repl: add block-based history navigation#64477
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Add experimental REPL enhancements behind the --experimental-repl-enhancements flag: 1. Inline syntax highlighting using the Acorn tokenizer to colorize keywords (magenta), strings (green), numbers (yellow), booleans/null (yellow), regular expressions (red), and comments (gray). 2. Auto-indentation for multiline input based on brace/bracket/paren depth, using 2-space indentation. 3. Function signature hints that display parameter lists as dimmed text below the input when the user types a function call. All features are off by default and require the CLI flag to enable. Highlighting is applied at display time only so cursor positioning and evaluation are unaffected. Refs: nodejs#48164 Signed-off-by: hemanth <hemanth.hm@gmail.com>
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When --experimental-repl-enhancements is enabled, the Up and Down arrow keys now navigate between history entries as whole blocks instead of moving line-by-line within a recalled multiline entry. Previously, recalling a multiline function from history and pressing Up would move the cursor within that entry's lines before advancing to the previous history entry. With this change, Up/Down always jump directly to the previous/next history entry, matching the behavior of Ctrl-P/Ctrl-N. Fixes: nodejs#48146 Signed-off-by: hemanth <hemanth.hm@gmail.com>
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #64477 +/- ##
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- Coverage 90.23% 90.19% -0.05%
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Files 741 741
Lines 241375 242181 +806
Branches 45483 45642 +159
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+ Hits 217800 218427 +627
- Misses 15129 15291 +162
- Partials 8446 8463 +17
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avivkeller
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| ### `--experimental-repl-enhancements` | ||
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| <!-- YAML | ||
| added: REPLACEME | ||
| --> | ||
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| > Stability: 1 - Experimental | ||
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| Enable experimental REPL enhancements including inline syntax highlighting, | ||
| auto-indentation, function signature hints, and block-based history | ||
| navigation. See the [REPL][] documentation for details. |
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Would this be experimental, wouldn't it just be a breaking change, idomatically?
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Description
When
--experimental-repl-enhancementsis enabled, the Up and Down arrow keys now navigate between history entries as whole blocks instead of moving line-by-line within a recalled multiline entry.Problem
When recalling a multiline function from history and pressing Up, the cursor moves within that entry's lines before advancing to the previous history entry. This makes navigating history with multiline entries tedious — you have to press Up multiple times just to get past a single recalled block.
Solution
With
--experimental-repl-enhancementsenabled, Up/Down always jump directly to the previous/next history entry, matching the behavior of Ctrl-P/Ctrl-N. This makes it easy to recall multiline functions and code blocks with a single keypress.Implementation
kHistoryPrev/kHistoryNextsymbols frominternal/readline/interface_ttyWritehandler when enhancements flag is onkHistoryPrev()/kHistoryNext()directly, bypassing the multiline-move-within-entry logicFixes: #48146