Improve PATH warning with shell-specific permanent fix

Detects user shell, prints single copy-pasteable command that
appends to rc file + reloads config.

Author: rmorse

install.sh

@@ -67,9 +67,22 @@ echo "Installed ${BINARY} and ghapp-gh to ${INSTALL_DIR}"
 
 case ":$PATH:" in
   *":$INSTALL_DIR:"*) ;;
-  *) echo ""
-     echo "WARNING: $INSTALL_DIR is not in your PATH. Add it with:"
-     echo "  export PATH=\"$INSTALL_DIR:\$PATH\""
-     echo "Then add that line to your ~/.bashrc or ~/.zshrc to make it permanent."
-     ;;
+  *)
+    # Detect user's shell rc file
+    case "$(basename "$SHELL")" in
+      zsh)  RC_FILE="$HOME/.zshrc" ;;
+      fish) RC_FILE="$HOME/.config/fish/config.fish" ;;
+      *)    RC_FILE="$HOME/.bashrc" ;;
+    esac
+    echo ""
+    echo "WARNING: $INSTALL_DIR is not in your PATH. Run:"
+    case "$(basename "$SHELL")" in
+      fish)
+        echo "  echo 'fish_add_path $INSTALL_DIR' >> $RC_FILE && source $RC_FILE"
+        ;;
+      *)
+        echo "  echo 'export PATH=\"\$HOME/.local/bin:\$PATH\"' >> $RC_FILE && source $RC_FILE"
+        ;;
+    esac
+    ;;
 esac