fix(init): Support dots in final path item (#1425)

## Proposed Changes

Resolve any dots in paths when determining the environment name so that
`init -d` works when the final path item is a single or double dot.

We can't use `canonicalize` because it will return an error if the path
doesn't exits which breaks our existing behaviour for init against a
directory that doesn't yet exist:

-
https://doc.rust-lang.org/std/path/struct.Path.html#method.canonicalize

The following implementations all don't resolve a single `.` to a name:

- https://doc.rust-lang.org/std/path/fn.absolute.html
- https://docs.rs/path-absolutize/latest/path_absolutize/
- https://docs.rs/path-clean/latest/path_clean/
-
https://github.com/rust-lang/cargo/blob/0.79.0/crates/cargo-util/src/paths.rs#L76-L109

So the `path-dedot` crate seemed like the most appropriate choice.

I considered adding unit tests for this behaviour but the integration
tests are actually very fast for this functionality, make it simpler to
test changing current working directory in the context of running the
CLI, and give us some reassurance that we haven't affected the
downstream behaviour of creating an environment.

Output of the new tests before the implementation was added:

✗ c2.1: `flox init` with `--dir .` will create an environment in current
working directory. [37]
       tags: init
(from function `assert_success' in file
/nix/store/dhghqmkjk7fqpdbz71clvbh5zxp6p3lf-bats-with-libraries-1.10.0/share/bats/bats-assert/src/assert_success.bash,
line 42,
        in test file init.bats, line 115)
         `assert_success' failed
       ❌ ERROR: Can't init in root

       -- command failed --
       status : 1
       output : ❌ ERROR: Can't init in root
       --

       Last output:
       ❌ ERROR: Can't init in root
✗ c2.1: `flox init` with `--dir ..` will create an environment in parent
working directory. [39]
       tags: init
(from function `assert_success' in file
/nix/store/dhghqmkjk7fqpdbz71clvbh5zxp6p3lf-bats-with-libraries-1.10.0/share/bats/bats-assert/src/assert_success.bash,
line 42,
        in test file init.bats, line 125)
         `assert_success' failed

/var/folders/8q/spckhr654cv4xrcv0fxsrlvc0000gn/T/nix-shell.VLMq5i/bats-run-ZpmkUP/test/9/test/other
/var/folders/8q/spckhr654cv4xrcv0fxsrlvc0000gn/T/nix-shell.VLMq5i/bats-run-ZpmkUP/test/9/test
/var/folders/8q/spckhr654cv4xrcv0fxsrlvc0000gn/T/nix-shell.VLMq5i/flox-cli-tests-2WdbV0
       ❌ ERROR: Can't init in root

       -- command failed --
       status : 1
       output : ❌ ERROR: Can't init in root
       --

       Last output:
       ❌ ERROR: Can't init in root

## Release Notes

Support `flox init -d` where the final part of the path is a `.` or
`..`.

cli/flox/Cargo.toml

@@ -49,6 +49,7 @@ tracing.workspace = true
 url.workspace = true
 uuid.workspace = true
 xdg.workspace = true
+path-dedot = "3.1.1"
 
 [dev-dependencies]
 pretty_assertions.workspace = true

cli/flox/src/commands/init/mod.rs

@@ -24,6 +24,7 @@ use flox_rust_sdk::models::pkgdb::scrape_input;
 use flox_rust_sdk::models::search::{do_search, PathOrJson, Query, SearchParams, SearchResult};
 use indoc::formatdoc;
 use log::debug;
+use path_dedot::ParseDot;
 use toml_edit::{DocumentMut, Formatted, Item, Table, Value};
 use tracing::instrument;
 
@@ -79,6 +80,7 @@ impl Init {
             EnvironmentName::from_str(DEFAULT_NAME)?
         } else {
             let name = dir
+                .parse_dot()?
                 .file_name()
                 .map(|n| n.to_string_lossy().to_string())
                 .context("Can't init in root")?;

cli/tests/init.bats

@@ -110,6 +110,28 @@ function check_with_dir() {
   assert_output ".flox"
 }
 
+@test "c2.1: \`flox init\` with \`--dir .\` will create an environment in current working directory." {
+  run "$FLOX_BIN" init -d .
+  assert_success
+  run ls -A
+  assert_output ".flox"
+}
+
+@test "c2.1: \`flox init\` with \`--dir ..\` will create an environment in parent working directory." {
+  mkdir -p "$PROJECT_DIR/other"
+
+  pushd other
+  run "$FLOX_BIN" init -d ..
+  assert_success
+  popd
+
+  run ls -A
+  assert_output - <<EOF
+.flox
+other
+EOF
+}
+
 @test "c2.1: \`flox init\` with \`--dir <path>\` will create an environment in \`<path>\`. (relative)" {
   mkdir -p "$PROJECT_DIR/other"
 
@@ -118,6 +140,14 @@ function check_with_dir() {
   check_with_dir
 }
 
+@test "c2.1: \`flox init\` with \`--dir <path>\` will not create an environment where \`<path>\` is a file" {
+  touch "$PROJECT_DIR/other"
+
+  run "$FLOX_BIN" init -d ./other
+  assert_failure
+  assert_line --partial "Could not prepare a '.flox' directory: Not a directory"
+}
+
 @test "c2.1: \`flox init\` with \`--dir <path>\` will create an environment in \`<path>\`. (absolute)" {
   mkdir -p "$PROJECT_DIR/other"