Pkg workflow - Application development

pkg-application.md

An application is "a project which provides standalone functionality not intended to be reused by other Julia projects", per the docs

shell> pwd
/Users/cbinz/Code

(v0.7) pkg> generate MyApp
Generating project MyApp:
    MyApp/Project.toml
    MyApp/src/MyApp.jl

shell> cd MyApp
/Users/cbinz/Code/MyApp

(v0.7) pkg> activate . # changes current project to MyApp

(MyApp) pkg> add Example # add some dependency to MyApp; puts Example in [deps] in Project.toml, and puts Example and its dependencies into Manifest.toml 
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://github.com/JuliaRegistries/General.git`
 Resolving package versions...
 Installed Example ─ v0.5.1
  Updating `Project.toml`
  [7876af07] + Example v0.5.1
  Updating `Manifest.toml`
  [7876af07] + Example v0.5.1
  [2a0f44e3] + Base64
  [8ba89e20] + Distributed
  [b77e0a4c] + InteractiveUtils
  [8f399da3] + Libdl
  [37e2e46d] + LinearAlgebra
  [56ddb016] + Logging
  [d6f4376e] + Markdown
  [9a3f8284] + Random
  [9e88b42a] + Serialization
  [6462fe0b] + Sockets
  [8dfed614] + Test

shell> cat Manifest.toml
[[Base64]]
uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"

[[Distributed]]
deps = ["LinearAlgebra", "Random", "Serialization", "Sockets"]
uuid = "8ba89e20-285c-5b6f-9357-94700520ee1b"

[[Example]]
deps = ["Test"]
git-tree-sha1 = "8eb7b4d4ca487caade9ba3e85932e28ce6d6e1f8"
uuid = "7876af07-990d-54b4-ab0e-23690620f79a"
version = "0.5.1"

[[InteractiveUtils]]
deps = ["LinearAlgebra", "Markdown"]
uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"

[[Libdl]]
uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"

[[LinearAlgebra]]
deps = ["Libdl"]
uuid = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

[[Logging]]
uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"

[[Markdown]]
deps = ["Base64"]
uuid = "d6f4376e-aef5-505a-96c1-9c027394607a"

[[Random]]
deps = ["Serialization"]
uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"

[[Serialization]]
uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"

[[Sockets]]
uuid = "6462fe0b-24de-5631-8697-dd941f90decc"

[[Test]]
deps = ["Distributed", "InteractiveUtils", "Logging", "Random"]
uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

shell> cat Project.toml
name = "MyApp"
uuid = "1c1d2e36-9cfe-11e8-1b52-ab36aa859629"
authors = ["Chris Binz <chris.binz@gmail.com>"]
version = "0.1.0"

[deps]
Example = "7876af07-990d-54b4-ab0e-23690620f79a"

Then the entire application can be recreated from the Manifest.toml and Project.toml

shell> rm -rf ~/.julia/packages/Example # get rid of Example

(MyApp) pkg> resolve # MyApp is still the current project
 Resolving package versions...
 Installed Example ─ v0.5.1
  Updating `Project.toml`
 [no changes]
  Updating `Manifest.toml`
 [no changes]

shell> ls ~/.julia/packages/
BinDeps  Compat  Conda	Crayons  Example  JSON	MacroTools  OhMyREPL  OrderedCollections  PyCall  Revise  SGP4	Tokenize  URIParser  VersionParsing