Add basic dimswitch

Prints out current version number and simple usage instructions on invocation
with -h, --help, -v, --version. Displays used configuration file when invoked
with -i/--info.

Adds simple toggle ability script, used by simply invoking `dimswitch` from the
.local/bin/ directory. In this dotfile configuration that directory is added to
the path, so can be invoked from anywhere.

Invoked without any options it will look for a line which specifies a theme
with a `-light` or `-dark` option appended, and switch them out. Does not
change the vim colorscheme or background, and can not change the theme in
alacritty itself.

The extent of this script is still limited, if it should be expanded python
seems more suited. For further discussion, see its original Merge Request !18.

.local/bin/test/dimswitch.bats

@@ -0,0 +1,63 @@
+setup() {
+  fut="$BATS_TEST_DIRNAME/../dimswitch"
+}
+
+@test "[-v flag] Displays version information" {
+  run $fut -v
+  [ "$status" -eq 0 ]
+  match='^.* [0-9]\.[0-9]\.[0-9]$'
+  echo $output
+  if echo "$output" | grep "$match";then true;else false; fi
+}
+
+@test "[--version flag] Displays version information" {
+  run $fut --version
+  [ "$status" -eq 0 ]
+  match='^.* [0-9]\.[0-9]\.[0-9]$'
+  echo $output
+  if echo "$output" | grep "$match";then true;else false; fi
+}
+
+@test "[-h flag] Displays usage information" {
+  run $fut -h
+  [ "$status" -eq 0 ]
+  match='^.*Usage:.*$'
+  echo $output
+  if echo "$output" | grep "$match";then true;else false; fi
+}
+
+@test "[--help flag] Displays usage information" {
+  run $fut --help
+  [ "$status" -eq 0 ]
+  match='^.*Usage:.*$'
+  echo $output
+  if echo "$output" | grep "$match";then true;else false; fi
+}
+
+#### _findfile
+
+@test "[-i flag] Displays config file for alacritty" {
+  export DIM_PROGRAMS="alacritty"
+  export DIM_ALACRITTY_CONF="$BATS_TEST_DIRNAME/files/alacritty_conf.yml"
+
+  run $fut -i
+  [ "$status" -eq 0 ]
+  match="^alacritty - $DIM_ALACRITTY_CONF"
+
+  echo $output
+
+  if echo "$output" | grep "$match";then true;else false;fi
+}
+
+@test "[-i flag] Displays error if no config file found" {
+  export DIM_PROGRAMS="alacritty"
+  export DIM_ALACRITTY_CONF="$BATS_TEST_DIRNAME/files/nonexisting_alacritty_conf.yml"
+
+  run $fut -i
+  [ "$status" -eq 0 ]
+  match="^alacritty - No associated configuration file found."
+
+  echo $output
+
+  if echo "$output" | grep "$match";then true;else false;fi
+}