Use JLine 3 in the REPL #4680
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Use JLine 3 in the REPL #4680
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allanrenucci
commented
Jun 18, 2018
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| context match { | ||
| case ParseContext.ACCEPT_LINE => | ||
| // TODO: take into account cursor position |
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@lihaoyi In Ammonite, when do you consider a line to be complete or not?
I am thinking of doing something like: A line is considered incomplete
- if the cursor position is before the last non-whitespace character
- if the cursor position is before the last closing parenthese
Either (1) or (2)
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@allanrenucci not sure what context you are asking this in, but ENTER means "submit" instead of "add a newline to this cell" if parsing the cell results in a failure whose parse-index is right at the end of the cell's text (or the cursor is not on the last line of the cell)
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It makes sense. Thanks!
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@sjrd Can you try it out on Windows? You can start the REPL from sbt by running the |
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I got an exception while trying to run on windows: |
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@allanrenucci Note that we have a Windows VM at LAMP you can use to experiment, ask Fabien to get access. |
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@Glavo The last commit should fix the issue you encountered |
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A NullPointerException was thrown when I pressed Ctrl+C in cmd: |
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In addition, autocomplete does not work under Windows. |
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REPL now does not highlight the text entered: The screen shows: |
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On Windows, the REPL doesn't work from the Dotty build. JLine is not able to create a terminal in the forked JVM created by sbt. @Glavo If you want to try out the repl on windows, here is what you can do:
Also |
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When I tried to do this, I got an exception: |
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It looks like our and we need to add the corresponding bat script (#1207) |
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smarter
approved these changes
Jun 28, 2018
| @@ -23,6 +23,12 @@ object Reporter { | |||
| simple.report(m) | |||
| } | |||
| } | |||
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| /** A reporter that ignores reports */ | |||
| object NoReporter extends Reporter { | |||
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Scalac has something similar called NoReporter. It is more that silent, it doesn't even count errors
| private val prompt = blue("scala> ") | ||
| private val newLinePrompt = blue(" | ") | ||
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| /** Blockingly read line from `System.in` |
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Can we take an InputStream instead of hardcoding System.in ? For tests we shouldn't have to use System.in.
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JlineLine doesn't seem to let you configure the input stream and we should probably not modify System.in. We don't do end to end testing for the REPL, the tests don't rely on JLine
| // ENTER means SUBMIT when | ||
| // - cursor is at end (discarding whitespaces) | ||
| // - and, input line is complete | ||
| val cursorIsAtEnd = line.indexWhere(!_.isWhitespace, from = cursor) >= 0 |
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Should be called cursorNotAtEnd no? In any case, it's a bit confusing that the comment above describes the conditions for submitting, but the code checks the conditions for not submitting, either the code logic or the comment should be changed.
| .variable(LineReader.SECONDARY_PROMPT_PATTERN, "%M") | ||
| .option(Option.INSERT_TAB, true) // at the beginning of the line, insert tab instead of completing | ||
| .option(Option.AUTO_FRESH_LINE, true) // if not at start of line before prompt, move to new line | ||
| .variable(SECONDARY_PROMPT_PATTERN, "%M") |
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add a comment explaining what this does?
| @@ -97,39 +99,44 @@ final class JLineTerminal extends java.io.Closeable { | |||
| /* message = */ "", | |||
| /* missing = */ newLinePrompt) | |||
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| case class TokenData(token: Token, start: Int, end: Int) | |||
I think it is either a bug in sbt or JLine. It should not affect users, only contributors working on Windows. Since I'm not on Windows, it is a bit cumbersome for me to minimise and report an issue |
- cursor is at end (discarding whitespaces) - and, input line is complete
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