Skip to content
Go to file

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time


Build Status

the introspective jgit wrapper

 No one who does good work will ever come to a
 bad end, either here or in the world to come.
  - Krishna, Bhagavad Gita


gita is a wrapper around the popular jgit project. An alternative library is clj-jgit and it does have alot more higher-level functions at the moment. However, due to the enormous amount of functionality around git, it is very difficult to manually write a wrapper around the entire suite. So The novelty of gita is that it uses reflection provided by hara.reflect to generate the wrapper interface in such a way that the entire functionality of the main org.eclipse.jgit.api.Git class is accessible and usable in a clojure compatible convention.

The aims of this project are:

  • to have a git library for clojure that is simple and intuitive to use
  • to use less than 1000 lines of code
  • to use reflection, allowing for:
    • self-directed exploration of the library
    • auto-generation of the clojure interface
    • auto-coercion of string-like inputs (ids and files)
    • auto-conversion of outputs to simple clojure data
  • to learn more about git in the process


Add to project.clj dependencies:

[im.chit/gita "0.2.5"]


There is only one function: git. It's usage is very much like how the command-line version is used:

(use 'gita.core)

;; This should feel somewhat familiar:

;  Subtasks for git are:
;  [:add :apply :archive :blame :branch :checkout 
;   :cherry :clean :clone :commit :describe :diff 
;   :fetch :gc :init :log :ls :merge :name :notes 
;   :pull :push :rebase :reflog :remote :reset :revert :rm 
;   :stash :status :submodule :tag]

absolute basics - :init, :status, :cd and :pwd

;; So we can now initialise a directory
(git :init :directory "/tmp/gita-example")
=> "/tmp/gita-example/.git"

;; Lets check the status of our new repository
(git "/tmp/gita-example" :status)
=> {:clean? true, :uncommitted-changes! false}

;; Now the default directory is set and we don't
;; need to set it next time we call:
(git :status)
=> {:clean? true, :uncommitted-changes! false}

;; We can also use `:cd` to set the default directory
(git :cd "/tmp/gita-example")
(git :status)
=> {:clean? true, :uncommitted-changes! false}

;; To check the current working directory, use `:pwd`
(git :pwd)
=> "/tmp/gita-example"

;; We add a file and then check for the repository status 
(spit "/tmp/gita-example/hello.txt" "hello there")
(git :status)
=> {:clean? false, :uncommitted-changes! false, :untracked #{"hello.txt"}}

exploration and self-help - :? and :help

We can get help with a subcommand at anytime by using :? or :help after the first keyword. This will return a map with keys and the type of argument that it takes:

;; Lets take a look at the `:init` subcommand:
(git :init :?) ;; using `:help` does the same thing
=> {:git-dir java.lang.String, 
    :directory java.lang.String, 
    :bare boolean}  

So we can use it in the following way to create a bare git repository:

(git :init :directory "/tmp/new-bare-repo" :bare true)
=> "/tmp/new-bare-repo"

Lets take a look at the :status subcommand:

(git :status :?)
=> {:working-tree-it   org.eclipse.jgit.treewalk.WorkingTreeIterator, 
    :progress-monitor  org.eclipse.jgit.lib.ProgressMonitor, 
    :ignore-submodules #{"NONE" "UNTRACKED" "DIRTY" "ALL"}, 
    :path              [java.lang.String]}

We can decode the representation of the options

  • for :working-tree-it an input of type org.eclipse.jgit.treewalk.WorkingTreeIterator is needed
  • for :progress-monitor an input of type org.eclipse.jgit.lib.ProgressMonitor is needed
  • for :ignore-submodules an input of the following options #{"NONE" "UNTRACKED" "DIRTY" "ALL"} is needed
  • for :path a string input or a vector of strings is needed

working locally - :add, :commit, :log and :rm

So we continue to add on our basic vocabulary for our git workflow. Using help, we can have a look at what options :add and :commit take:

(git :add :?)
=> {:working-tree-iterator org.eclipse.jgit.treewalk.WorkingTreeIterator,
    :update boolean,
    :filepattern [java.lang.String]}

(git :commit :?)
=> {:reflog-comment java.lang.String,
    :only java.lang.String,
    :message java.lang.String,
    :insert-change-id boolean,
    :committer java.lang.String,
    :author java.lang.String,
    :amend boolean,
    :all boolean}

Lets do an example, with the /tmp/gita-example repository, lets

(git :init :directory "/tmp/gita-example")
(git :cd "/tmp/gita-example")

We start off by creating three files and then commiting just the first

(do (spit "/tmp/gita-example/hello.txt" "hello")
    (spit "/tmp/gita-example/world.txt" "world")
    (spit "/tmp/gita-example/again.txt" "again"))

(git :add :filepattern ["hello.txt"])
=> {"hello.txt" #{:merged}}

(git :commit :message "Added Hello.txt")
=> {:commit-time 1425683330,
    :name "9f1177ad928d7dea2afedd58b1fb7192b3523a6c",
    :author-ident {:email-address "",
                   :name "Chris Zheng",
                   :time-zone-offset 330,
                   :when #inst "2015-03-06T23:08:50.000-00:00"},
    :full-message "Added Hello.txt"}

Feel free to use your shell to browse to /tmp/gita-example and run git status. Now we can check what we have committed using :log:

(git :log)
=> [{:commit-time 1425683330,
    :name "9f1177ad928d7dea2afedd58b1fb7192b3523a6c",
    :author-ident {:email-address "",
                   :name "Chris Zheng",
                   :time-zone-offset 330,
                   :when #inst "2015-03-06T23:08:50.000-00:00"},
     :full-message "Added Hello.txt"}]

Oops.. I made an error in the status message. The file should be in lowercase. We can fix that:

(git :commit :message "Added `hello.txt`" :amend true)
=> {:commit-time 1425683376,
    :name "f21fe52cdc3511918b7d52e43f909dbe3c380159",
    :author-ident {:email-address "",
                   :name "Chris Zheng",
                   :time-zone-offset 330,
                   :when #inst "2015-03-06T23:08:50.000-00:00"},
    :full-message "Added `hello.txt`"}

Now lets add all the files and commit, and check that we indeed have two commits:

(git :add :filepattern ["."])
=> {"again.txt" #{:merged},
    "hello.txt" #{:merged},
    "world.txt" #{:merged}}

(git :commit :message "Added `world.txt` and `again.txt`")
=> {:commit-time 1425683590,
    :name "2aad32d04470f118c1c891e163290433d70bbd21",
    :author-ident {:email-address "",
                   :name "Chris Zheng",
                   :time-zone-offset 330,
                   :when #inst "2015-03-06T23:13:10.000-00:00"},
    :full-message "Added `world.txt` and `again.txt`"}

(mapv :name (git :log))
=> ["2aad32d04470f118c1c891e163290433d70bbd21"

We can test out :rm for removing files. Feel free to run (git :rm :?) to see the inputs:

(git :rm :filepattern ["hello.txt" "world.txt"])
=> {"again.txt" #{:merged}}

(git :commit :message "Leave `again.txt` as the only file")
(mapv :name (git :log))
=> ["9fb08f2b6d10ae1ec8cf15eb81ac56edd504160f"

;; Checking the status, it is clean
(git :status)
=> {:clean? true, :uncommitted-changes! false}

raw-objects - :&

When :& is used in the parameter, the raw result of the commant call is returned instead of being converted into a corresponding map/string. This is demonstrated in the example below:

(type (git :init :directory "/tmp/git-example" :&))
=> org.eclipse.jgit.api.Git

(def status-obj (git :status :&))
(type status-obj)
=> org.eclipse.jgit.api.Status

;; Instead of the ugly <org.eclipse.jgit.api.Status@234234> notation, the 
;; object is prettied up for printing
(println status-obj)
=> #status::{:clean? true, :uncommitted-changes! false} 

(require '[hara.reflect :as reflect])
(reflect/query-class status-obj [:name])
=> ("clean" "diff" "getAdded" "getChanged" "getConflicting" 
    "getConflictingStageState" "getIgnoredNotInIndex" "getMissing" 
    "getModified" "getRemoved" "getUncommittedChanges" "getUntracked" 
    "getUntrackedFolders" "hasUncommittedChanges" "isClean" "new")

working locally - :branch, :checkout and :merge

Lets look at branching, running (git :branch) lists the are 4 subcommands:

(git :branch)
=> #{:create :delete :rename :list}

Using :list the current branches that are avaliable:

(git :branch :list)
=> [{:object-id "9fb08f2b6d10ae1ec8cf15eb81ac56edd504160f"
     :name "refs/heads/master"
     :peeled-object-id nil
     :storage "LOOSE"
     :peeled? false :symbolic? false
     :snap-shot {:last-modified 1425683834000
                 :last-read 1425701350639
                 :cannot-be-racily-clean true}}]

The options that come with the :branch :create subcommand are:

(git :branch :create :?)
=> {:upstream-mode #{"SET_UPSTREAM" "NOTRACK" "TRACK"}
    :start-point java.lang.String
    :name java.lang.String
    :force boolean}

We can create a new branch, we name this "tito"

(git :branch :create :name "tito")
=> {:object-id "9fb08f2b6d10ae1ec8cf15eb81ac56edd504160f"
    :name "refs/heads/tito"
    :peeled-object-id nil
    :storage "LOOSE"
    :peeled? false :symbolic? false
    :snap-shot {:last-modified 1425701503000
                :last-read 1425701503780
                :cannot-be-racily-clean false}}

We take a list of the git branches and then checkout a new branch named tito

(map :name (git :branch :list))
=> ("refs/heads/master" "refs/heads/tito")

(:name (git :checkout :name "tito"))
=> "refs/heads/tito"

We change two files and look at the :diff

(spit "/tmp/gita-example/again.txt" "bonjour")
(spit "/tmp/gita-example/world.txt" "world")
(git :diff)
=> [{:change-type "MODIFY",
     :score 0,
     :old-path "again.txt",
     :new-mode "100644",
     :tree-filter-marks 0,
     :new-path "again.txt",
     :old-id "d3dc34affe77fdb18e4beef9d9b3213d791358e5",
     :old-mode "100644",
     :new-id "80bc9f6d40eef64fbaa976981b6b2916f71c1558"}
    {:change-type "ADD",
     :score 0,
     :old-path "/dev/null",
     :new-mode "100644",
     :tree-filter-marks 0,
     :new-path "world.txt",
     :old-id "0000000000000000000000000000000000000000",
     :old-mode "0",
     :new-id "04fea06420ca60892f73becee3614f6d023a4b7f"}]

We can now commit our changes and merge the changes into master

(do (git :add :filepattern ["."])
    (git :commit :message "Changed to french"))
=> {:commit-time 1425702855,
    :name "964555215c54203747d118a45bf2595bf01257d1" ;; Take a note of this ID
    :full-message "Changed to french"}

;; I haven't figured out how to just write something like `(git :merge "tito")` but we 
;; can use the id of the commit to do it:
(git :checkout :name "master")
(git :merge :include "964555215c54203747d118a45bf2595bf01257d1")
=> {:base {:commit-time 1425702855
           :name "9fb08f2b6d10ae1ec8cf15eb81ac56edd504160f"}
    :checkout-conflicts nil :conflicts nil
    :failing-paths nil :merge-status "Already-up-to-date"
    :merged-commits [....]
    :new-head {:commit-time 1425702855
               :name "964555215c54203747d118a45bf2595bf01257d1"
               :full-message "Changed to french"}}

PHEW. Lets keep going

working remotely - :pull, :push

I'm going to cheat and just use this on the gita repo, for effects only:

(git :cd) ;; Goes to my default dir (the gita directory)

(git :pull) 
=> {:fetched-from "origin",
    :fetch-result {:advertised-refs [...], :messages "", :tracking-ref-updates [],
                  :uri ""}
    :merge-result {:base {...},
                  :checkout-conflicts nil, :conflicts nil, :failing-paths nil,
                  :merge-status "Already-up-to-date",
                  :merged-commits [...],
                  :new-head {...}},
    :rebase-result nil,
    :successful? true}

(git :push)
=> [{:advertised-refs [{:name "refs/heads/master",
                          :object-id "bf4d5affc89922117fba057457930e23e37439a3",
                          :peeled-object-id nil,
                          :storage "NETWORK", :peeled? true, :symbolic? false}],
       :messages "",
       :remote-updates [{:src-ref "refs/heads/master",
                         :expected-old-object-id nil,
                         :remote-name "refs/heads/master",
                         :status "UP_TO_DATE",
                         :expecting-old-object-id? false,
                         :new-object-id "bf4d5affc89922117fba057457930e23e37439a3",
                         :delete? false, :force-update? false,
                         :fast-forward? false, :message nil}],
       :tracking-ref-updates [{:local-name "refs/heads/master",
                               :new-object-id "bf4d5affc89922117fba057457930e23e37439a3",
                               :old-object-id "bf4d5affc89922117fba057457930e23e37439a3",
                               :remote-name "refs/heads/master",
                               :result "NO_CHANGE"}],
       :uri ""}]

alot more - please help!

I'm a git newbie compared to most and so I don't really know how to use a lot of commands properly or how they behave in the context of jgit. Some commands that can do with some TLC/use cases/pull requests are:

:apply, :stash, :archive, :rebase, :notes, :cherry, 
:blame, :revert, :tag, :clean, :ls, :submodule

So please have a play!


Copyright © 2015 Chris Zheng

Distributed under the MIT License


moved -> 'lucid.git'



No releases published


No packages published
You can’t perform that action at this time.