refactor(lib): enhance pick_from_headers to display full commit messages with fzf preview

Modified pick_from_headers function to prerender full commit messages (header, body, footer) into a temporary file and integrate with fzf's preview window.
This allows users to see detailed message contents before selecting.

Author: codevogel

src/lib/pick_from_headers.sh

@@ -1,16 +1,44 @@
 pick_from_headers() {
   local -n headers_ref=$1
+  local response="$2"
 
   # Quit if no headers are provided
   if [[ ${#headers_ref[@]} -eq 0 ]]; then
     echo "No headers available to pick from. Maybe the AI response is empty or incorrectly formatted? You can test this by running the command again with the -r flag." >&2
     return 1
   fi
 
-  selected_line=$(printf '%s\n' "${headers_ref[@]}" | sort -rn | fzf --ansi --prompt="Select commit message: " --preview "echo {}")
+  # Prerender all full messages to a temp file
+  local temp_file=$(mktemp)
+  local count=1 # Start at 1 to match nl numbering
+  while IFS= read -r header; do
+    local header_only="${header#* }" # Remove score prefix
+    echo "=== MESSAGE $count ===" >>"$temp_file"
+    echo "$response" | yq eval ".commitMessages[] | select(.header==\"$header_only\") | .header" - >>"$temp_file"
+    local body=$(echo "$response" | yq eval ".commitMessages[] | select(.header==\"$header_only\") | .body // \"\"" -)
+    local footer=$(echo "$response" | yq eval ".commitMessages[] | select(.header==\"$header_only\") | .footer // \"\"" -)
+    [[ -n "$body" && "$body" != "null" ]] && echo "" >>"$temp_file" && echo "$body" >>"$temp_file"
+    [[ -n "$footer" && "$footer" != "null" ]] && echo "" >>"$temp_file" && echo "$footer" >>"$temp_file"
+    echo "" >>"$temp_file"
+    ((count++))
+  done < <(printf '%s\n' "${headers_ref[@]}" | sort -rn)
+
+  # Add a final marker to ensure the last message is captured correctly
+  echo "=== END ===" >>"$temp_file"
+
+  selected_line=$(printf '%s\n' "${headers_ref[@]}" | sort -rn | nl -w1 -s' ' | fzf --ansi \
+    --prompt="Select commit message: " \
+    --preview "sed -n '/=== MESSAGE {1} ===/,/=== MESSAGE/p' '$temp_file' | head -n -1 | tail -n +2" \
+    --preview-window=wrap)
+
+  local exit_code=$?
+  rm -f "$temp_file"
+
   [[ -z "$selected_line" ]] && {
     echo "No selection, aborting." >&2
     return 1
   }
-  echo "${selected_line#* }"
+
+  # Remove the line number and score prefix
+  echo "${selected_line#* }" | sed 's/^[0-9]* //'
 }

src/root_command.sh

@@ -45,7 +45,7 @@ print_if_not_silent "AI response received. Presenting options for selection..."
 
 # Parse AI response and let user select a commit message
 mapfile -t headers < <(extract_headers_from_response "$response")
-selected_header="$(pick_from_headers headers)"
+selected_header="$(pick_from_headers headers "$response")"
 selected_entry="$(select_entry "$selected_header" "$response")"
 
 # Build the commit message and open it in the user's editor for review/editing