More file IO!

Can now create, delete, and write to files.

test/io/file/create.wren

@@ -0,0 +1,22 @@
+import "io" for File
+
+// Create a new file.
+var file = File.create("file.temp")
+System.print(file.isOpen) // expect: true
+System.print(file.size) // expect: 0
+
+file.writeBytes("stuff")
+file.close()
+
+System.print(File.size("file.temp")) // expect: 5
+
+// Overwrite a file.
+file = File.create("file.temp")
+
+// Truncates.
+System.print(file.size) // expect: 0
+file.close()
+
+File.delete("file.temp")
+
+// TODO: Test it cannot be read from.

test/io/file/create_block.wren

@@ -0,0 +1,25 @@
+import "io" for File
+
+// Create a new file.
+var f
+File.create("file.temp") {|file|
+  f = file
+  System.print(file.isOpen) // expect: true
+  System.print(file.size) // expect: 0
+
+  file.writeBytes("stuff")
+}
+
+// Closed on block exit.
+System.print(f.isOpen) // expect: false
+
+System.print(File.size("file.temp")) // expect: 5
+
+// Overwrite a file.
+File.create("file.temp") {|file|
+  // Truncates.
+  System.print(file.size) // expect: 0
+}
+
+File.delete("file.temp")
+// TODO: Test return value.

test/io/file/delete.wren

@@ -0,0 +1,13 @@
+import "io" for File, Stat
+
+// Create a file.
+var file = File.create("file.temp")
+file.close()
+
+File.delete("file.temp")
+
+// TODO: More graceful API to tell if a file exists.
+var error = Fiber.new {
+  Stat.path("file.temp")
+}.try()
+System.print(error) // expect: no such file or directory

test/io/file/delete_nonexistent.wren

@@ -0,0 +1,3 @@
+import "io" for File
+
+File.delete("nonexistent") // expect runtime error: no such file or directory

test/io/file/delete_open.wren

@@ -0,0 +1,14 @@
+import "io" for File, Stat
+
+// Create a file and don't close it.
+var file = File.create("file.temp")
+
+File.delete("file.temp")
+
+file.close()
+
+// TODO: More graceful API to tell if a file exists.
+var error = Fiber.new {
+  Stat.path("file.temp")
+}.try()
+System.print(error) // expect: no such file or directory

test/io/file/open_block.wren

@@ -14,3 +14,4 @@ System.print(stash.isOpen) // expect: false
 System.print(File.open("test/io/file/open_block.wren") {|file|}) // expect: null
 
 // TODO: Test a fiber aborting inside the block.
+// TODO: Test return value.

test/io/file/write_bytes.wren

@@ -0,0 +1,12 @@
+import "io" for File
+
+File.create("file.temp") {|file|
+  // Appends.
+  file.writeBytes("one")
+  file.writeBytes("two")
+  file.writeBytes("three")
+}
+
+System.print(File.read("file.temp")) // expect: onetwothree
+
+File.delete("file.temp")

test/io/file/write_bytes_after_close.wren

@@ -0,0 +1,10 @@
+import "io" for File
+
+var file = File.create("file.temp")
+file.close()
+
+System.print(Fiber.new {
+  file.writeBytes("one")
+}.try()) // expect: File is not open.
+
+File.delete("file.temp")

test/io/file/write_bytes_from_bytes_not_string.wren

@@ -0,0 +1,9 @@
+import "io" for File
+
+System.print(Fiber.new {
+  File.create("file.temp") {|file|
+    file.writeBytes(123, 0)
+  }
+}.try()) // expect: Bytes must be a string.
+
+File.delete("file.temp")

test/io/file/write_bytes_from_offset.wren

@@ -0,0 +1,11 @@
+import "io" for File
+
+File.create("file.temp") {|file|
+  file.writeBytes("prettyshort", 0)
+  file.writeBytes("agoodbitlonger", 2)
+  file.writeBytes("short", 3)
+}
+
+System.print(File.read("file.temp")) // expect: prashortitlonger
+
+File.delete("file.temp")

test/io/file/write_bytes_from_offset_negative.wren

@@ -0,0 +1,9 @@
+import "io" for File
+
+System.print(Fiber.new {
+  File.create("file.temp") {|file|
+    file.writeBytes("", -1)
+  }
+}.try()) // expect: Offset cannot be negative.
+
+File.delete("file.temp")

test/io/file/write_bytes_from_offset_not_integer.wren

@@ -0,0 +1,9 @@
+import "io" for File
+
+System.print(Fiber.new {
+  File.create("file.temp") {|file|
+    file.writeBytes("", 1.2)
+  }
+}.try()) // expect: Offset must be an integer.
+
+File.delete("file.temp")

test/io/file/write_bytes_from_offset_not_num.wren

@@ -0,0 +1,9 @@
+import "io" for File
+
+System.print(Fiber.new {
+  File.create("file.temp") {|file|
+    file.writeBytes("", "string")
+  }
+}.try()) // expect: Offset must be an integer.
+
+File.delete("file.temp")

test/io/file/write_bytes_not_string.wren

@@ -0,0 +1,9 @@
+import "io" for File
+
+System.print(Fiber.new {
+  File.create("file.temp") {|file|
+    file.writeBytes(123)
+  }
+}.try()) // expect: Bytes must be a string.
+
+File.delete("file.temp")