Add rprompt support for right-side prompt display #878
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This adds support for displaying a right-aligned prompt (rprompt)
similar to zsh's RPROMPT feature. The rprompt is displayed at the
right edge of the terminal and automatically hides when the input
line gets too long.
Usage:
Reline.rprompt = "[%H:%M]"
Reline.readline("> ")
The rprompt is rendered as part of Reline's normal render cycle,
so it persists during line editing unlike workarounds using
pre_input_hook.
tompng
reviewed
Jan 17, 2026
| content_end = first_line.sum { |_, width, _| width } | ||
| # Only show rprompt if there's at least 1 char gap between content and rprompt | ||
| if right_col > content_end | ||
| first_line << [right_col, rprompt_width, @rprompt] |
Member
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This part adds segment of rpromt to new_lines[idx][2]. This part is OK, but segments added by dialog is now problematic.
Can you also change the dialog segment adding part?
# index 0 is for prompt, index 1 is for line, index 2.. is for dialog
dialog_rows[index + 2] = [x_range.begin, dialog.width, dialog.contents[row - y_range.begin]]index 2 is now used for rpromt, so dialogs should use index 3..
This is a current restriction of differential calculation assumption: same index represents logically same thing. Sorry for the inconvenience of this restriction.
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Summary
This patch adds support for displaying a right-aligned prompt (
rprompt) similar to zsh'sRPROMPTfeature.Usage
Implementation
rpromptattribute toReline::Core(reader + setter)rprompttoLineEditorininner_readlineLineEditor#render, add rprompt as a segment on the first visible line at[right_col, width, text]Motivation
I wanted to have this feature for my app that I'm building on top of Reline, and found it difficult to implement without patching Reline itself.
Testing
Behavior of the RPROMPT feature can be confirmed with something like this.