providers: Bring math provider back into service

Sprig is missing some float math functions

providers/all.go

@@ -6,6 +6,7 @@ import fplog      "git.tebibyte.media/sashakoshka/step/providers/log"
 import fphttp     "git.tebibyte.media/sashakoshka/step/providers/http"
 import fppath     "git.tebibyte.media/sashakoshka/step/providers/path"
 import fpmime     "git.tebibyte.media/sashakoshka/step/providers/mime"
+import fpmath     "git.tebibyte.media/sashakoshka/step/providers/math"
 import fpsprig    "git.tebibyte.media/sashakoshka/step/providers/sprig"
 import fpimport   "git.tebibyte.media/sashakoshka/step/providers/import"
 import fpcrypto   "git.tebibyte.media/sashakoshka/step/providers/crypto"
@@ -22,6 +23,7 @@ func All () []step.Provider {
 		new(fphttp.Provider),
 		new(fppath.Provider),
 		new(fpmime.Provider),
+		new(fpmath.Provider),
 		new(fpsprig.Provider),
 		new(fpimport.Provider),
 		new(fpcrypto.Provider),

providers/math/math.go

@@ -19,27 +19,10 @@ func (this *Provider) Package () string {
 // FuncMap fulfills the step.FuncProvider interface.
 func (this *Provider) FuncMap () template.FuncMap {
 	return template.FuncMap {
-		"add":  funcAdd,
-		"sub":  funcSub,
-		"mul":  funcMul,
-		"div":  funcDiv,
-		"pow":  math.Pow,
-		"sqrt": math.Sqrt,
+		"modf": funcModf,
 	}
 }
 
-func funcAdd (a, b float64) float64 {
-	return a + b
-}
-
-func funcSub (a, b float64) float64 {
-	return a - b
-}
-
-func funcMul (a, b float64) float64 {
-	return a * b
-}
-
-func funcDiv (a, b float64) float64 {
-	return a / b
+func funcModf (a, b float64) float64 {
+	return math.Mod(a, b)
 }