feat(completion): support termux-toast command

share/completions/termux-toast.fish

@@ -0,0 +1,29 @@
+set command termux-toast
+
+complete -c $command -f
+
+complete -c $command \
+    -s h \
+    -d 'Show [h]elp'
+
+complete -c $command \
+    -a '(__fish_termux_api__complete_colors)' \
+    -s b \
+    -d 'Specify the [b]ackground color of a message' \
+    -x
+
+complete -c $command \
+    -a '(__fish_termux_api__complete_colors)' \
+    -s c \
+    -d 'Specify the text [c]olor of a message' \
+    -x
+
+complete -c $command \
+    -a 'middle\tdefault top bottom' \
+    -s g \
+    -d 'Specify the position of a message' \
+    -x
+
+complete -c $command \
+    -s s \
+    -d 'Show a message for the [s]hort period of time'

share/functions/__fish_termux_api__complete_colors.fish

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+function __fish_termux_api__complete_colors
+    set_color --print-colors | string match --invert --regex '^(br.*|normal)$'
+end