fix: Fixed a bug where filterchains wouldn't append properly.

ffmpeg.nu

@@ -33,18 +33,24 @@ export def "run" [
   }
 }
 
+def "append last" [
+  items: list
+]: list -> list {
+  let list = $in;
+
+  ($list | range 0..-2) | append [($list | default [] | last | append $items)]
+}
+
 export def "cmd filters append" [
-  complex_filter: list<record>
+  complex_filters: list<record>
 ]: record -> record {
   update filters { |cmd|
     let filters = $in;
 
     if ($cmd.options.chain_filters) {
-      (($filters | range 0..-2) | append [
+      $filters | append last $complex_filters
-        (($filters | default [] | last) | append $complex_filter)
-      ])
     } else {
-      $filters | append [$complex_filter]
+      $filters | append [$complex_filters]
     }
   }
 }
@@ -99,7 +105,21 @@ export def filterchain [
   let original_option = $cmd.options.chain_filters;
 
   # TODO: Assign inputs and outputs
-  $cmd | update options.chain_filters { not $in } | do $filter | update options.chain_filters $original_option;
+  (
+    $cmd
+    | update options.chain_filters { not $in }
+    | update filters {
+      let it = $in;
+
+      if ($it | describe | str starts-with 'table') {
+        [$it [] ]
+      } else {
+        $it | append [[]]
+      }
+    }
+    | do $filter
+    | update options.chain_filters $original_option
+  );
 }
 
 # Build a record representaion of a complex filter

ffmpeg_test.nu

@@ -176,3 +176,54 @@ def filterchain_concats_filters [] {
         options: { chain_filters: false }
       };
 }
+
+#[test]
+def filterchain_appends_current_filter [] {
+    let got = (cmd ['INPUT'] ['OUTPUT'] | fps 12 | filterchain { fps 25 -i ['in'] | loop 2 1 -o ['out']});
+
+    assert equal $got {
+        input: ['INPUT']
+        filters: [
+          [
+            {
+              input: []
+              name: 'fps'
+              params: [
+                {param: 'fps' value: '12'}
+              ]
+              output: []
+            }
+          ]
+          [
+            {
+              input: ['in']
+              name: 'fps'
+              params: [
+                {param: 'fps' value: '25'}
+              ]
+              output: []
+            }
+            #{
+            #  input: []
+            #  name: 'settb'
+            #  params: [
+            #    {param: 'expr' value: '1/25'}
+            #  ]
+            #  output: []
+            #}
+            {
+              input: []
+              name: 'loop'
+              params: [
+                {param: 'loop' value: 2}
+                {param: 'size' value: 1}
+              ]
+              output: ['out']
+            }
+          ]
+        ]
+        output: ['OUTPUT']
+        args: []
+        options: { chain_filters: false }
+      };
+}