improve str macro doc help (JuliaLang#39110)

* improve str macro doc help

* add string macro search result

stdlib/REPL/src/docview.jl

@@ -720,7 +720,19 @@ accessible(mod::Module) =
            map(names, moduleusings(mod))...;
            collect(keys(Base.Docs.keywords))] |> unique |> filtervalid
 
-doc_completions(name) = fuzzysort(name, accessible(Main))
+function doc_completions(name) 
+    res = fuzzysort(name, accessible(Main))
+
+    # to insert an entry like `raw""` for `"@raw_str"` in `res`
+    ms = match.(r"^@(.*?)_str$", res)
+    idxs = findall(!isnothing, ms)
+
+    # avoid messing up the order while inserting
+    for i in reverse(idxs)
+        insert!(res, i, "$(only(ms[i].captures))\"\"")
+    end
+    res
+end
 doc_completions(name::Symbol) = doc_completions(string(name))
 
 

stdlib/REPL/test/docview.jl

@@ -42,6 +42,14 @@ end
     @test REPL.insert_hlines(IOBuffer(), nothing) === nothing
 end
 
+@testset "Check @var_str also completes to var\"\" in REPL.doc_completions()" begin
+    checks = ["var", "raw", "r"]
+    symbols = "@" .* checks .* "_str"
+    results = checks .* "\"\""
+    for (i,r) in zip(symbols,results)
+        @test r ∈ REPL.doc_completions(i)
+    end
+end
 @testset "fuzzy score" begin
     # https://github.com/JunoLab/FuzzyCompletions.jl/issues/7
     # shouldn't throw when there is a space in a middle of query

stdlib/REPL/test/replcompletions.jl

@@ -7,7 +7,7 @@ using REPL
     @testset "Check symbols previously not shown by REPL.doc_completions()" begin
     symbols = ["?","=","[]","[","]","{}","{","}",";","","'","&&","||","julia","Julia","new","@var_str"]
         for i in symbols
-            @test REPL.doc_completions(i)[1]==i
+            @test i ∈ REPL.doc_completions(i)
         end
     end
 let ex = quote