Fix index chaining; tests passing

example_output

@@ -52,7 +52,9 @@ Removed ./people/:state:id/WA/1
 + cargo run --quiet -- del -v ./people:id 3
 Removed ./people:id/3
 Removed ./people/Janella
+Removed ./people/:state:id/FL/3
 + cargo run --quiet -- del -v ./people/:state:id CA 0
+Removed ./people:id/0
 Removed ./people/Wulfrum
 Removed ./people/:state:id/CA/0
 + cargo run --quiet -- get -a -w state=CA -f name ./people/:state:id

src/cmd/idx.rs

@@ -9,7 +9,7 @@ use std::path::Path;
 
 use walkdir::WalkDir;
 
-use crate::declare_indices;
+use crate::declare_closure_indices;
 use crate::parser::xattr::Xattr;
 use crate::paths::sub_idx_path;
 
@@ -38,8 +38,14 @@ pub enum IdxErr {
     },
 }
 
-/// Create a new index of the data in `src`, locating the index in `dest`.
-/// The new index uses `keys` as its primary key
+/**
+ * Create a new index of the data in `src`, locating the index in `dest`, or a subdirectory of `src` by default.
+ *
+ * The new index uses `keys` as its primary key.
+ *
+ * `dest` will have `src` and all _its_ related indices as related indices; and `src` and all its related indices
+ * will be updated to include `dest` as an alternate index.
+ */
 pub fn idx(src: &PathBuf, dest: Option<&PathBuf>, keys: &Key, verbose: bool) -> Result<()> {
     if keys.is_empty() {
         panic!("No keys were provided to index by");
@@ -95,7 +101,7 @@ pub fn idx(src: &PathBuf, dest: Option<&PathBuf>, keys: &Key, verbose: bool) ->
 
     init(&dest, &keys, false)?;
 
-    declare_indices(src, &dest)
+    declare_closure_indices(src, &dest)
 }
 
 #[cfg(test)]

src/lib.rs

@@ -389,6 +389,23 @@ pub fn declare_indices<P1: AsRef<Path>, P2: AsRef<Path>>(dir1: P1, dir2: P2) ->
     index_list_push(dir2, dir1)
 }
 
+/// Mark `dir1`, `dir2`, the indices of `dir1`, and the indices of `dir2`
+/// all as indices of each other.
+pub fn declare_closure_indices<P1: AsRef<Path>, P2: AsRef<Path>>(dir1: P1, dir2: P2) -> Result<()> {
+    let info1 = table_info(&dir1)?
+        .ok_or_else(|| IndexListPushErr::TargetTableInfoNotFound(dir1.as_ref().into()))?;
+    let info2 = table_info(&dir2)?
+        .ok_or_else(|| IndexListPushErr::TargetTableInfoNotFound(dir2.as_ref().into()))?;
+
+    for path1 in info1.indices.values() {
+        for path2 in info2.indices.values() {
+            declare_indices(path1, path2)?;
+        }
+    }
+
+    Ok(())
+}
+
 #[cfg(test)]
 mod test {
     use std::{