* add basic git repository tree api (#5934)
This PR adds the tree api endpoint to gogs api:
`GET/repos/:owner/:repo/git/trees/:tree_sha`
This new api endpoint that is being added is in conformance to
the GitHub REST API v3 specification. Documentation can be found
here: developer.github.com/v3/git/trees/#get-a-tree
For a given user, repo and sha value, this api (currently) returns
a single tree using the SHA1 value for that tree.
- Recursive implementation is yet to be implemented.
- Creating a Tree using POST is yet to be implemented.
Example curl:
```
l curl -H "Authorization: token REDACTED" c59441ded1 -X GET | jq .
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 940 100 940 0 0 12034 0 --:--:-- --:--:-- --:--:-- 12051
[
{
"sha": "c59441ded1549b149def0d4c54594d31a7f3718f",
"tree": [
{
"mode": "120000",
"path": "/home/bharatnc/gogs-repositories/root/testrepo.git",
"sha": "472ac2361b65136b393d652de25341e2ea44f299",
"size": 1077,
"type": "blob",
"url": "472ac2361b"
},
{
"mode": "120000",
"path": "/home/bharatnc/gogs-repositories/root/testrepo.git",
"sha": "70fcb456d436f08462602f26df6fb7e167e7a916",
"size": 12,
"type": "blob",
"url": "70fcb456d4"
},
{
"mode": "120000",
"path": "/home/bharatnc/gogs-repositories/root/testrepo.git",
"sha": "092c58d4b63df5779a4d020b1fdbb762421bbb4f",
"size": 380,
"type": "blob",
"url": "092c58d4b6"
}
],
"url": "c59441ded1"
}
]
```
* remove vertical space
* make go.mod to be same as in master
* rename structs to sound better
* simplify expressions and fix error msg
* Update tree.go
* Update tree.go
* display file name instead of repo path
* Update tree.go
Co-authored-by: ᴜɴᴋɴᴡᴏɴ <u@gogs.io>
Bharat Nallan
Unknwon