Add julia_warning() function (see edwardlavender/patter#14)

Project.toml

@@ -5,6 +5,7 @@ version = "0.1.0"
 
 [deps]
 ArchGDAL = "c9ce4bd3-c3d5-55b8-8973-c0e20141b8c3"
+Crayons = "a8cc5b0e-0ffa-5ad4-8c14-923d3ee1735f"
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
 DataFramesMeta = "1313f7d8-7da2-5740-9ea0-a2ca25f37964"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"

src/001-utilities.jl

@@ -1,6 +1,18 @@
+using Crayons
 using DataFrames
 using Dates
 
+# julia_warning()
+# * This function returns 'warning' messages in red
+# * In Patter.jl, we use julia_warning() rather than @warn because the former also forces display on Windows 
+function julia_warning(msg::String)
+    crayon = Crayon(foreground = :red)
+    display(crayon("Warning: " * msg))
+    nothing
+end 
+
+# julia_warning("This is a warning!")
+
 # Check the names of a dataframe included required (req) entries
 function check_names(input::DataFrame, req)
     # If req is a single string, convert to array

src/002-spatial.jl

@@ -38,7 +38,7 @@ function asDataFrame(; x::Rasters.Raster, drop_missing::Bool = true)
     if drop_missing 
         dropmissing!(xyz, :map_value)
         if nrow(xyz) == 0
-            @warn "The map only contains missing values: empty DataFrame returned."
+            julia_warning("The map only contains missing values: empty DataFrame returned.")
         end 
     end
     return xyz

src/009-particle-filter.jl

@@ -248,7 +248,7 @@ function particle_filter(
             stop = t
             pos  = sort([start, stop])
             pos  = pos[1]:pos[2]
-            @warn  "Weights from filter ($start -> $finish) are zero at time $t): returning outputs from $(minimum(pos)):$(maximum(pos)). Note that all (log) weights at $t are -Inf."
+            julia_warning("Weights from filter ($start -> $finish) are zero at time $t): returning outputs from $(minimum(pos)):$(maximum(pos)). Note that all (log) weights at $t are -Inf.")
             return (timesteps    = collect(pos),
                     timestamps   = timeline[pos],
                     state        = xout[:, pos],