Specify alias file as a command line argument

* Add a dependency on 'getopts'
* Remove the hard-coded "testaliases" file used previously.
* write_alias: Update to include a `file` attribute that can reference
  an arbitrary file
* find_alias_in_file: Change the `file` parameter to be a Path reference
  instead of a string so that it can be called correctly from
  `write_alias`. Also because it matches the File module's signature.

Originally I planned to make the file argument available under a `-f`
command-line option. Later I decided instead to make it a required
argument, so it made more sense not to prefix it with an option flag.
Since I no longer need command line options—just the first argument—I
realised that I could get rid of the `getopts` dependency and use
`std::env::args`. Will do this in a later commit.

1 files changed, 8 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 81030eb..8db7560 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,4 +1,12 @@
 [root]
 name = "alias-auto-add"
 version = "0.0.1"
+dependencies = [
+ "getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "getopts"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"