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Add Text.write
Function (#3518)
Implements https://www.pivotaltracker.com/story/show/182309026
This commit is contained in:
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@ -138,6 +138,7 @@
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- [Renamed `File_Format.Text` to `Plain_Text`, updated `File_Format.Delimited`
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API and added builders for customizing less common settings.][3516]
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- [Allow control of sort direction in `First` and `Last` aggregations.][3517]
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- [Implemented `Text.write`, replacing `File.write_text`.][3518]
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[debug-shortcuts]:
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https://github.com/enso-org/enso/blob/develop/app/gui/docs/product/shortcuts.md#debug
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@ -217,6 +218,7 @@
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[3515]: https://github.com/enso-org/enso/pull/3515
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[3516]: https://github.com/enso-org/enso/pull/3516
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[3517]: https://github.com/enso-org/enso/pull/3517
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[3518]: https://github.com/enso-org/enso/pull/3518
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#### Enso Compiler
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@ -53,4 +53,4 @@ component-groups:
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- Standard.Base.Data.Vector.Vector.distinct
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- Output:
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exports:
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- Standard.Base.System.File.File.write_text
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- Standard.Base.Data.Text.Text.write
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@ -1,6 +1,7 @@
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from Standard.Base import all
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import Standard.Base.System.File.Option
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import Standard.Base.System.File.Existing_File_Behavior
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import Standard.Base.Data.Text.Matching_Mode
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import Standard.Base.Data.Text.Text_Sub_Range
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from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding
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@ -13,8 +14,10 @@ polyglot java import java.io.InputStream as Java_Input_Stream
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polyglot java import java.io.IOException
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polyglot java import java.nio.file.AccessDeniedException
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polyglot java import java.nio.file.NoSuchFileException
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polyglot java import java.nio.file.FileAlreadyExistsException
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polyglot java import java.nio.file.FileSystems
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polyglot java import java.nio.file.Path
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polyglot java import java.nio.file.StandardCopyOption
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## ALIAS New File
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@ -89,36 +92,6 @@ read_text path (encoding=Encoding.utf_8) (on_problems=Report_Warning) =
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_ -> Error.throw (Illegal_Argument_Error "path should be either a File or a Text")
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file.read_text encoding on_problems
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## ALIAS Write Text File
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Open and write to the file at the provided `path`.
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Arguments:
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- path: The path of the file to open and read the contents of. It will
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accept a textual path or a file.
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- contents: The text to write to the file.
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- encoding: The text encoding to decode the file with. Defaults to UTF-8.
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? Module or Instance?
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If you have a variable `file` of type `File`, we recommend calling the
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`.read_text` method on it directly, rather than using
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`File.read_text file`. The later, however, will still work.
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> Example
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Read the `data.csv` file from the Examples project.
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import Standard.Base.System.File
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import Standard.Examples
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example_read = File.read_text Examples.csv_path
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write_text : (Text | File) -> Text -> Encoding -> Text
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write_text path contents (encoding=Encoding.utf_8) =
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file = case path of
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Text -> (here.new path)
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File _ -> path
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_ -> Error.throw (Illegal_Argument_Error "path should be either a File or a Text")
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file.write_text contents encoding
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## ALIAS Current Directory
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Returns the current working directory (CWD) of the current program.
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@ -311,20 +284,6 @@ type File
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opts = [Option.Append, Option.Create]
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this.with_output_stream opts (_.write_bytes contents)
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## Appends a UTF-8 encoded `Text` at the end of this file.
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Arguments:
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- contents: The UTF-8 encoded text to append to the file.
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> Example
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Append the text "hello" to a file.
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import Standard.Examples
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example_append = Examples.scratch_file.append "hello"
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append : Text -> Nothing ! File_Error
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append contents = this.append_bytes contents.utf_8
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## Writes a number of bytes into this file, replacing any existing contents.
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Arguments:
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@ -344,27 +303,6 @@ type File
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this.with_output_stream opts (_.write_bytes contents)
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Nothing
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## ALIAS Write Text File
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Writes a `Text` into this file with specified encoding, replacing any
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existing contents.
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Arguments:
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- contents: The text to write to the file.
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- encoding: The text encoding to decode the file with. Defaults to UTF-8.
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If the file does not exist, it will be created.
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> Example
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Write the text "hello" to a file.
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import Standard.Examples
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example_write = Examples.scratch_file.write "hello"
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write_text : Text -> Encoding -> Nothing ! File_Error
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write_text contents (encoding=Encoding.utf_8) =
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this.write_bytes <| contents.bytes encoding
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## Join two path segments together.
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Arguments:
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@ -561,12 +499,24 @@ type File
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example_delete =
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file = Examples.data_dir / "my_file"
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file.write_text "hello"
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"hello".write file
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file.delete
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delete : Nothing ! File_Error
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delete =
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here.handle_java_exceptions this this.prim_file.delete
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## Moves the file to the specified destination.
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Arguments:
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- destination: the destination to move the file to.
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- replace_existing: specifies if the operation should proceed if the
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destination file already exists. Defaults to `True`.
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move_to : File -> Boolean -> Nothing ! File_Error
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move_to destination replace_existing=True =
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here.handle_java_exceptions this <| case replace_existing of
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True -> this.prim_file.move destination.prim_file StandardCopyOption.REPLACE_EXISTING
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False -> this.prim_file.move destination.prim_file
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## Deletes the file if it exists on disk.
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If the file is a directory, it must be empty, otherwise a `Panic` will
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@ -891,8 +841,9 @@ handle_java_exceptions file ~action =
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Converts a Java `IOException` into its Enso counterpart.
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wrap_io_exception file io_exception =
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if Java.is_instance io_exception NoSuchFileException then Error.throw (File_Not_Found file) else
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if Java.is_instance io_exception AccessDeniedException then Error.throw (Io_Error file "You do not have permission to access the file") else
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Error.throw (Io_Error file "An IO error has occurred: "+io_exception.getMessage)
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if Java.is_instance io_exception FileAlreadyExistsException then Error.throw (File_Already_Exists_Error file) else
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if Java.is_instance io_exception AccessDeniedException then Error.throw (Io_Error file "You do not have permission to access the file") else
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Error.throw (Io_Error file "An IO error has occurred: "+io_exception.getMessage)
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## PRIVATE
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@ -911,6 +862,9 @@ type File_Error
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- file: The file that doesn't exist.
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type File_Not_Found file
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## Indicates that a destination file already exists.
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type File_Already_Exists_Error file
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## A generic IO error.
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Arguments:
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@ -925,6 +879,7 @@ type File_Error
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to_display_text = case this of
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File_Not_Found file -> "The file at " + file.path + " does not exist."
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Io_Error file msg -> msg.to_text + " (" + file.path + ")."
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File_Already_Exists_Error file -> "The file at "+file.path+" already exists."
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## PRIVATE
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@ -975,3 +930,29 @@ get_file path = @Builtin_Method "File.get_file"
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Gets the textual path to the user's system-defined home directory.
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user_home : Text
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user_home = @Builtin_Method "File.user_home"
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## Writes (or appends) the specified bytes to the specified file.
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The behavior specified in the `existing_file` parameter will be used if the
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file exists.
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Arguments:
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- path: The path to the target file.
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- encoding: The encoding to use when writing the file.
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- on_existing_file: Specifies how to proceed if the file already exists.
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- on_problems: Specifies how to handle any encountered problems.
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If a character cannot be converted to a byte, an `Encoding_Error` is raised.
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If `on_problems` is set to `Report_Warning` or `Ignore`, it is replaced with
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a substitute (either <20> (if Unicode) or ? depending on the encoding).
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Otherwise, the process is aborted.
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If the path to the parent location cannot be found or the filename is
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invalid, a `File_Not_Found` is raised.
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If another error occurs, such as access denied, an `Io_Error` is raised.
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Otherwise, the file is created with the encoded text written to it.
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Text.write : (File|Text) -> Encoding -> Existing_File_Behavior -> Problem_Behavior -> Nothing ! Encoding_Error | Illegal_Argument_Error | File_Not_Found | Io_Error | File_Already_Exists_Error
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Text.write path encoding=Encoding.utf_8 on_existing_file=Existing_File_Behavior.Backup on_problems=Report_Warning =
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bytes = this.bytes encoding on_problems
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file = here.new path
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on_existing_file.write file stream->
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stream.write_bytes bytes
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@ -0,0 +1,89 @@
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from Standard.Base import all
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import Standard.Base.System.File.Option
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from Standard.Base.System.File import File_Already_Exists_Error, Io_Error, File_Not_Found
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## Specifies the behavior of a write operation when the destination file
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already exists.
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type Existing_File_Behavior
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## Replace the existing file in-place, with the new file.
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Note: There is a risk of data loss if a failure occurs during the write
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operation.
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type Overwrite
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## Creates a backup of the existing file (by appending a `.bak` suffix to
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the name) before replacing it with the new contents.
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Note: This requires sufficient storage to have two copies of the file.
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If an existing `.bak` file exists, it will be replaced.
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type Backup
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## Appends data to the existing file.
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type Append
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## If the file already exists, a `File_Already_Exists_Error` error is
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raised.
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type Error
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## PRIVATE
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Runs the `action` which is given a file output stream and should write
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the required contents to it.
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The handle is configured depending on the specified behavior, it may
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point to a temporary file, for example. The stream may only be used while
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the action is being executed and it should not be stored anywhere for
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later.
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The `action` may not be run at all in case the `Error` behavior is
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selected.
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write : File -> (Output_Stream -> Nothing) -> Nothing ! File_Not_Found | Io_Error | File_Already_Exists_Error
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write file action =
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case this of
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Overwrite -> file.with_output_stream [Option.Write, Option.Create, Option.Truncate_Existing] action
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Append -> file.with_output_stream [Option.Write, Option.Create, Option.Append] action
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Error -> file.with_output_stream [Option.Write, Option.Create_New] action
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Backup -> Panic.recover [Io_Error, File_Not_Found] <|
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handle_existing_file _ =
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here.write_file_backing_up_old_one file action
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## We first attempt to write the file to the original
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destination, but if that files due to the file already
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existing, we will run the alternative algorithm which uses a
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temporary file and creates a backup.
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Panic.catch File_Already_Exists_Error handler=handle_existing_file <|
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Panic.rethrow <| file.with_output_stream [Option.Write, Option.Create_New] action
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## PRIVATE
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write_file_backing_up_old_one : File -> (Output_Stream -> Nothing) -> Nothing ! File_Not_Found | Io_Error | File_Already_Exists_Error
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write_file_backing_up_old_one file action = Panic.recover [Io_Error, File_Not_Found] <|
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parent = file.parent
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bak_file = parent / file.name+".bak"
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go i =
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new_name = file.name + ".new" + if i == 0 then "" else "." + i.to_text
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new_file = parent / new_name
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handle_existing_file _ = go i+1
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handle_write_failure panic =
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## Since we were already inside of the write operation,
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the file must have been created, but since we failed, we need to clean it up.
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new_file.delete
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Panic.throw panic.payload.cause
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Panic.catch File_Already_Exists_Error handler=handle_existing_file <|
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Panic.catch Internal_Write_Operation_Failed handler=handle_write_failure <|
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Panic.rethrow <|
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new_file.with_output_stream [Option.Write, Option.Create_New] output_stream->
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Panic.catch Any (action output_stream) caught_panic->
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Panic.throw (Internal_Write_Operation_Failed caught_panic)
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## We ignore the file not found error, because it means that there
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is no file to back-up. This may also be caused by someone
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removing the original file during the time when we have been
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writing the new one to the temporary location. There is nothing
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to back-up anymore, but this is not a failure, so it can be
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safely ignored.
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Panic.catch File_Not_Found handler=(_->Nothing) <|
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Panic.rethrow <| file.move_to bak_file
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Panic.rethrow <| new_file.move_to file
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go 0
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## PRIVATE
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type Internal_Write_Operation_Failed (cause : Caught_Panic)
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@ -1306,7 +1306,7 @@ type Table
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example_to_csv = Examples.inventory_table.write_csv (Enso_Project.data / 'example.json')
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write_json : File.File -> Nothing
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write_json file = file.write_text this.to_json.to_text
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write_json file = this.to_json.to_text.write file
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## UNSTABLE
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if config.should_output_junit then
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builder.append '</testsuites>\n'
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config.output_path.parent.create_directory
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config.output_path.write_text builder.toString
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builder.toString.write config.output_path
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result
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@ -4,6 +4,7 @@ import com.oracle.truffle.api.TruffleFile;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.file.CopyOption;
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import java.nio.file.OpenOption;
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/**
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@ -89,6 +90,10 @@ public class EnsoFile {
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truffleFile.delete();
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}
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public void move(EnsoFile target, CopyOption... options) throws IOException {
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truffleFile.move(target.truffleFile, options);
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}
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public boolean startsWith(EnsoFile parent) {
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return truffleFile.startsWith(parent.truffleFile);
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}
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2
test/Table_Tests/data/transient/.gitignore
vendored
2
test/Table_Tests/data/transient/.gitignore
vendored
@ -1 +1 @@
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*.csv
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*.csv*
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@ -109,7 +109,7 @@ spec =
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create_file name ending_style =
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lines = ['a,b,c', 'd,e,f', '1,2,3']
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text = lines.join ending_style
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(path name).write_text text Encoding.utf_8
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text.write (path name)
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test_file name =
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table = File.read (path name) (Delimited "," headers=True value_formatter=Nothing) Problem_Behavior.Report_Error
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@ -126,7 +126,7 @@ spec =
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test_file 'cr.csv'
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# Currently mixed line endings are not supported.
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(path 'mixed.csv').write_text 'a,b,c\nd,e,f\r1,2,3'
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'a,b,c\nd,e,f\r1,2,3'.write (path 'mixed.csv')
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File.read (path 'mixed.csv') (Delimited "," headers=True value_formatter=Nothing) Problem_Behavior.Report_Error . should_fail_with Invalid_Row
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Test.specify "should work with Windows-1252 encoding" <|
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2
test/Tests/data/transient/.gitignore
vendored
2
test/Tests/data/transient/.gitignore
vendored
@ -1 +1 @@
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*.txt
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*.txt*
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|
@ -1,6 +1,8 @@
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from Standard.Base import all
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from Standard.Base.Data.Text.Encoding as Encoding_Module import Encoding, Encoding_Error
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import Standard.Base.System.File.Existing_File_Behavior
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from Standard.Base.System.File import File_Already_Exists_Error
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import Standard.Test
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import Standard.Test.Problems
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@ -46,7 +48,7 @@ spec =
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f = Enso_Project.data / "short.txt"
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f.delete_if_exists
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f.exists.should_be_false
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f.write_text "Cup"
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"Cup".write f on_existing_file=Existing_File_Behavior.Overwrite
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f.with_input_stream stream->
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stream.read_byte.should_equal 67
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stream.read_byte.should_equal 117
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@ -118,18 +120,111 @@ spec =
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contents_2.should .start_with "Cupcake ipsum dolor sit amet."
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Test.group "write operations" <|
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Test.specify "should write and append to files" <|
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f = Enso_Project.data / "work.txt"
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transient = Enso_Project.data / "transient"
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Test.specify "should allow to append to files" <|
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f = transient / "work.txt"
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f.delete_if_exists
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f.exists.should_be_false
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f.write_text "line 1!"
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"line 1!".write f on_existing_file=Existing_File_Behavior.Append
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f.exists.should_be_true
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f.read_text.should_equal "line 1!"
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f.append '\nline 2!'
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'\nline 2!'.write f on_existing_file=Existing_File_Behavior.Append
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f.read_text.should_equal 'line 1!\nline 2!'
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f.delete
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f.exists.should_be_false
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Test.specify "should allow to overwrite files" <|
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f = transient / "work.txt"
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f.delete_if_exists
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f.exists.should_be_false
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"line 1!".write f on_existing_file=Existing_File_Behavior.Overwrite . should_equal Nothing
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f.exists.should_be_true
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f.read_text.should_equal "line 1!"
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'line 2!'.write f on_existing_file=Existing_File_Behavior.Overwrite . should_equal Nothing
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f.read_text.should_equal 'line 2!'
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f.delete
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f.exists.should_be_false
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Test.specify "should fail if a file already exists, depending on the settings" <|
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f = transient / "work.txt"
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f.delete_if_exists
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f.exists.should_be_false
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"line 1!".write f on_existing_file=Existing_File_Behavior.Error . should_equal Nothing
|
||||
f.exists.should_be_true
|
||||
f.read_text.should_equal "line 1!"
|
||||
"line 2!".write f on_existing_file=Existing_File_Behavior.Error . should_fail_with File_Already_Exists_Error
|
||||
f.read_text.should_equal 'line 1!'
|
||||
f.delete
|
||||
f.exists.should_be_false
|
||||
|
||||
Test.specify "should create a backup when writing a file" <|
|
||||
f = transient / "work.txt"
|
||||
f.delete_if_exists
|
||||
f.exists.should_be_false
|
||||
"line 1!".write f . should_equal Nothing
|
||||
if f.exists.not then
|
||||
Test.fail "The file should have been created."
|
||||
f.read_text.should_equal "line 1!"
|
||||
|
||||
bak = transient / "work.txt.bak"
|
||||
"backup content".write bak on_existing_file=Existing_File_Behavior.Overwrite
|
||||
|
||||
n0 = transient / "work.txt.new"
|
||||
n1 = transient / "work.txt.new.1"
|
||||
n2 = transient / "work.txt.new.2"
|
||||
n3 = transient / "work.txt.new.3"
|
||||
n4 = transient / "work.txt.new.4"
|
||||
written_news = [n0, n1, n2, n4]
|
||||
written_news.each n->
|
||||
"new content".write n on_existing_file=Existing_File_Behavior.Overwrite
|
||||
n3.delete_if_exists
|
||||
|
||||
"line 2!".write f . should_equal Nothing
|
||||
f.read_text.should_equal 'line 2!'
|
||||
bak.read_text.should_equal 'line 1!'
|
||||
if n3.exists then
|
||||
Test.fail "The temporary file should have been cleaned up."
|
||||
written_news.each n->
|
||||
n.read_text . should_equal "new content"
|
||||
[f, bak, n0, n1, n2, n4].each .delete
|
||||
|
||||
Test.specify "should correctly handle failure of the write operation when working with the backup" <|
|
||||
f = transient / "work.txt"
|
||||
"OLD".write f on_existing_file=Existing_File_Behavior.Overwrite
|
||||
bak_file = transient / "work.txt.bak"
|
||||
new_file = transient / "work.txt.new"
|
||||
[bak_file, new_file].each .delete_if_exists
|
||||
|
||||
result = Panic.recover Illegal_State_Error <|
|
||||
Existing_File_Behavior.Backup.write f output_stream->
|
||||
output_stream.write_bytes "foo".utf_8
|
||||
Panic.throw (Illegal_State_Error "baz")
|
||||
output_stream.write_bytes "bar".utf_8
|
||||
result.should_fail_with Illegal_State_Error
|
||||
result.catch.message . should_equal "baz"
|
||||
f.read_text . should_equal "OLD"
|
||||
if bak_file.exists then
|
||||
Test.fail "If the operation failed, we shouldn't have even created the backup."
|
||||
if new_file.exists then
|
||||
Test.fail "The temporary file should have been cleaned up."
|
||||
|
||||
f.delete
|
||||
result2 = Panic.recover Illegal_State_Error <|
|
||||
Existing_File_Behavior.Backup.write f output_stream->
|
||||
output_stream.write_bytes "foo".utf_8
|
||||
Panic.throw (Illegal_State_Error "baz")
|
||||
output_stream.write_bytes "bar".utf_8
|
||||
result2.should_fail_with Illegal_State_Error
|
||||
result2.catch.message . should_equal "baz"
|
||||
if f.exists.not then
|
||||
Test.fail "Since we were writing to the original destination, the partially written file should have been preserved even upon failure."
|
||||
f.read_text . should_equal "foo"
|
||||
if bak_file.exists then
|
||||
Test.fail "If the operation failed, we shouldn't have even created the backup."
|
||||
if new_file.exists then
|
||||
Test.fail "The temporary file should have been cleaned up."
|
||||
f.delete
|
||||
|
||||
Test.group "folder operations" <|
|
||||
resolve files =
|
||||
base = Enso_Project.data
|
||||
|
@ -29,7 +29,7 @@ spec =
|
||||
f = Enso_Project.data / "short.txt"
|
||||
f.delete_if_exists
|
||||
f.exists.should_be_false
|
||||
f.write_text "Cup"
|
||||
"Cup".write f
|
||||
java_charset = Encoding.utf_8.to_java_charset
|
||||
f.with_input_stream [File.Option.Read] stream->
|
||||
stream.with_java_stream java_stream->
|
||||
@ -45,7 +45,7 @@ spec =
|
||||
f = Enso_Project.data / "transient" / "varying_chunks.txt"
|
||||
fragment = 'Hello 😎🚀🚧!'
|
||||
contents = 1.up_to 1000 . map _->fragment . join '\n'
|
||||
f.write_text contents
|
||||
contents.write f
|
||||
java_charset = Encoding.utf_8.to_java_charset
|
||||
|
||||
all_codepoints = Vector.new_builder
|
||||
@ -104,7 +104,7 @@ spec =
|
||||
f = Enso_Project.data / "transient" / "utf8.txt"
|
||||
encoding = Encoding.utf_8
|
||||
java_charset = encoding.to_java_charset
|
||||
f.write_text ((0.up_to 100).map _->'Hello World!' . join '\n') Encoding.utf_8
|
||||
((0.up_to 100).map _->'Hello World!' . join '\n').write f
|
||||
expected_contents = f.read_text
|
||||
contents = read_file_one_by_one f java_charset expected_contents.length
|
||||
contents.should_equal expected_contents
|
||||
|
Loading…
Reference in New Issue
Block a user