Additional string fns

2 files changed, 77 insertions, 12 deletions

diff --git a/src/iodata.gleam b/src/iodata.gleam
index 856832f..81329d0 100644
--- a/src/iodata.gleam
+++ b/src/iodata.gleam
@@ -11,7 +11,16 @@ pub external fn prepend(Iodata, String) -> Iodata =
 pub external fn append(Iodata, String) -> Iodata =
   "gleam__stdlib" "iodata_append";
 
-pub external fn concat(List(String)) -> Iodata =
+pub external fn prepend_iodata(Iodata, Iodata) -> Iodata =
+  "gleam__stdlib" "iodata_prepend";
+
+pub external fn append_iodata(Iodata, Iodata) -> Iodata =
+  "gleam__stdlib" "iodata_append";
+
+pub external fn from_strings(List(String)) -> Iodata =
+  "gleam__stdlib" "identity";
+
+pub external fn concat(List(Iodata)) -> Iodata =
   "gleam__stdlib" "identity";
 
 pub external fn new(String) -> Iodata =
@@ -23,6 +32,9 @@ pub external fn to_string(Iodata) -> String =
 pub external fn byte_size(Iodata) -> Int =
   "erlang" "iolist_size";
 
+pub external fn from_float(Float) -> Iodata =
+  "io_lib_format" "fwrite_g";
+
 test iodata {
   let iodata = new("ello")
     |> append(_, ",")
@@ -36,13 +48,26 @@ test iodata {
   iodata
   |> byte_size
   |> expect:equal(_, 13)
+
+  let iodata = new("ello")
+    |> append_iodata(_, new(","))
+    |> append_iodata(_, concat([new(" wo"), new("rld!")]))
+    |> prepend_iodata(_, new("H"))
+
+  iodata
+  |> to_string
+  |> expect:equal(_, "Hello, world!")
+
+  iodata
+  |> byte_size
+  |> expect:equal(_, 13)
 }
 
 pub external fn lowercase(Iodata) -> Iodata = "string" "lowercase"
 
 test lowercase {
   ["Gleam", "Gleam"]
-  |> concat
+  |> from_strings
   |> lowercase
   |> to_string
   |> expect:equal(_, "gleamgleam")
@@ -52,7 +77,7 @@ pub external fn uppercase(Iodata) -> Iodata = "string" "uppercase"
 
 test uppercase {
   ["Gleam", "Gleam"]
-  |> concat
+  |> from_strings
   |> uppercase
   |> to_string
   |> expect:equal(_, "GLEAMGLEAM")
@@ -77,9 +102,9 @@ test split {
   |> expect:equal(_, [new("Gleam"), new("Erlang"), new("Elixir")])
 
   ["Gleam, Erl", "ang,Elixir"]
-  |> concat
+  |> from_strings
   |> split(_, ", ")
-  |> expect:equal(_, [new("Gleam"), concat(["Erl", "ang,Elixir"])])
+  |> expect:equal(_, [new("Gleam"), from_strings(["Erl", "ang,Elixir"])])
 }
 
 external fn erl_replace(Iodata, String, String, Direction) -> Iodata =
@@ -93,7 +118,7 @@ pub external fn is_equal(Iodata, Iodata) -> Bool = "string" "equal"
 
 test is_equal {
   new("12")
-  |> is_equal(_, concat(["1", "2"]))
+  |> is_equal(_, from_strings(["1", "2"]))
   |> expect:true
 
   new("12")
@@ -116,11 +141,11 @@ test is_empty {
   |> is_empty
   |> expect:false
 
-  concat([])
+  from_strings([])
   |> is_empty
   |> expect:true
 
-  concat(["", ""])
+  from_strings(["", ""])
   |> is_empty
   |> expect:true
 }
diff --git a/src/str.gleam b/src/str.gleam
index 8aa3e29..b09b8dc 100644
--- a/src/str.gleam
+++ b/src/str.gleam
@@ -16,10 +16,6 @@ test length {
 
   length("")
   |> expect:equal(_, 0)
-
-  // TODO: This crashes.
-  // length("é")
-  // |> expect:equal(_, 1)
 }
 
 pub external fn lowercase(String) -> String = "string" "lowercase"
@@ -77,3 +73,47 @@ test replace {
   |> replace(_, ",", "++")
   |> expect:equal(_, "Gleam++Erlang++Elixir")
 }
+
+pub external fn from_int(Int) -> String = "erlang" "integer_to_binary"
+
+test from_int {
+  123
+  |> from_int
+  |> expect:equal(_, "123")
+
+  -123
+  |> from_int
+  |> expect:equal(_, "-123")
+
+  0123
+  |> from_int
+  |> expect:equal(_, "123")
+}
+
+pub external fn base_from_int(Int, Int) -> String = "erlang" "integer_to_binary"
+
+test base_from_int {
+  100
+  |> base_from_int(_, 16)
+  |> expect:equal(_, "64")
+
+  -100
+  |> base_from_int(_, 16)
+  |> expect:equal(_, "-64")
+}
+
+pub fn from_float(f) {
+  f
+  |> iodata:from_float
+  |> iodata:to_string
+}
+
+test from_float {
+  123.0
+  |> from_float
+  |> expect:equal(_, "123.0")
+
+  -8.1
+  |> from_float
+  |> expect:equal(_, "-8.1")
+}