reverted similarterm arguments structure for compatibility. version bump

Author: Alessandro

Project.toml

@@ -1,7 +1,7 @@
 name = "TermInterface"
 uuid = "8ea1fca8-c5ef-4a55-8b96-4e9afe9c9a3c"
 authors = ["Shashi Gowda <gowda@mit.edu>", "Alessandro Cheli <sudo-woodo3@protonmail.com>"]
-version = "0.1.1"
+version = "0.1.2"
 
 [compat]
 julia = "1"

src/TermInterface.jl

@@ -83,20 +83,23 @@ end
 
 
 """
-    similarterm(x, head, args; type=nothing, metadata=nothing)
+    similarterm(x, head, args, symtype=nothing; metadata=nothing)
 
 Returns a term that is in the same closure of types as `typeof(x)`,
 with `head` as the head and `args` as the arguments, `type` as the symtype
 and `metadata` as the metadata. By default this will execute `head(args...)`.
 `x` parameter can also be a `Type`.
 """
-similarterm(x, head, args; type=nothing, metadata=nothing) = 
-    similarterm(typeof(x), head, args; type=type, metadata=nothing)
-similarterm(x::Type{Expr}, head, args; type=nothing, metadata=nothing) = Expr(head, args...)
-function similarterm(x::Type{T}, head::T, args; type=nothing, metadata=nothing) where T
+similarterm(x, head, args, symtype=nothing; metadata=nothing) = 
+    similarterm(typeof(x), head, args, type; metadata=nothing)
+
+similarterm(x::Type{Expr}, head, args, symtype=nothing; metadata=nothing) = Expr(head, args...)
+function similarterm(x::Type{T}, head::T, args, symtype=nothing; metadata=nothing) where T
     if !isterm(T) head else head(args...) end
 end 
 export similarterm
 
+include("utils.jl")
+
 end # module
 

src/utils.jl

@@ -0,0 +1,8 @@
+"""
+    is_operation(f)
+
+Returns a single argument anonymous function predicate, that returns `true` if and only if
+the argument to the predicate satisfies `isterm` and `gethead(x) == f` 
+"""
+is_operation(f) = @nospecialize(x) -> isterm(x) && (gethead(x) == f)
+export is_operation