ERROR: cannot determine package name from URL or path - package

Question

I have a repo whose name is not a standard Julia module name, say git#github.com:ylxdzsw/oh-my-julia.jl.git.
I used to develop and use it via Pkg.clone("git#github.com:ylxdzsw/oh-my-julia.jl.git", "OhMyJulia") and it works well. However, it is deprecated and the equivalent way to clone a package in Julia 0.7 is using ] dev git#github.com:ylxdzsw/oh-my-julia.jl.git, but where should I specify the package name?
(v0.7) pkg> dev git#github.com:ylxdzsw/oh-my-julia.jl.git OhMyJulia
Updating registry at `~/.julia/registries/General`
Updating git-repo `https://github.com/JuliaRegistries/General.git`
Updating git-repo `git#github.com:ylxdzsw/oh-my-julia.jl.git`
ERROR: cannot determine package name from URL or path: git#github.com:ylxdzsw/oh-my-julia.jl.git
julia> using Pkg
julia> Pkg.develop(PackageSpec(url="git#github.com:ylxdzsw/oh-my-julia.jl.git", name="OhMyJulia"))
Updating git-repo `git#github.com:ylxdzsw/oh-my-julia.jl.git`
ERROR: cannot determine package name from URL or path: git#github.com:ylxdzsw/oh-my-julia.jl.git
Stacktrace:
[1] pkgerror(::String) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/Types.jl:120
[2] parse_package!(::Pkg.Types.Context, ::Pkg.Types.PackageSpec, ::String) at ./logging.jl:313
[3] (::getfield(Pkg.Types, Symbol("##25#28")){Pkg.Types.Context,Array{Pkg.Types.PackageSpec,1},String})(::LibGit2.CachedCredentials) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/Types.jl:567
[4] shred!(::getfield(Pkg.Types, Symbol("##25#28")){Pkg.Types.Context,Array{Pkg.Types.PackageSpec,1},String}, ::LibGit2.CachedCredentials) at ./secretbuffer.jl:184
[5] handle_repos_develop! at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/Types.jl:498 [inlined]
[6] #add_or_develop#13(::Symbol, ::Bool, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:52
[7] #add_or_develop at ./none:0 [inlined]
[8] #add_or_develop#12 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:29 [inlined]
[9] #add_or_develop at ./none:0 [inlined]
[10] #add_or_develop#10(::Base.Iterators.Pairs{Symbol,Any,Tuple{Symbol,Symbol},NamedTuple{(:mode, :shared),Tuple{Symbol,Bool}}}, ::Function, ::Pkg.Types.PackageSpec) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:27
[11] #add_or_develop at ./none:0 [inlined]
[12] #develop#19 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:70 [inlined]
[13] develop(::Pkg.Types.PackageSpec) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Pkg/src/API.jl:70
[14] top-level scope at none:0

Answer 1

It seems that the name is discarded if you already provide a url. Julia tries to parse your project's URL to extract the name. However, you used dash (-) in what should be the Package name. This eventually gives an error because types in julia cannot have dash in between characters since it is an operator.
You can specify the name of the package by creating a project file (i.e. Project.toml) for your package's root directory with correct name entry.
Another simple solution is to change the repository's name to OhMyJulia without the dashes so the name can be determined from the URL provided. But you should add Project.toml file it is the correct way to specify package properties (otherwise you cannot use your project within another project that contains a project file)
See: https://docs.julialang.org/en/v1/stdlib/Pkg/