flailing about with MOPs

1 files changed, 63 insertions, 0 deletions

diff --git a/bos-namespaces.sh b/bos-namespaces.sh
new file mode 100644
index 0000000..3e9e711
--- /dev/null
+++ b/bos-namespaces.sh
@@ -0,0 +1,63 @@
+#!bash
+## namespace handling
+
+function bos-namespaces/store-for-into() {
+    local name="bos_namespaces__${2//[^[:word:]/__}__${1//[^[:word:]]/__}"
+    local -n result="$2"
+    declare -gA "$name"
+    result="$name"
+}
+
+# save all currently-visible functions in an associative array
+function bos-namespaces/start() {
+    local namespace="$1";shift
+    local ns_store; bos-namespaces/store-for-into saved_funcs "$namespace" ns_store
+    local -n saved_funcs="$ns_store"
+    local _ funcname
+
+    while read -r _ _ funcname; do
+        saved_funcs+=( ["$funcname"]="$(declare -pf "$funcname")" )
+    done < <( declare -pF )
+
+    return 0
+}
+
+# diff all currently-visible function against the saved ones, list the
+# ones that differ
+function bos-namespaces/list-new-funcs-into() {
+    local namespace="$1";shift
+    local -n result="$1"
+    local ns_store; bos-namespaces/store-for-into saved_funcs "$namespace" ns_store
+    local -n saved_funcs="$ns_store"
+    local _ funcname new_function
+
+    while read -r _ _ funcname; do
+        new_function="$(declare -pf "$funcname")"
+        if [[ "$new_function" != "${saved_funcs["$funcname"]}" ]]; then
+            result+=( "${funcname}" )
+        fi
+    done < <( declare -pF )
+
+    return 0
+}
+
+# rename a bunch of functions by prepending a prefix; restore the
+# saved function of the same name, if it exists
+function bos-namespaces/qualify-funcs() {
+    local namespace="$1";shift
+    local ns_store; bos-namespaces/store-for-into saved_funcs "$namespace" ns_store
+    local -n saved_funcs="$ns_store"
+    local _ funcname new_function
+
+    for funcname in "$@"; do
+        new_function="$(declare -pf "$funcname")"
+        eval "${namespace}/${new_function}"
+        if [[ -n "${saved_funcs["$funcname"]}" ]]; then
+            eval "${saved_funcs["$funcname"]}"
+        else
+            unset -f "$funcname"
+        fi
+    done
+
+    return 0
+}