Dynamic completion to use same binary as main call

The binary of Helm to use for dynamic completion should be the same
as the actual Helm binary being used.  For example, if PATH points
to a version of helm v2, but the user calls bin/helm to use a local
v3 version, then dynamic completion should also use bin/helm.
If not, in this example, the dynamic completion will use the
information returned by helm v2.

This improvement is particularly useful for users that will run both
helm v2 and helm v3 at the same time.

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

cmd/helm/root.go

@@ -91,30 +91,49 @@ __helm_get_namespaces()
 
 __helm_list_releases()
 {
-	__helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
-	local out filter
-	# Use ^ to map from the start of the release name
-	filter="^${words[c]}"
-    if out=$(helm list $(__helm_override_flags) -a -q -m 1000 -f ${filter} 2>/dev/null); then
+    __helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    local out filter helm_binary
+
+    # Use ^ to map from the start of the release name
+    filter="^${words[c]}"
+
+    helm_binary="${words[0]}"
+    __helm_debug "${FUNCNAME[0]}: helm_binary is ${helm_binary}"
+
+    # Use eval in case helm_binary or __helm_override_flags contains a variable (e.g., $HOME/bin/h3)
+    if out=$(eval ${helm_binary} list $(__helm_override_flags) -a -q -m 1000 -f ${filter} 2>/dev/null); then
         COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
     fi
 }
+
 __helm_list_repos()
 {
     __helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
-    local out
-    if out=$(helm repo list 2>/dev/null | tail +2 | cut -f1); then
+    local out helm_binary
+
+    helm_binary="${words[0]}"
+    __helm_debug "${FUNCNAME[0]}: helm_binary is ${helm_binary}"
+
+    # Use eval in case helm_binary contains a variable (e.g., $HOME/bin/h3)
+    if out=$(eval ${helm_binary} repo list 2>/dev/null | tail +2 | cut -f1); then
         COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
     fi
 }
+
 __helm_list_plugins()
 {
     __helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
-    local out
-    if out=$(helm plugin list 2>/dev/null | tail +2 | cut -f1); then
+    local out helm_binary
+
+    helm_binary="${words[0]}"
+    __helm_debug "${FUNCNAME[0]}: helm_binary is ${helm_binary}"
+
+    # Use eval in case helm_binary contains a variable (e.g., $HOME/bin/h3)
+    if out=$(eval ${helm_binary} plugin list 2>/dev/null | tail +2 | cut -f1); then
         COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
     fi
 }
+
 __helm_custom_func()
 {
 	__helm_debug "${FUNCNAME[0]}: last_command is $last_command"