"if" example

COMMAND-Conditional.md

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+**TODO** clean this up, for now collect snippets
+
+There are the `if` and `branch` commands to implement conditional execution of other commands. The difference is that `if` takes an expression for the condition, while `branch` takes a command name (and evaluates it).
+
+The following example shows a method definition, using `if` with `(…)` syntax for its arguments:
+
+```ini
+# COMMAND: Return path to item data (never empty, unlike `d.base_path`)
+method.insert = d.data_path, simple,\
+    "if=(d.is_multi_file), (cat, (d.directory)), (cat, (d.directory), /, (d.name))"
+```