zsh-autosuggestions

zsh-autosuggestions is a plugin for the Z shell that displays a suggested completion after the cursor as you type a command. The suggestion appears in muted gray by default (fg=8) and is based on command history and completions, similar to the autosuggestion behavior in Fish. It requires Zsh v4.3.11 or later.

Pressing the right arrow (forward-char) or End (end-of-line) with the cursor at the end of the buffer accepts the suggestion. Invoking forward-word accepts it partially, up to where the cursor moves. Suggestions are generated by a configurable ZSH_AUTOSUGGEST_STRATEGY array, whose entries are tried in order until one returns a match. The built-in strategies are history (most recent match), completion (what tab-completion would suggest, using the zpty module), and match_prev_cmd (the most recent history match whose preceding entry matches the last executed command).

Behavior is controlled through environment variables. You can change the highlight style with ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE, and cap buffer size with ZSH_AUTOSUGGEST_BUFFER_MAX_SIZE. ZSH_AUTOSUGGEST_HISTORY_IGNORE and ZSH_AUTOSUGGEST_COMPLETION_IGNORE take glob patterns to filter out suggestions. Zle widget behavior is remapped through the ZSH_AUTOSUGGEST_*_WIDGETS arrays (clear, accept, execute, partial accept, ignore). Suggestions are fetched asynchronously by default on zsh 5.0.8 and later. Automatic widget re-binding can be turned off with ZSH_AUTOSUGGEST_MANUAL_REBIND for better performance.

The plugin also provides widgets for bindkey: autosuggest-accept, autosuggest-execute, autosuggest-clear, autosuggest-fetch, autosuggest-disable, autosuggest-enable, and autosuggest-toggle. It is aimed at zsh users who want history-based completion on the command line, including Oh My Zsh users, who can put the configuration in $ZSH_CUSTOM.