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Use simplified keymap for dumb terminal #874

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merged 2 commits into from
Oct 20, 2023
Merged

Use simplified keymap for dumb terminal #874

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bccb071
use simplified keymap for dumb terminal
hvesalai Oct 18, 2023
2063657
fix AbstractWindowsTerminalTest
hvesalai Oct 20, 2023
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1 change: 1 addition & 0 deletions reader/src/main/java/org/jline/reader/LineReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -283,6 +283,7 @@ public interface LineReader {
String MAIN = "main";
String EMACS = "emacs";
String SAFE = ".safe";
String DUMB = "dumb";
String MENU = "menu";

//
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15 changes: 13 additions & 2 deletions reader/src/main/java/org/jline/reader/impl/LineReaderImpl.java
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Expand Up @@ -5997,6 +5997,8 @@ public Map<String, KeyMap<Binding>> defaultKeyMaps() {
keyMaps.put(VIOPP, viOpp());
keyMaps.put(VISUAL, visual());
keyMaps.put(SAFE, safe());
keyMaps.put(DUMB, dumb());

if (getBoolean(BIND_TTY_SPECIAL_CHARS, true)) {
Attributes attr = terminal.getAttributes();
bindConsoleChars(keyMaps.get(EMACS), attr);
Expand All @@ -6007,8 +6009,9 @@ public Map<String, KeyMap<Binding>> defaultKeyMaps() {
keyMap.setUnicode(new Reference(SELF_INSERT));
keyMap.setAmbiguousTimeout(getLong(AMBIGUOUS_BINDING, DEFAULT_AMBIGUOUS_BINDING));
}
// By default, link main to emacs
keyMaps.put(MAIN, keyMaps.get(EMACS));
// By default, link main to emacs unless the temrinal is dumb
keyMaps.put(MAIN, keyMaps.get(isTerminalDumb() ? DUMB : EMACS));

return keyMaps;
}

Expand Down Expand Up @@ -6263,6 +6266,14 @@ public KeyMap<Binding> safe() {
return safe;
}

public KeyMap<Binding> dumb() {
KeyMap<Binding> dumb = new KeyMap<>();
bind(dumb, SELF_INSERT, range("^@-^?"));
bind(dumb, ACCEPT_LINE, "\r", "\n");
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Would adding "\r\n" as an additional key binding help with the cr/lf issue on dumb terminals ?

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@hvesalai hvesalai Oct 19, 2023 •
edited
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That would not be deterministic then. How will the system know if to expect only \r or \r\n. Remember that there might be no immediate input after the \r. Consider the following interaction:

Time n: user inputs something that triggers SELF_INSERTs, such as "Hello"
Time n+1: user inputs \r.
Time n+m: user inputs a new thing that trigger SELF_INSERTs, not being \n, for example, "World"

Surely we cannot wait for a period of unkown m to determine whether the \r at n+1 should have triggered ACCEPT_LINE.

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@hvesalai hvesalai Oct 19, 2023 •
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Consider above with this user over a slow connection:

Time n: process is piped something that triggers SELF_INSERTs, such as "Hello"
Time n+1: process is piped \r
Time n+m: process is piped \n

Waiting for the \n here would be possible (using a short timeout > m), but that would mean that a dumb terminal would always wait after a \r to see if there is a \n following it. Sometimes it could be available, sometimes not. The bottom line is that it would in any case slow down the process.

bind(dumb, BEEP, ctrl('G'));
return dumb;
}

public KeyMap<Binding> visual() {
KeyMap<Binding> visual = new KeyMap<>();
bind(visual, UP_LINE, key(Capability.key_up), "k");
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