Drop 0.7 tests and add the deprecated file.

.appveyor.yml

@@ -1,6 +1,5 @@
 environment:
   matrix:
-  - julia_version: 0.7
   - julia_version: 1.0
   - julia_version: nightly
 

.travis.yml

@@ -4,7 +4,6 @@ os:
   - linux
   - osx
 julia:
-  - 0.7
   - 1.0
   - nightly
 notifications:

src/deprecated.jl

@@ -0,0 +1,158 @@
+###############################################################################
+# Deprecations for calling impute on an Imputor with a custom AbstractContext #
+###############################################################################
+Base.@deprecate(
+    impute(imp::Imputor, context::AbstractContext, data; kwargs...),
+    impute(typeof(imp)(; context=context), data; kwargs...)
+)
+
+Base.@deprecate(
+    impute!(imp::Imputor, context::AbstractContext, data; kwargs...),
+    impute!(typeof(imp)(; context=context), data; kwargs...)
+)
+#####################################################################
+# Deprecate all impute calls where the first argument is an Imputor #
+#####################################################################
+"""
+    impute!(data, method::Symbol=:interp, args...; limit::Float64=0.1)
+
+Looks up the `Imputor` type for the `method`, creates it and calls
+`impute!(imputor::Imputor, data, limit::Float64)` with it.
+
+# Arguments
+* `data`: the datset containing missing elements we should impute.
+* `method::Symbol`: the imputation method to use
+    (options: [`:drop`, `:fill`, `:interp`, `:locf`, `:nocb`])
+* `args::Any...`: any arguments you should pass to the `Imputor` constructor.
+* `limit::Float64`: missing data ratio limit/threshold (default: 0.1)
+"""
+function impute!(data, method::Symbol, args...; limit::Float64=0.1)
+    Base.depwarn(
+        """
+        impute!(data, method) is deprecated.
+        Please use Impute.method!(data) or impute!(imputor, data).
+        """,
+        :impute!
+    )
+    imputor_type = imputation_methods[method]
+    imputor = if length(args) > 0
+        imputor_type(args...; context=Context(; limit=limit))
+    else
+        imputor_type(; context=Context(; limit=limit))
+    end
+
+    return impute!(imputor, data)
+end
+
+"""
+    impute!(data, missing::Function, method::Symbol=:interp, args...; limit::Float64=0.1)
+
+Creates the appropriate `Imputor` type and `Context` (using `missing` function) in order to call
+`impute!(imputor::Imputor, ctx::Context, data)` with them.
+
+# Arguments
+* `data`: the datset containing missing elements we should impute.
+* `missing::Function`: the missing data function to use
+* `method::Symbol`: the imputation method to use
+    (options: [`:drop`, `:fill`, `:interp`, `:locf`, `:nocb`])
+* `args::Any...`: any arguments you should pass to the `Imputor` constructor.
+* `limit::Float64`: missing data ratio limit/threshold (default: 0.1)
+"""
+function impute!(data, missing::Function, method::Symbol, args...; limit::Float64=0.1)
+    Base.depwarn(
+        """
+        impute!(data, missing, method) is deprecated. Please use impute!(imputor, data).
+        """,
+        :impute!
+    )
+    imputor_type = imputation_methods[method]
+    imputor = if length(args) > 0
+        imputor_type(args...; context=Context(; limit=limit))
+    else
+        imputor_type(; context=Context(; limit=limit))
+    end
+
+    return impute!(imputor, data)
+end
+
+"""
+    impute(data, args...; kwargs...)
+
+Copies the `data` before calling `impute!(new_data, args...; kwargs...)`
+"""
+function impute(data, args...; kwargs...)
+    Base.depwarn(
+        """
+        impute(data, args...; kwargs...) is deprecated.
+        Please use Impute.method(data) or impute(imputor, data).
+        """,
+        :impute
+    )
+    return impute!(deepcopy(data), args...; kwargs...)
+end
+
+#################################
+# Deprecate the chain functions #
+#################################
+"""
+    chain!(data, missing::Function, imputors::Imputor...; kwargs...)
+
+Creates a `Chain` with `imputors` and calls `impute!(imputor, missing, data; kwargs...)`
+"""
+function chain!(data, missing::Function, imputors::Imputor...; kwargs...)
+    Base.depwarn(
+        """
+        chain!(data, missing, imputors...) is deprecated.
+        Please use data = imp1(data) |> imp2 |> imp3
+        """,
+        :chain!
+    )
+    return chain!(data, imputors...; is_missing=missing, kwargs...)
+end
+
+"""
+    chain!(data, imputors::Imputor...; kwargs...)
+
+Creates a `Chain` with `imputors` and calls `impute!(imputor, data; kwargs...)`
+"""
+function chain!(data, imputors::Imputor...; kwargs...)
+    Base.depwarn(
+        """
+        chain!(data, imputors...) is deprecated.
+        Please use data = imp1(data) |> imp2 |> imp3
+        """,
+        :chain!
+    )
+    ctx = Context(; kwargs...)
+
+    for imputor in imputors
+        imp = typeof(imputor)(
+            (isa(x, AbstractContext) ? ctx : x for x in fieldvalues(imputor))...
+        )
+        data = impute!(imp, data)
+    end
+
+    return data
+end
+
+"""
+    chain(data, args...; kwargs...)
+
+Copies the `data` before calling `chain!(data, args...; kwargs...)`
+"""
+function chain(data, args...; kwargs...)
+    Base.depwarn(
+        """
+        chain(data, args...) is deprecated.
+        Please use result = imp1(data) |> imp2 |> imp3
+        """,
+        :chain
+    )
+    result = deepcopy(data)
+    return chain!(data, args...; kwargs...)
+end
+
+#####################
+# Misc Deprecations #
+#####################
+Base.@deprecate Fill(val; kwargs...) Fill(; value=val, kwargs...)