refactor internal modules (#149)

should
- close #85
 
## description
### before
```
pkgs/nu-git-manager/
|-- nu-git-manager
|   |-- completions
|   |   `-- nu-complete.nu
|   |-- error
|   |   `-- error.nu
|   |-- fs
|   |   |-- cache.nu
|   |   |-- dir.nu
|   |   |-- path.nu
|   |   `-- store.nu
|   |-- git
|   |   |-- repo.nu
|   |   `-- url.nu
|   `-- mod.nu
|-- nupm.nuon
`-- tests
    |-- gm.nu
    `-- mod.nu
```
```
pkgs/nu-git-manager-sugar/
|-- nu-git-manager-sugar
|   |-- completions
|   |   `-- nu-complete.nu
|   |-- extra.nu
|   |-- git
|   |   |-- lib
|   |   |   |-- lib.nu
|   |   |   |-- prompt.nu
|   |   |   `-- style.nu
|   |   |-- mod.nu
|   |   `-- prompt.nu
|   |-- github.nu
|   `-- mod.nu
|-- nupm.nuon
`-- tests
    |-- git.nu
    `-- mod.nu
```

### after
> **Important**
>  caveats:
> - `[1]`: has `use path.nu ...` instead of `use path`
> - `[2]`: has `use style.nu ...` instead of `use style`

```
pkgs/nu-git-manager/
|-- nu-git-manager
|   |-- completions.nu    # internal
|   |-- error.nu          # internal
|   |-- fs                # internal
|   |   |-- cache.nu   [1]
|   |   |-- dir.nu     [1]
|   |   |-- mod.nu
|   |   |-- path.nu
|   |   `-- store.nu   [1]
|   |-- git               # internal
|   |   |-- mod.nu
|   |   |-- repo.nu
|   |   `-- url.nu
|   `-- mod.nu
|-- nupm.nuon
`-- tests
    |-- gm.nu
    `-- mod.nu
```
```
pkgs/nu-git-manager-sugar/
|-- nu-git-manager-sugar
|   |-- completions.nu        # internal
|   |-- extra.nu              # public
|   |-- git                   # public
|   |   |-- lib               #     internal
|   |   |   |-- git.nu     [2]#         public
|   |   |   |-- mod.nu
|   |   |   |-- prompt.nu     #         public
|   |   |   `-- style.nu   [2]#         public
|   |   |-- mod.nu
|   |   `-- prompt.nu         #     public
|   |-- github.nu             # public
|   `-- mod.nu
|-- nupm.nuon
`-- tests
    |-- git.nu
    `-- mod.nu
```

## TODO
- [x] `nu-git-manager-sugar/git/lib` issue with `prompt.nu` in
77596ff

pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/lib.nu → pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/git.nu

@@ -1,4 +1,4 @@
-use ../../git/lib/style.nu [color]
+use style.nu [color]
 
 # give the revision of the repo you're in
 #
@@ -119,3 +119,4 @@ export def get-status [
         untracked: ($status | parse --regex '^\?\? (?<file>.*)' | get file),
     }
 }
+

pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/mod.nu

@@ -0,0 +1,3 @@
+export module git.nu
+export module prompt.nu
+export module style.nu

pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/prompt.nu

@@ -1,5 +1,5 @@
-use ../../git/lib/lib.nu [get-revision, git-action, get-status]
-use ../../git/lib/style.nu [color, simplify-path]
+use git [get-revision, git-action, get-status]
+use style.nu [color, simplify-path]
 
 # /!\ the PWD will be sanitized
 export def get-left-prompt [duration_threshold: duration]: nothing -> string {

pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/mod.nu

@@ -1,8 +1,9 @@
 use std log
 
-use ../git/lib/lib.nu [get-status]
+module lib/
+use lib git [get-status]
 
-use ../completions/nu-complete.nu [
+use completions [
     GIT_QUERY_TABLES, GIT_STRATEGIES, git-query-tables, get-remotes, get-branches, get-strategies
 ]
 

pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/prompt.nu

@@ -1,4 +1,4 @@
-use ../git/lib/prompt.nu [get-left-prompt]
+use lib prompt [get-left-prompt]
 
 const DEFAULT_PROMPT_INDICATORS = {
     plain: "> ",

pkgs/nu-git-manager-sugar/nu-git-manager-sugar/mod.nu

@@ -1,3 +1,4 @@
+module completions.nu
 export module extra.nu
-export module git
+export module git/
 export module github.nu

pkgs/nu-git-manager-sugar/tests/git.nu

@@ -11,7 +11,7 @@ use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/ git [
     "gm repo branch wipe"
     "gm repo compare"
 ]
-use ../../../pkgs/nu-git-manager/nu-git-manager/fs/path.nu ["path sanitize"]
+use ../../../pkgs/nu-git-manager/nu-git-manager/fs path ["path sanitize"]
 use ../../../tests/common/setup.nu [get-random-test-dir]
 
 def --env init-repo-and-cd-into []: nothing -> path {
@@ -354,13 +354,13 @@ export def branch-compare [] {
 }
 
 export module prompt {
-    use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/lib.nu [
+    use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib git [
         get-revision, git-action
     ]
-    use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/prompt.nu [
+    use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib prompt [
         get-left-prompt
     ]
-    use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib/style.nu [
+    use ../../../pkgs/nu-git-manager-sugar/nu-git-manager-sugar/git/lib style [
         simplify-path
     ]
 

pkgs/nu-git-manager/nu-git-manager/fs/cache.nu

@@ -1,5 +1,4 @@
 use path.nu "path sanitize"
-use ../git/repo.nu [is-grafted]
 
 # get the path to the cache of the local store of repos
 #

pkgs/nu-git-manager/nu-git-manager/fs/mod.nu

@@ -0,0 +1,4 @@
+export module cache.nu
+export module dir.nu
+export module path.nu
+export module store.nu

pkgs/nu-git-manager/nu-git-manager/git/mod.nu

@@ -0,0 +1,2 @@
+export module repo.nu
+export module url.nu

pkgs/nu-git-manager/nu-git-manager/git/repo.nu

@@ -1,4 +1,4 @@
-use ../error/error.nu [throw-error]
+use ../error.nu [throw-error]
 
 # tell if a local repository has been grafted
 #

pkgs/nu-git-manager/nu-git-manager/git/url.nu

@@ -1,4 +1,4 @@
-use ../fs/path.nu "path sanitize"
+use ../fs path "path sanitize"
 
 # parse the URL of a Git repo
 #

pkgs/nu-git-manager/nu-git-manager/mod.nu

@@ -1,17 +1,22 @@
 use std log
 
-use fs/store.nu [get-repo-store-path, list-repos-in-store]
-use fs/cache.nu [
+module completions.nu
+module error.nu
+module fs/
+module git/
+
+use fs store [get-repo-store-path, list-repos-in-store]
+use fs cache [
     get-repo-store-cache-path, check-cache-file, add-to-cache, remove-from-cache, open-cache,
     save-cache, clean-cache-dir
 ]
-use fs/dir.nu [clean-empty-directories-rec]
-use fs/path.nu ["path sanitize", "path remove-prefix"]
-use git/url.nu [parse-git-url, get-fetch-push-urls]
-use git/repo.nu [is-grafted, get-root-commit, list-remotes]
-use error/error.nu [throw-error, throw-warning]
+use fs dir [clean-empty-directories-rec]
+use fs path ["path sanitize", "path remove-prefix"]
+use git url [parse-git-url, get-fetch-push-urls]
+use git repo [is-grafted, get-root-commit, list-remotes]
+use error.nu [throw-error, throw-warning]
 
-use completions/nu-complete.nu
+use completions
 
 # manage your Git repositories with the main command of NGM
 #
@@ -84,8 +89,8 @@ export def "gm clone" [
     url: string # the URL to the repository to clone, supports HTTPS and SSH links, as well as references ending in `.git` or starting with `git@`
     --remote: string = "origin" # the name of the remote to setup
     --ssh # setup the remote to use the SSH protocol both to FETCH and to PUSH
-    --fetch: string@"nu-complete git-protocols" # setup the FETCH protocol explicitely, will overwrite `--ssh` for FETCH
-    --push: string@"nu-complete git-protocols" # setup the PUSH protocol explicitely, will overwrite `--ssh` for PUSH
+    --fetch: string@"completions git-protocols" # setup the FETCH protocol explicitely, will overwrite `--ssh` for FETCH
+    --push: string@"completions git-protocols" # setup the PUSH protocol explicitely, will overwrite `--ssh` for PUSH
     --bare # clone the repository as a "bare" project
     --depth: int # the depth at which to clone the repository
 ]: nothing -> nothing {

pkgs/nu-git-manager/tests/gm.nu

@@ -1,7 +1,7 @@
 use std assert
 
-use ../../../pkgs/nu-git-manager/nu-git-manager/fs/path.nu ["path sanitize"]
-use ../../../pkgs/nu-git-manager/nu-git-manager/git/repo.nu [list-remotes]
+use ../../../pkgs/nu-git-manager/nu-git-manager/fs path ["path sanitize"]
+use ../../../pkgs/nu-git-manager/nu-git-manager/git repo [list-remotes]
 use ../../../pkgs/nu-git-manager/nu-git-manager/ *
 
 use ../../../tests/common/setup.nu [get-random-test-dir]

pkgs/nu-git-manager/tests/mod.nu

@@ -1,22 +1,22 @@
 use std assert
 
-use ../../../pkgs/nu-git-manager/nu-git-manager/git/url.nu [
+use ../../../pkgs/nu-git-manager/nu-git-manager/git url [
     parse-git-url, get-fetch-push-urls
 ]
-use ../../../pkgs/nu-git-manager/nu-git-manager/git/repo.nu [
+use ../../../pkgs/nu-git-manager/nu-git-manager/git repo [
     is-grafted, get-root-commit, list-remotes
 ]
-use ../../../pkgs/nu-git-manager/nu-git-manager/fs/store.nu [
+use ../../../pkgs/nu-git-manager/nu-git-manager/fs store [
     get-repo-store-path, list-repos-in-store
 ]
-use ../../../pkgs/nu-git-manager/nu-git-manager/fs/cache.nu [
+use ../../../pkgs/nu-git-manager/nu-git-manager/fs cache [
     get-repo-store-cache-path, check-cache-file, add-to-cache, remove-from-cache, open-cache,
     save-cache, clean-cache-dir
 ]
-use ../../../pkgs/nu-git-manager/nu-git-manager/fs/path.nu [
+use ../../../pkgs/nu-git-manager/nu-git-manager/fs path [
     "path sanitize", "path remove-prefix", "path remove-trailing-path-sep"
 ]
-use ../../../pkgs/nu-git-manager/nu-git-manager/fs/dir.nu [clean-empty-directories-rec]
+use ../../../pkgs/nu-git-manager/nu-git-manager/fs dir [clean-empty-directories-rec]
 
 use ../../../tests/common/setup.nu [get-random-test-dir]
 

tests/common/setup.nu

@@ -1,4 +1,4 @@
-use ../../pkgs/nu-git-manager/nu-git-manager/fs/path.nu ["path sanitize"]
+use ../../pkgs/nu-git-manager/nu-git-manager/fs path ["path sanitize"]
 
 # return the path to a random test directory
 #