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Refactor: extract history search, completion, and keymap handling into separate methods; support prefix matching for help topics

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pagedmov
2026-03-21 02:14:47 -04:00
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*autocmd* *autocmds* *hooks*
#AUTOCMDS#
Autocmds (automatic commands) execute shell commands in response to
specific events. They provide a hook system for customizing shell
behavior without modifying the shell itself.
==============================================================================
1. Registration *autocmd-register*
`autocmd [OPTIONS] {kind} {command}`
Register {command} to run whenever the event {kind} fires.
Options:
`-p {pattern}` *autocmd-pattern*
Only run this autocmd when {pattern} (a regex) matches the
event's context string. The context varies by event type:
for |autocmd-pre-cmd| it is the command being executed, for
|autocmd-post-change-dir| it is the target directory, etc.
`-c` *autocmd-clear*
Clear all autocmds of the specified {kind}. No command is
needed.
Examples:
`autocmd post-cmd 'echo "exit: $?"'`
`autocmd -p '^git' pre-cmd 'echo running git...'`
`autocmd -c pre-cmd`
==============================================================================
2. Event Kinds *autocmd-kinds*
2.1 Command Execution *autocmd-cmd-events*
`pre-cmd` *autocmd-pre-cmd*
Fires before a command is executed. The command string is
available for pattern matching.
`post-cmd` *autocmd-post-cmd*
Fires after a command finishes. The command string is available
for pattern matching.
2.2 Directory Changes *autocmd-dir-events*
`pre-change-dir` *autocmd-pre-change-dir*
Fires before `cd` changes the working directory. The target
directory is available for pattern matching.
Special variables:
`$_NEW_DIR` the directory being changed to
`$_OLD_DIR` the current directory (before the change)
`post-change-dir` *autocmd-post-change-dir*
Fires after a successful directory change.
Special variables:
`$_NEW_DIR` the new working directory
`$_OLD_DIR` the previous directory
2.3 Job Events *autocmd-job-events*
`on-job-finish` *autocmd-on-job-finish*
Fires when a background job completes. The job's command string
is available for pattern matching.
2.4 Prompt Events *autocmd-prompt-events*
`pre-prompt` *autocmd-pre-prompt*
Fires before the prompt is rendered. Useful for updating prompt
state.
`post-prompt` *autocmd-post-prompt*
Fires after the prompt is rendered.
2.5 Mode Change Events *autocmd-mode-events*
`pre-mode-change` *autocmd-pre-mode-change*
Fires before the vi editing mode changes. The `$SHED_VI_MODE`
variable still holds the old mode.
`post-mode-change` *autocmd-post-mode-change*
Fires after the vi editing mode changes. `$SHED_VI_MODE` reflects
the new mode.
2.6 History Events *autocmd-hist-events*
`on-history-open` *autocmd-on-history-open*
Fires when the fuzzy history search window opens.
Special variables:
`$_ENTRIES` array of all history entries
`$_NUM_ENTRIES` count of all entries
`$_MATCHES` array of currently matching entries
`$_NUM_MATCHES` count of matching entries
`$_SEARCH_STR` the current search string
`on-history-close` *autocmd-on-history-close*
Fires when the history search is dismissed without selecting.
`on-history-select` *autocmd-on-history-select*
Fires when a history entry is selected. The entry text is
available for pattern matching.
Special variables:
`$_HIST_ENTRY` the selected history entry
2.7 Completion Events *autocmd-comp-events*
`on-completion-start` *autocmd-on-completion-start*
Fires when the completion menu becomes visible.
Special variables:
`$_MATCHES` array of completion candidates
`$_NUM_MATCHES` count of candidates
`$_SEARCH_STR` the token being completed
`on-completion-cancel` *autocmd-on-completion-cancel*
Fires when the completion menu is dismissed without selecting.
`on-completion-select` *autocmd-on-completion-select*
Fires when a completion candidate is accepted. The candidate
is available for pattern matching.
Special variables:
`$_COMP_CANDIDATE` the selected completion candidate
2.8 Exit Event *autocmd-exit-event*
`on-exit` *autocmd-on-exit*
Fires when the shell is about to exit.
==============================================================================
3. Behavior *autocmd-behavior*
- Multiple autocmds can be registered for the same event kind. They
execute in registration order.
- If an autocmd command fails, the error is printed but subsequent
autocmds for the same event still run.
- Autocmds do not affect the shell's exit status (`$?`). The exit
status is saved before autocmd execution and restored afterward.
- Pattern matching uses Rust regex syntax. If an autocmd has no
pattern, it always fires for its event kind.
- Special variables (e.g. `$_NEW_DIR`) are only available within the
scope of the autocmd execution. They are not set globally.
==============================================================================
4. Examples *autocmd-examples*
Notify on directory change:
`autocmd post-change-dir 'echo "moved to $_NEW_DIR"'`
Run a linter only on git commands:
`autocmd -p '^git commit' post-cmd 'lint-check'`
Refresh prompt on mode change (for mode indicator):
`autocmd post-mode-change 'kill -USR1 $$'`
(SIGUSR1 can be used to remotely refresh the prompt. See |prompt|)
Log completed jobs:
`autocmd on-job-finish 'echo "job done" >> /tmp/jobs.log'`
Clean up on exit:
`autocmd on-exit 'rm -f /tmp/my-shell-*.tmp'`
==============================================================================
See also: |keybinds| |prompt| |ex|

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*ex* *ex-mode* *ex-commands* *colon-commands*
#EX MODE#
Ex mode provides colon commands for operations that go beyond single-key
normal mode actions. Enter ex mode by pressing `:` in normal mode.
The command line supports full editing via insert mode, and has its own
command history navigable with `Up` and `Down`.
==============================================================================
1. Shell Commands *ex-shell*
`:!{cmd}` *ex-bang*
Execute {cmd} in the shell. The following special variables are
set during execution and can be read or modified:
`$_BUFFER` the current editor buffer contents
`$_CURSOR` the cursor position (flat byte index)
`$_ANCHOR` the visual selection anchor position
If the command modifies these variables, the editor state is
updated accordingly. This allows ex commands to programmatically
edit the buffer.
If the command sets `$_KEYS`, the value is fed back into the
editor as a key sequence.
Example:
`:!echo "$_BUFFER" | tr a-z A-Z > /tmp/out`
`:!_BUFFER=$(echo "$_BUFFER" | sort)`
==============================================================================
2. File Operations *ex-file*
`:r {file}` *ex-read*
Read the contents of {file} and insert them into the buffer at
the cursor position.
`:r !{cmd}` *ex-read-cmd*
Execute {cmd} and insert its output into the buffer.
`:w {file}` *ex-write*
Write the buffer contents to {file}. Creates the file if it does
not exist, or truncates it if it does.
`:w >> {file}` *ex-write-append*
Append the buffer contents to {file}.
`:w !{cmd}` *ex-write-cmd*
Pipe the buffer contents to {cmd} as stdin.
`:e {file}` *ex-edit*
Open {file} in the editor defined by `$EDITOR`. Requires the
`EDITOR` environment variable to be set.
Example:
`:e ~/.config/shed/shedrc`
==============================================================================
3. Buffer Operations *ex-buffer*
`:d` *ex-delete*
Delete the entire buffer.
`:y` *ex-yank*
Yank the entire buffer into the default register.
`:pu` *ex-put*
Put (paste) from the default register after the cursor.
==============================================================================
4. Other Commands *ex-other*
`:q` *ex-quit*
Quit the editor / exit the shell.
`:help {topic}` *ex-help*
Display help for {topic}. Runs the `help` builtin.
==============================================================================
5. Path Expansion *ex-paths*
File paths in ex commands are subject to variable expansion. You can
use environment variables in paths:
`:e $HOME/.config/shed/shedrc`
`:w ${TMPDIR}/output.txt`
==============================================================================
6. Ex Command History *ex-history*
Ex mode maintains its own command history, separate from the main
shell history. Navigate with `Up` and `Down` while in ex mode.
==============================================================================
See also: |keybinds| |autocmd| |prompt|

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*keybinds* *keys* *vi-mode* *keybindings*
#VI MODE KEYBINDINGS#
The line editor uses a vi-style modal editing system with six modes:
Normal, Insert, Visual, Replace, Ex (command), and Verbatim. The default
mode on startup is Insert.
==============================================================================
1. Normal Mode *normal-mode*
Normal mode is for navigating and manipulating text. Press `Esc` from
any other mode to return here.
1.1 Movement *normal-movement*
`h` `l` *key-h* *key-l*
Move left / right by one character.
`j` `k` *key-j* *key-k*
Move down / up by one line.
`w` `W` *key-w* *key-W*
Move to the start of the next word. `w` stops at punctuation
boundaries, `W` only stops at whitespace.
`b` `B` *key-b* *key-B*
Move to the start of the previous word.
`e` `E` *key-e* *key-E*
Move to the end of the next word.
`ge` `gE` *key-ge* *key-gE*
Move to the end of the previous word.
`0` *key-0*
Move to the start of the line.
`^` *key-caret*
Move to the first non-whitespace character on the line.
`$` *key-dollar*
Move to the end of the line.
`g_` *key-g_*
Move to the last non-whitespace character on the line.
`gg` *key-gg*
Move to the first line of the buffer.
`G` *key-G*
Move to the last line of the buffer.
`|` *key-bar*
Move to a specific column. `10|` moves to column 10.
`%` *key-percent*
Jump to the matching bracket: `()`, `[]`, `{}`.
`](` `[(` *key-paren-nav*
Jump to the next / previous unmatched parenthesis.
`]}` `[{` *key-brace-nav*
Jump to the next / previous unmatched brace.
1.2 Character Search *char-search*
`f{char}` *key-f*
Move forward to the next occurrence of {char} on the current line.
`F{char}` *key-F*
Move backward to the previous occurrence of {char}.
`t{char}` *key-t*
Move forward to just before {char}.
`T{char}` *key-T*
Move backward to just after {char}.
`;` *key-semicolon*
Repeat the last `f`, `F`, `t`, or `T` in the same direction.
`,` *key-comma*
Repeat the last `f`, `F`, `t`, or `T` in the reverse direction.
1.3 Scrolling *scrolling*
`Ctrl+D` *key-ctrl-d*
In normal mode, scroll down half a screen. See |viewport|.
In insert mode, `Ctrl+D` clears the buffer if there is any content, and exits the shell if there is not.
`Ctrl+U` *key-ctrl-u*
Scroll up half a screen.
`Ctrl+G` *key-ctrl-g*
Print current cursor position (line, column, total lines).
1.4 Operators *operators*
Operators take a {motion} or |text-object| to define the range they
act on. Double an operator to act on the whole line (e.g. `dd`, `>>`,
`==`).
`d{motion}` *key-d*
Delete the text covered by {motion}.
`dd` delete the whole line
`D` delete to end of line (same as `d$`)
`x` delete character under cursor (same as `dl`)
`X` delete character before cursor (same as `dh`)
`c{motion}` *key-c*
Delete the text covered by {motion} and enter insert mode.
`cc` change the whole line
`C` change to end of line (same as `c$`)
`s` change the character under cursor (same as `cl`)
`S` change the whole line (same as `cc`)
`y{motion}` *key-y*
Yank (copy) the text covered by {motion} into a register.
`yy` yank the whole line
`Y` yank the whole line
`>{motion}` *key-indent*
Indent the lines covered by {motion}.
`>>` indent the current line
`<{motion}` *key-dedent*
Dedent the lines covered by {motion}.
`<<` dedent the current line
`={motion}` *key-equalize*
Auto-indent the lines covered by {motion}. Uses the minimum
nesting depth of each line's start and end to determine the
correct indentation level.
`==` equalize the current line
`g~{motion}` *key-toggle-case*
Toggle the case of the text covered by {motion}.
`gu{motion}` *key-gu*
Convert the text covered by {motion} to lowercase.
`gU{motion}` *key-gU*
Convert the text covered by {motion} to uppercase.
1.5 Single-Key Actions *normal-actions*
`p` *key-p*
Paste from the register after the cursor.
`P` *key-P*
Paste from the register before the cursor.
`r{char}` *key-r*
Replace the character under the cursor with {char}. With a count,
replaces that many characters.
`~` *key-tilde*
Toggle the case of the character under the cursor and advance.
Accepts a count.
`J` *key-J*
Join the current line with the next line.
`u` *key-u*
Undo the last change.
`Ctrl+R` *key-ctrl-r*
Redo the last undone change.
`.` *key-dot*
Repeat the last editing command.
`Ctrl+A` *key-ctrl-a*
Increment the number under the cursor. Recognizes decimal,
hexadecimal (`0x`), binary (`0b`), and octal (`0o`) formats.
Preserves leading zeros and prefix.
`Ctrl+X` *key-ctrl-x*
Decrement the number under the cursor.
1.6 Entering Other Modes *mode-entry*
`i` insert before cursor *key-i*
`a` insert after cursor *key-a*
`I` insert at first non-whitespace *key-I*
`A` insert at end of line *key-A*
`o` open a new line below *key-o*
`O` open a new line above *key-O*
`R` enter replace mode *key-R*
`v` enter visual mode (character-wise) *key-v*
`V` enter visual mode (line-wise) *key-V-visual*
`gv` reselect last visual region *key-gv*
`:` enter ex mode *key-colon*
1.7 Registers *registers*
`"{reg}` *key-register*
Use register {reg} for the next delete, yank, or put. Registers
`a`-`z` store text; uppercase `A`-`Z` appends to the corresponding
lowercase register.
==============================================================================
2. Insert Mode *insert-mode*
Insert mode is for typing text. Characters are inserted at the cursor.
`Esc` return to normal mode
`Backspace` delete character before cursor
`Ctrl+H` same as Backspace
`Ctrl+W` delete word before cursor
`Delete` delete character under cursor
`Tab` trigger completion (see |completion|)
`Shift+Tab` trigger completion (reverse direction)
`Ctrl+R` open history search (see |history-search|)
`Ctrl+V` enter verbatim mode (insert literal key sequence)
`Enter` submit line or insert newline if input is incomplete
Arrow keys, Home, and End work as expected for navigation.
==============================================================================
3. Visual Mode *visual-mode*
Visual mode selects a region of text. Enter with `v` (character-wise)
or `V` (line-wise) from normal mode.
All normal-mode motions work to extend the selection. Operators act
on the selected region without needing a motion:
`d` `x` delete selection
`c` `s` `S` change selection (delete and enter insert mode)
`y` yank selection
`p` `P` paste, replacing selection
`>` `<` indent / dedent selection
`=` equalize selection
`~` toggle case of selection
`u` lowercase selection
`U` uppercase selection
`r{char}` replace every character in selection with {char}
`J` join selected lines
`o` `O` swap cursor and selection anchor
Press `Esc` to return to normal mode without acting.
==============================================================================
4. Replace Mode *replace-mode*
Replace mode overwrites existing characters as you type. Enter with
`R` from normal mode.
`Esc` return to normal mode
`Backspace` undo the last replacement
All other keys replace the character under the cursor and advance.
==============================================================================
5. Ex Mode *ex-mode-keys*
Ex mode accepts colon commands. Enter with `:` from normal mode.
See |ex| for available commands.
`Enter` execute the command
`Esc` cancel and return to normal mode
`Ctrl+C` clear the command line
`Up` `Down` navigate ex command history
==============================================================================
6. Text Objects *text-objects*
Text objects define a range of text based on structure. They are used
with operators: `d`, `c`, `y`, etc. Each has an "inner" (`i`) and
"around" (`a`) variant.
`iw` `aw` *obj-word*
Word (punctuation-delimited). `aw` includes trailing whitespace.
`iW` `aW` *obj-WORD*
WORD (whitespace-delimited). `aW` includes trailing whitespace.
`i"` `a"` *obj-dquote*
Double-quoted string.
`i'` `a'` *obj-squote*
Single-quoted string.
`` i` `` `` a` `` *obj-backtick*
Backtick-quoted string.
`i)` `a)` `ib` `ab` *obj-paren*
Parenthesized block.
`i]` `a]` *obj-bracket*
Square-bracketed block.
`i}` `a}` `iB` `aB` *obj-brace*
Brace-delimited block.
`i<` `a<` *obj-angle*
Angle-bracketed block.
`it` `at` *obj-tag*
XML/HTML tag block.
`is` `as` *obj-sentence*
Sentence.
`ip` `ap` *obj-paragraph*
Paragraph (separated by blank lines).
==============================================================================
7. Counts *counts*
Most motions, operators, and actions accept a numeric count prefix:
`3j` move down 3 lines
`2dw` delete 2 words
`5>>` indent 5 lines
`10l` move 10 characters right
When both the operator and the motion have counts, they are
multiplied: `2d3w` deletes 6 words.
==============================================================================
8. Viewport *viewport*
When the buffer is taller than the terminal, the editor displays a
scrolling viewport. The viewport follows the cursor and respects the
`scrolloff` option (minimum lines visible above/below the cursor).
`Ctrl+D` scroll down half a screen
`Ctrl+U` scroll up half a screen
`Ctrl+G` display current position in the buffer
Line numbers in the left margin reflect actual buffer positions, not
viewport-relative indices.
==============================================================================
9. User-Defined Keymaps *keymaps* *keymap*
Custom key bindings are created with the `keymap` command:
`keymap [flags] {keys} {action}`
Flags select the mode(s) the binding applies to:
`-n` normal mode
`-i` insert mode
`-v` visual mode
`-x` ex mode
`-o` operator-pending mode
`-r` replace mode
Keys and actions use angle-bracket notation for special keys:
`<CR>` Enter `<Esc>` Escape
`<Tab>` Tab `<BS>` Backspace
`<Del>` Delete `<Space>` Space
`<Up>` `<Down>` `<Left>` `<Right>` Arrow keys
`<Home>` `<End>` Home / End
`<F1>` - `<F12>` Function keys
`<CMD>` Enter ex mode
`<Leader>` Leader key (set via `shopt prompt.leader`)
Modifier prefixes:
`C-` Control `A-` `M-` Alt / Meta
`S-` Shift
Examples:
`keymap -n <Leader>w ':w<CR>'` Leader+w writes to file
`keymap -i jk '<Esc>'` jk exits insert mode
`keymap -n <C-n> ':!mycmd<CR>'` Ctrl+n runs a shell command
To remove a binding:
`keymap --remove {keys}`
==============================================================================
10. Completion *completion*
`Tab` start or cycle through completion candidates (forward)
`Shift+Tab` cycle backward
When the completion menu is visible, `Tab` and arrow keys navigate
candidates. `Enter` accepts the selected candidate. `Esc` dismisses
the menu.
==============================================================================
11. History Search *history-search*
`Ctrl+R` open fuzzy history search (from insert or ex mode)
Type to filter history entries. `Enter` accepts the selected entry.
`Esc` dismisses the search.
==============================================================================
See also: |ex| |autocmd| |prompt|

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*prompt* *ps1* *psr* *prompt-expansion*
#PROMPT#
The shell displays a configurable prompt before each command. Two prompt
strings are available: PS1 (the main prompt) and PSR (an optional
right-aligned prompt).
==============================================================================
1. Setting the Prompt *prompt-set*
The prompt is controlled by the `PS1` and `PSR` environment variables.
Set them in your shell configuration:
`PS1='\u@\h:\W\$ '`
`PSR='$SHED_VI_MODE'`
Prompts are re-expanded before each display, so command substitutions
and functions are evaluated every time.
==============================================================================
2. Escape Sequences *prompt-escapes*
The following backslash escapes are recognized in PS1 and PSR:
`\u` *prompt-user*
The current username (from $USER).
`\h` *prompt-host*
The hostname (from $HOST).
`\w` *prompt-pwd*
The current working directory, with $HOME replaced by `~`.
Example:
`/home/user/projects` -> `~/projects`
`\W` *prompt-pwd-short*
Truncated working directory. Shows only the last N path segments,
where N is controlled by `shopt prompt.trunc_prompt_path`
(default: 4).
Example (with trunc_prompt_path=2):
`/home/user/projects/myapp` -> `projects/myapp`
`\s` *prompt-shell*
The shell name: `shed`.
`\$` *prompt-symbol*
`#` if the effective UID is 0 (root), `$` otherwise.
`\j` *prompt-jobs*
The number of background jobs currently managed by the shell.
`\t` *prompt-runtime-ms*
The runtime of the last command in milliseconds.
`\T` *prompt-runtime-fmt*
The runtime of the last command in human-readable format
(e.g. `1m 23s 456ms`).
`\n` *prompt-newline*
A literal newline. Use this to create multi-line prompts.
`\r` *prompt-return*
A literal carriage return.
`\\` *prompt-backslash*
A literal backslash.
`\e[...` *prompt-ansi*
An ANSI escape sequence. The sequence starts with `\e[` and ends
at the first letter character. Used for colors and formatting.
Common codes:
`\e[0m` reset all attributes
`\e[1m` bold
`\e[3m` italic
`\e[4m` underline
`\e[31m` red foreground
`\e[32m` green foreground
`\e[33m` yellow foreground
`\e[34m` blue foreground
`\e[35m` magenta foreground
`\e[36m` cyan foreground
`\e[1;32m` bold green
Example:
`PS1='\e[1;32m\u\e[0m@\e[34m\h\e[0m:\w\$ '`
==============================================================================
3. Functions in Prompts *prompt-functions*
`\@{funcname}` *prompt-func*
`\@funcname`
Call a shell function and insert its output. The function must
be defined before the prompt is expanded. If the function does
not exist, the literal sequence is displayed.
Example:
`git_branch() { git branch --show-current 2>/dev/null; }`
`PS1='\u@\h (\@git_branch)\$ '`
This allows dynamic prompt content that updates on every command.
==============================================================================
4. Right Prompt (PSR) *prompt-right* *psr*
The PSR variable defines an optional right-aligned prompt displayed
on the last line of PS1. It supports the same escape sequences as PS1.
PSR is only displayed when it fits: if the combined width of the
input line and PSR exceeds the terminal width, PSR is hidden.
PSR is restricted to a single line. If it contains newlines, only the
first line is used.
`PSR='$SHED_VI_MODE'`
`PSR='\T'` # show last command runtime on the right
==============================================================================
5. Multi-Line Prompts *prompt-multiline*
PS1 may span multiple lines using `\n`. The editor tracks line
positions for proper cursor movement and redrawing.
`PS1='\e[1m\u@\h\e[0m\n\W\$ '`
This displays the username and hostname on the first line, and the
working directory and prompt symbol on the second.
==============================================================================
6. echo -p *echo-prompt*
The `echo` builtin accepts a `-p` flag that enables prompt-style
expansion on its arguments. All prompt escape sequences listed above
are recognized.
`echo -p '\u'` # prints the current username
`echo -p '\W'` # prints the truncated working directory
`echo -p '\e[31mred\e[0m'` # prints "red" in red
The `-p` flag can be combined with `-n` (no trailing newline) and
`-e` (interpret escape sequences like `\n` and `\t`). When both `-e`
and `-p` are used, prompt expansion runs first, then escape sequence
interpretation.
==============================================================================
7. Prompt Options (shopt) *prompt-options*
The following options under `shopt prompt.*` affect prompt behavior:
`prompt.trunc_prompt_path` *opt-trunc-path*
Maximum number of path segments shown by `\W`. Default: 4.
`prompt.highlight` *opt-highlight*
Enable syntax highlighting in the input line. Default: true.
`prompt.auto_indent` *opt-auto-indent*
Automatically indent new lines to match the current nesting
depth. Default: true.
`prompt.linebreak_on_incomplete` *opt-linebreak*
Insert a newline when Enter is pressed on an incomplete command
(e.g. unclosed quotes or pipes). Default: true.
`prompt.line_numbers` *opt-line-numbers*
Display line numbers in the left margin for multi-line buffers.
Default: true.
`prompt.leader` *opt-leader*
The leader key sequence for |keymaps|. Default: `" "` (space).
`prompt.comp_limit` *opt-comp-limit*
Maximum number of completion candidates to display. Default: 100.
`prompt.completion_ignore_case` *opt-comp-case*
Case-insensitive tab completion. Default: false.
==============================================================================
8. Special Variables *prompt-variables*
`SHED_VI_MODE` *var-vi-mode*
Set automatically before each prompt to the current vi mode name:
`NORMAL`, `INSERT`, `VISUAL`, `COMMAND`, `REPLACE`, `SEARCH`, or
`COMPLETE`. Useful in PSR or prompt functions.
Example:
`PSR='$SHED_VI_MODE'`
==============================================================================
9. Remote Refresh (SIGUSR1) *prompt-sigusr1*
Sending `SIGUSR1` to the shell process causes it to re-expand and
redraw the prompt. This is useful for updating the prompt from
external processes (e.g. a background script that detects a state
change).
`kill -USR1 $$`
Combined with prompt functions (see |prompt-func|), this allows the
prompt to reflect changes that happen outside the shell's normal
command cycle.
==============================================================================
See also: |keybinds| |autocmd| |ex|