ZSH widget: Add partial word accept (Ctrl+Right)

[noahgift]

Feature Request

Add ability to accept just the next word of a suggestion, not the entire thing.

Current Behavior

Suggestion: git commit -m "fix bug"
Buffer: git

Pressing Tab/Right accepts entire suggestion → git commit -m "fix bug"

Desired Behavior

• Tab / Right arrow: Accept full suggestion (current)
• Ctrl+Right: Accept next word only

Example:

1. Buffer: git | Suggestion: commit -m "fix bug"
2. Press Ctrl+Right → Buffer: git commit | Suggestion: -m "fix bug"
3. Press Ctrl+Right → Buffer: git commit -m | Suggestion: "fix bug"

Implementation

_aprender_accept_word() {
    if [[ -n "$POSTDISPLAY" ]]; then
        local suggestion="${POSTDISPLAY# }"
        local next_word="${suggestion%% *}"
        
        BUFFER="${BUFFER}${next_word} "
        CURSOR=${#BUFFER}
        
        # Update POSTDISPLAY with remainder
        local remainder="${suggestion#$next_word}"
        remainder="${remainder# }"
        if [[ -n "$remainder" ]]; then
            POSTDISPLAY=" $remainder"
            region_highlight=("${#BUFFER} $((${#BUFFER} + ${#POSTDISPLAY})) fg=8")
        else
            POSTDISPLAY=""
            region_highlight=()
        fi
        zle redisplay
    else
        zle forward-word
    fi
}

zle -N _aprender_accept_word
bindkey '^[[1;5C' _aprender_accept_word  # Ctrl+Right

Prior Art

• Fish shell: Alt+Right accepts next word
• zsh-autosuggestions: Ctrl+Right for partial accept
• GitHub Copilot CLI: Word-by-word accept

Related

• Part of ZSH widget improvements (ZSH widget: Add toggle, fix keybindings, add timeout for robustness #83)

[noahgift]

Implemented partial word accept:

New keybinding:

• Ctrl+Right (^[[1;5C): Accept next word only

Example flow:

1. Buffer: git | Suggestion: commit -m "fix"
2. Ctrl+Right → Buffer: git commit | Suggestion: -m "fix"
3. Ctrl+Right → Buffer: git commit -m | Suggestion: "fix"

Implementation:

_aprender_accept_word() {
    # Extract next word, update BUFFER and POSTDISPLAY
    local next_word="${clean_suffix%% *}"
    BUFFER="${BUFFER}${next_word} "
    ...
}
bindkey '^[[1;5C' _aprender_accept_word

168 tests pass.

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