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There are several problems leading to the unintentional globbing issue:
Firstly, within `rcup` and `rcdn`, when constructing arguments to pass
to `lsrc`, the _for_ loops over the arguments do not have quoted
variables, leading to globbing. I have quoted these accordingly.
Secondly, `lsrc` is invoked as follows:
```sh
dests_and_srcs="$(lsrc $LS_ARGS)"
```
When shells use command substitution like this, they go through two stages:
- Word expansion. This is useful because it splits `LS_ARGS` back up
into its constituent strings.
- File name expansion. The side effect of this is to introduce globbing.
You can read more about how this works [here](https://www.tldp.org/LDP/Bash-Beginners-Guide/html/sect_03_04.html#sect_03_04_07).
To fix this, I have passed `lsrc` and its arguments to `eval`. This
involves quoting the relevant arguments, so:
```sh
for dotfiles_dir in "$DOTFILES_DIRS"; do
LS_ARGS="$LS_ARGS -d $dotfiles_dir"
done
```
becomes
```sh
for dotfiles_dir in "$DOTFILES_DIRS"; do
LS_ARGS="$LS_ARGS -d \"$dotfiles_dir\""
done
```
Then `lsrc` is invoked as follows:
```sh
dests_and_srcs="$(eval "lsrc $LS_ARGS")"
```
There is one final non-globbing issue: the parsing of arguments can
introduce extra spaces in the variables, which then trip up the
`dotfiles_dir_excludes` function. For example:
```sh
I) includes="$includes $OPTARG";;
```
introduces a space if `includes` is empty or null.
I have introduced the function `append_variable`, which allows two
variables to be appended without introducing unnecessary whitespace.
Then the additional whitespace is never added in the first place.
Fixes #256.
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Edd Salkield