rename-elixir-project.sh

#!/bin/sh
set -eu

# --- Helper: Convert snake_case to PascalCase ---
snake_to_pascal() {
  echo "$1" | awk -F_ '{
    for (i = 1; i <= NF; i++) {
      $i = toupper(substr($i, 1, 1)) substr($i, 2)
    }
    print $0
  }' OFS=""
}

# --- Validate and normalize root directory ---
if [ "$#" -lt 1 ]; then
  echo "Usage: $0 <project_root_directory>" >&2
  exit 1
fi

# Expand path to absolute
PROJECT_ROOT=$(cd "$1" 2>/dev/null && pwd)
if [ ! -d "$PROJECT_ROOT" ]; then
  echo "Error: '$1' is not a valid directory." >&2
  exit 1
fi

cd "$PROJECT_ROOT"
ROOT_NAME=$(basename "$PROJECT_ROOT")

# --- Prompt for inputs with gum ---
OLD_SNAKE=$(gum input --prompt "Old project name: " --value "$ROOT_NAME")
OLD_PASCAL=$(gum input --prompt "Old module name: " --value "$(snake_to_pascal "$OLD_SNAKE")")
NEW_SNAKE=$(gum input --prompt "New project name: ")
NEW_PASCAL=$(gum input --prompt "New module name: " --value "$(snake_to_pascal "$NEW_SNAKE")")

# --- Confirm renaming ---
if ! gum confirm "Rename $OLD_SNAKE / $OLD_PASCAL to $NEW_SNAKE / $NEW_PASCAL?"; then
  exit 1
fi

# --- Ask whether to include .git folder ---
RENAME_GIT="yes"
if gum confirm "Also rename inside the .git folder?" --default=true; then
  RENAME_GIT="yes"
else
  RENAME_GIT="no"
fi

# --- Construct ripgrep ignore flags ---
RG_IGNORE="
  --glob=!_build/**
  --glob=!deps/**
  --glob=!.elixir_ls/**
  --glob=!node_modules/**
"

if [ "$RENAME_GIT" = "no" ]; then
  RG_IGNORE="$RG_IGNORE --glob=!.git/**"
fi

# --- Replace file contents ---
echo "Updating file contents..."
# shellcheck disable=SC2086
eval rg --files --hidden $RG_IGNORE | while IFS= read -r file; do
    sed -i "s/$OLD_SNAKE/$NEW_SNAKE/g" "$file"
    sed -i "s/$OLD_PASCAL/$NEW_PASCAL/g" "$file"
done

# --- Rename files and directories ---
echo "Renaming files and directories..."
# shellcheck disable=SC2010
find . -depth \
  \( -path "./_build" -o -path "./deps" -o -path "./.elixir_ls" -o -path "./node_modules" \
     $( [ "$RENAME_GIT" = "no" ] && printf '%s' '-o -path "./.git"' ) \
  \) -prune -o -print | while IFS= read -r path; do
  base_name=$(basename "$path")
  dir_name=$(dirname "$path")

  new_base_name=$(echo "$base_name" | sed "s/$OLD_SNAKE/$NEW_SNAKE/g" | sed "s/$OLD_PASCAL/$NEW_PASCAL/g")
  if [ "$new_base_name" != "$base_name" ]; then
    mv "$path" "$dir_name/$new_base_name"
  fi
done

# --- Rename the root directory ---
cd ..
NEW_ROOT=$(echo "$ROOT_NAME" | sed "s/$OLD_SNAKE/$NEW_SNAKE/g" | sed "s/$OLD_PASCAL/$NEW_PASCAL/g")
mv "$PROJECT_ROOT" "$NEW_ROOT"
cd "$NEW_ROOT"
exec "$SHELL"

# --- Run post-commands (safe to fail) ---
direnv allow 2>/dev/null || true
mise trust 2>/dev/null || true