remove all already existing specific xmobar configurations
 find $WORK_DIR -regex '\./xmobarrc[0-9]+' -exec rm {} +
 
+xmobarhs_content="$(cat $WORK_DIR/xmobarrc.hs)"
+position_line_0="$(make_position_line 0)"
+
 for ((n=0;n<MONITOR_AMOUT;n++)); do
     cur_file="$WORK_DIR/xmobarrc$n"
-    sed "s/$(make_line 0)/$(make_line $n)/g" "$WORK_DIR/xmobarrc.hs" > "$cur_file"
+
+    # Replace position line to accomodate for multiple monitors
+    position_line="$(make_position_line $n)"
+    contents="${xmobarhs_content/$position_line_0/$position_line}"
+
+    # Only keep trayer spacer in 1st xmobar
+    if [ $n -ne 0 ]; then
+        #contents="${contents/'%trayerpad%'/''}"
+        contents="$(grep -v trayerpad <<< $contents)"
+    fi
+
+    echo "$contents" > "$cur_file"
     echo "$cur_file created."
 done

home/.config/xmobar/trayer-padding-icon.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+# Copied from https://github.com/jaor/xmobar/issues/239#issuecomment-233206552
+# Detects the width of running trayer-srg window (xprop name 'panel')
+# and creates an XPM icon of that width, 1px height, and transparent.
+# Outputs an <icon>-tag for use in xmobar to display the generated
+# XPM icon.
+#
+# Run script from xmobar:
+# `Run Com "/where/ever/trayer-padding-icon.sh" [] "trayerpad" 10`
+# and use `%trayerpad%` in your template.
+
+
+# Function to create a transparent Wx1 px XPM icon
+create_xpm_icon () {
+    timestamp=$(date)
+    pixels=$(for i in `seq $1`; do echo -n "."; done)
+
+    cat << EOF > "$2"
+/* XPM *
+static char * trayer_pad_xpm[] = {
+/* This XPM icon is used for padding in xmobar to */
+/* leave room for trayer-srg. It is dynamically   */
+/* updated by by trayer-padding-icon.sh which is run  */
+/* by xmobar.                                     */
+/* Created: ${timestamp} */
+/* <w/cols>  <h/rows>  <colors>  <chars per pixel> */
+"$1 1 1 1",
+/* Colors (none: transparent) */
+". c none",
+/* Pixels */
+"$pixels"
+};
+EOF
+}
+
+# Width of the trayer window
+width=$(xprop -name panel | grep 'program specified minimum size' | cut -d ' ' -f 5)
+
+# Icon file name
+iconfile="/tmp/trayer-padding-${width}px.xpm"
+
+# If the desired icon does not exist create it
+if [ ! -f $iconfile ]; then
+    create_xpm_icon $width $iconfile
+fi
+
+# Output the icon tag for xmobar
+echo "<icon=${iconfile}/>"
+

home/.config/xmobar/xmobarrc.hs

@@ -12,7 +12,8 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
        , hideOnStart = False
        , allDesktops = True
        , persistent = True
-       --, iconRoot = "."  -- default: "."
+       -- apparently there's no way to use env var or relpaths here
+       , iconRoot = "/home/itsdrike/.config/xmobar/xpm"
        , commands = [
                     -- Time and date
                       Run Date "<fn=2>\xf017</fn>  %b %d %Y - (%H:%M) " "date" 50
@@ -26,6 +27,10 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
                     , Run DiskU [("/", "<fn=2>\xf0c7</fn>  hdd: <free> free")] [] 60
                     -- Runs a standard shell command 'uname -r' to get kernel version
                     , Run Com "uname" ["-r"] "" 3600
+                    -- Add dynamic invisible XPM icon that resizes to accomodate trayer
+                    -- this needs to be an absolute string path, env vars or relpaths aren't accepted
+                    -- this should only be on 1 monitor (single file), so ignore this comment on others
+                    , Run Com "/home/itsdrike/.config/xmobar/trayer-padding-icon.sh" [] "trayerpad" 10
                     -- Allow mouse clicking by using unsafe stdin reader
                     , Run UnsafeStdinReader
                     ]
@@ -37,7 +42,9 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
        \<fc=#666666>|</fc>   <fc=#ff6c6b> <action=`alacritty -e htop`>%memory%</action> </fc> \
        \<fc=#666666>|</fc>   <fc=#51afef> <action=`alacritty -e htop`>%disku%</action> </fc> \
        \<fc=#666666>|</fc>   <fc=#98be65> <action=`alacritty -e sudo iftop`>%wlp2s0%</action> </fc> \
-       \<fc=#666666>|</fc>   <fc=#46d9ff> %date% </fc>"
+       \<fc=#666666>|</fc>   <fc=#46d9ff> %date% </fc> \
+       \%trayerpad%\
+       \ "
        }
 
 

home/.config/xmobar/xmobarrc0

@@ -12,7 +12,8 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
        , hideOnStart = False
        , allDesktops = True
        , persistent = True
-       --, iconRoot = "."  -- default: "."
+       -- apparently there's no way to use env var or relpaths here
+       , iconRoot = "/home/itsdrike/.config/xmobar/xpm"
        , commands = [
                     -- Time and date
                       Run Date "<fn=2>\xf017</fn>  %b %d %Y - (%H:%M) " "date" 50
@@ -26,6 +27,10 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
                     , Run DiskU [("/", "<fn=2>\xf0c7</fn>  hdd: <free> free")] [] 60
                     -- Runs a standard shell command 'uname -r' to get kernel version
                     , Run Com "uname" ["-r"] "" 3600
+                    -- Add dynamic invisible XPM icon that resizes to accomodate trayer
+                    -- this needs to be an absolute string path, env vars or relpaths aren't accepted
+                    -- this should only be on 1 monitor (single file), so ignore this comment on others
+                    , Run Com "/home/itsdrike/.config/xmobar/trayer-padding-icon.sh" [] "trayerpad" 10
                     -- Allow mouse clicking by using unsafe stdin reader
                     , Run UnsafeStdinReader
                     ]
@@ -37,7 +42,7 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
        \<fc=#666666>|</fc>   <fc=#ff6c6b> <action=`alacritty -e htop`>%memory%</action> </fc> \
        \<fc=#666666>|</fc>   <fc=#51afef> <action=`alacritty -e htop`>%disku%</action> </fc> \
        \<fc=#666666>|</fc>   <fc=#98be65> <action=`alacritty -e sudo iftop`>%wlp2s0%</action> </fc> \
-       \<fc=#666666>|</fc>   <fc=#46d9ff> %date% </fc>"
+       \<fc=#666666>|</fc>   <fc=#46d9ff> %date% </fc> \
+       \%trayerpad%\
+       \ "
        }
-
-

home/.config/xmobar/xmobarrc1

@@ -12,7 +12,8 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
        , hideOnStart = False
        , allDesktops = True
        , persistent = True
-       --, iconRoot = "."  -- default: "."
+       -- apparently there's no way to use env var or relpaths here
+       , iconRoot = "/home/itsdrike/.config/xmobar/xpm"
        , commands = [
                     -- Time and date
                       Run Date "<fn=2>\xf017</fn>  %b %d %Y - (%H:%M) " "date" 50
@@ -26,6 +27,9 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
                     , Run DiskU [("/", "<fn=2>\xf0c7</fn>  hdd: <free> free")] [] 60
                     -- Runs a standard shell command 'uname -r' to get kernel version
                     , Run Com "uname" ["-r"] "" 3600
+                    -- Add dynamic invisible XPM icon that resizes to accomodate trayer
+                    -- this needs to be an absolute string path, env vars or relpaths aren't accepted
+                    -- this should only be on 1 monitor (single file), so ignore this comment on others
                     -- Allow mouse clicking by using unsafe stdin reader
                     , Run UnsafeStdinReader
                     ]
@@ -37,7 +41,6 @@ Config { font    = "xft:Ubuntu:weight=bold:pixelsize=11:antialias=true:hinting=t
        \<fc=#666666>|</fc>   <fc=#ff6c6b> <action=`alacritty -e htop`>%memory%</action> </fc> \
        \<fc=#666666>|</fc>   <fc=#51afef> <action=`alacritty -e htop`>%disku%</action> </fc> \
        \<fc=#666666>|</fc>   <fc=#98be65> <action=`alacritty -e sudo iftop`>%wlp2s0%</action> </fc> \
-       \<fc=#666666>|</fc>   <fc=#46d9ff> %date% </fc>"
+       \<fc=#666666>|</fc>   <fc=#46d9ff> %date% </fc> \
+       \ "
        }
-
-