.Xresources

! Xresourses is read by C preprocessor - variables are defined
#ifndef MON_DPI
    #define MON_DPI 96
#endif

#ifndef CURSOR_SIZE
    #define CURSOR_SIZE 24
#endif

#ifndef FONT_SIZE
    #define FONT_SIZE 20
#endif


! font settings --------------------------------------------------------------

Xft.autohint: true
Xft.antialias: true
Xft.hinting: true
Xft.hintstyle: hintfull
Xft.dpi: MON_DPI

Xft.rgba: rgb
Xft.lcdfilter: lcddefault

! Cursor size
Xcursor.size: CURSOR_SIZE

!*.cursorColor:  #add8e6
*.cursorColor: #16A085
!
*.font: monospace:size=14:antialias=true:autohint=true:hinting=true:hintstyle=hintfull:dpi=MON_DPI
!


!! ---------------------------
!    DWM
!! --------------------------
dwm.normbordercolor: #282828
dwm.normbgcolor: #1d2021
dwm.normfgcolor: #ebdbb2
dwm.selbordercolor: #cc241d
dwm.selbgcolor: #16A085
dwm.selfgcolor: #fbf1c7
!! ---------------------------
!    st - simple terminal
!! --------------------------
st.alpha: 0.92
st.borderpx: 15
st.fontalt0: DejaVu Sans Mono for Powerline:size=14:antialias=true:autohint=true:hinting=true:hintstyle=hintfull:dpi=MON_DPI
!------------------------------
!********** Colours ***********
!------------------------------
!------------------------------
!   gruvbox
!------------------------------
! transparancy - note normally is based on rgb 0-255 but in st has changed to fraction
*.alpha: 245

*.background: #1d2021
*.foreground: #fbf1c7

*.color0: #282828
*.color1: #cc241d
*.color2: #98971a
*.color3: #d79921
*.color4: #458588
*.color5: #b16286
*.color6: #689d6a
*.color7: #a89984
*.color8: #928374
*.color9: #fb4934
*.color10: #b8bb26
*.color11: #fabd2f
*.color12: #83a598
*.color13: #d3869b
*.color14: #8ec07c
*.color15: #ebdbb2

!------------------------------
! Rofi
!------------------------------
rofi.dpi: MON_DPI
rofi.font: monospace 16
rofi.padding: 20
rofi.line-padding: 2
rofi.color-enabled: true
rofi.hide-scrollbar: true
rofi.separator-style: solid
rofi.color-window: #1c2023, #919ba0, #1c2023
rofi.color-normal: #1c2023, #919ba0, #1c2023, #a4a4a4, #1c2023
rofi.color-urgent: argb:00000000, #f43753, argb:00000000, argb:00000000, #e29a49
rofi.color-active: argb:00000000, #49bbfb, argb:00000000, argb:00000000, #e29a49
rofi.kb-cancel: Escape,Alt+F1

! urxvt -------------------------------------------

! "monospace" is an alias defined in ~/.config/fontconfig/fonts.conf
URxvt.font: xft:monospace:size=10
URxvt.boldFont: xft:monospace:bold:size=10
! Add fallback fonts as laid out in `man 1 urxvt` under "font:" in the RESOURCES section

URxvt.letterSpace: -1
!URxvt.lineSpace: 1
! The letterSpace and lineSpace settings are highly dependent on the font(s) configured above
! and should be changed or removed as necessary.

! Window size and position
!URxvt*geometry: 60x22+50+100
! Window size, let the Window Manager position it
URxvt.geometry: 83x35

URxvt.scrollstyle: plain
URxvt.scrollBar: true
URxvt.scrollBar_right: true
URxvt.iconFile: /usr/share/icons/Paper/48x48/apps/utilities-terminal.png
URxvt.cursorBlink: true
URxvt.fading: 20

! Grey theming
!URxvt*background: #cecece
!URxvt*foreground: #101010
! Terminator Beam colours
URxvt.background: [90]#082B4A
URxvt.foreground: #ADD8E6

! scrollback buffer lines - 65535 is max (64 is default)
URxvt.saveLines: 16384

! True Transparency, opacity percentage set in square brackets before URxvt.background colour
URxvt.depth: 32

! Clickble URLs
URxvt.perl-ext-common: default,matcher
URxvt.url-launcher: /usr/bin/x-www-browser
URxvt.matcher.button: 3

! Custom colourscheme, see http://terminal.sexy/ for more ideas.
! Commented out colors are from the original Bunsenlabs Hydrogen terminal theme.

! Black
URxvt.color0: #5f5f5f
URxvt.color8: #828282

! Red
URxvt.color1: #d96468
URxvt.color9: #d98f93

! Green
URxvt.color2: #a2d964
URxvt.color10: #b8d98f

! Yellow
URxvt.color3: #d9c964
URxvt.color11: #d9cf8f

! Blue
URxvt.color4: #64a2d9
URxvt.color12: #8f99d9

! Magenta
URxvt.color5: #9a64d9
URxvt.color13: #b08fd9

!Cyan
URxvt.color6: #64d9d5
URxvt.color14: #8fd9d5

! White
URxvt.color7: #989898
URxvt.color15: #c5c5c5
!------------------------------
!  Bunsenlabs - Helium
!------------------------------
!*.background: #082b4a
!*.foreground: #add8e6
!!
!! Black
!*.color0: #5f5f5f
!*.color8: #828282
!
!! Red
!*.color1: #d96468
!*.color9: #d98f93
!
!! Green
!*.color2: #a2d964
!*.color10: #b8d98f
!
!! Yellow
!*.color3: #d9c964
!*.color11: #d9cf8f
!
!! Blue
!*.color4: #64a2d9
!*.color12: #8f99d9
!
!! Magenta
!*.color5: #9a64d9
!*.color13: #b08fd9
!
!!Cyan
!*.color6: #64d9d5
!*.color14: #8fd9d5
!
!! White
!*.color7: #989898
!*.color15: #c5c5c5

!------------------------------
!  Manjaro - st
!------------------------------
!*.background: #292f34
!*.foreground: #d8d8d8
!
!*.color0: #292f34
!*.color1: #ab4642
!*.color2: #99cc99
!*.color3: #f7ca88
!*.color4: #7cafc2
!*.color5: #ba8baf
!*.color6: #1ABB9B
!*.color7: #d8d8d8
!*.color8: #585858 
!*.color9: #ab4642
!*.color10: #99cc99
!*.color11: #f7ca88
!*.color12: #7cafc2
!*.color13: #ba8baf
!*.color14: #1ABB9B
!*.color15: #f8f8f8
!
! -----------------------------
! ORIGINAL
! -----------------------------
!
!! Black
!! URxvt.color0: #000000
!! URxvt.color8: #555753
!URxvt.color0: #5f5f5f
!URxvt.color8: #828282
!!URxvt.color0: #555753
!!URxvt.color8: #babdb6
!
!! Red
!! URxvt.color1: #cc0000
!! URxvt.color9: #ef2929
!URxvt.color1: #b44444
!URxvt.color9: #d98f93
!
!! Green
!! URxvt.color2: #4e9a06
!! URxvt.color10: #8ae234
!URxvt.color2: #5ecb8c
!URxvt.color10: #13b9b9
!
!! Yellow
!! URxvt.color3: #c4a000
!! URxvt.color11: #fce94f
!URxvt.color3: #d9c964
!URxvt.color11: #d9cf8f
!
!! Blue
!! URxvt.color4: #3465a4
!! URxvt.color12: #729fcf
!URxvt.color4: #3d6aac
!URxvt.color12: #8f99d9
!
!! Magenta
!! URxvt.color5: #75507b
!! URxvt.color13: #ad7fa8
!URxvt.color5: #9a64d9
!URxvt.color13: #b08fd9
!
!!Cyan
!! URxvt.color6: #06989a
!! URxvt.color14: #34e2e2
!URxvt.color6: #64d9d5
!URxvt.color14: #8fd9d5
!
!! White
!! URxvt.color7: #d3d7cf
!! URxvt.color15: #eeeeec
!URxvt.color7: #d3d7cf
!URxvt.color15: #c5c5c5
! -----------------------------
!
! Colourised man pages, also changes scheme for htop(1) and others.
!
! Headings:
! URxvt.colorBD: #cf6171
!
! Underline:
! URxvt.colorUL: #4186be
!
! Italicised:
! URxvt.colorIT: #71bebe

merge_Xresources.sh

#!/bin/bash
if [ ! -z "$DPI" ] && [ ! -z "$CURSOR_SIZE" ] && [ ! -z "$FONT_SIZE" ]; then
        xrdb -DMON_DPI="$DPI" -DCURSOR_SIZE="$CURSOR_SIZE" -DFONT_SIZE="$FONT_SIZE" -merge $HOME/.Xresources
        xrandr --dpi "$DPI"
else
        xrdb -merge $HOME/.Xresources
        xrandr --dpi 96
fi

define env variables DPI, CURSOR_SIZE, FONT_SIZE in .profile or some other early read file