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Here we share some examples for better use of MicroEmacs.

font size changes made easy

Many editors offer the possibility to increase or decrease the fontsize of your text editor by using Ctrl-Plus or Ctrl-Minus.

Let's implement this using the MicroEmacs macro language:

First we need a list of fonts through which we cycle, usually ordered by size. I create my one as described in this Gist.

set-variable %fonts-ubuntu "|-freetype-ubuntu mono-medium-r-normal--14-100-100-100-p-61-iso10646-1|"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 1 "-freetype-ubuntu mono-medium-r-normal--17-120-100-100-p-74-iso10646-1"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 2 "-freetype-ubuntu mono-medium-r-normal--19-140-100-100-p-82-iso10646-1"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 3 "-freetype-ubuntu mono-medium-r-normal--22-160-100-100-p-94-iso10646-1"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 4 "-freetype-ubuntu mono-medium-r-normal--25-180-100-100-p-107-iso10646-1"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 5 "-freetype-ubuntu mono-medium-r-normal--28-200-100-100-p-119-iso10646-1"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 6 "-freetype-ubuntu mono-medium-r-normal--30-220-100-100-p-131-iso10646-1"
set-variable %fonts-ubuntu &linsert %fonts-ubuntu 7 "-freetype-ubuntu mono-medium-r-normal--33-240-100-100-p-140-iso10646-1"
; the current index
set-variable %font-index 2

Now we need two functions which are bind to Control-Plus and Control-Minus to increment or decrement the current font index and pick the font to configure MicroEmacs.

define-macro font-inc
    !if &equal %font-index 7
        500 ml-write "Largest font!"
    !else
        set-variable %font-index &inc %font-index 1
        set-variable #l1 &lget %fonts-ubuntu %font-index
        change-font #l1
    !endif
    
!emacro

define-macro font-dec
    !if &equal %font-index 1
        500 ml-write "Smallest font!"
    !else
        set-variable %font-index &dec %font-index 1
        set-variable #l1 &lget %fonts-ubuntu %font-index
        change-font #l1
    !endif
!emacro

global-bind-key "font-inc" "C-+"
global-bind-key "font-dec" "C--"
; just to set the first font
font-inc

Voila, now we can cycle through different font sizes by pressing Ctrl-Plus and Ctrl-Minus.