lh5concat: allow concatenating of group-like structs

src/lgdo/cli.py

@@ -7,7 +7,7 @@
 import logging
 import sys
 
-from . import Array, Table, VectorOfVectors, __version__, lh5
+from . import Array, Scalar, Struct, Table, VectorOfVectors, __version__, lh5
 from . import logging as lgdogging  # eheheh
 
 log = logging.getLogger(__name__)
@@ -212,6 +212,7 @@ def lh5concat(args=None):
     store = lh5.LH5Store()
     h5f0 = store.gimme_file(file0)
     lgdos = {}
+    lgdo_structs = {}
     # loop over object list in the first file
     for name in obj_list:
         # now loop over groups starting from root
@@ -222,7 +223,7 @@ def lh5concat(args=None):
             if current in lgdos:
                 break
 
-            # not even an LGDO!
+            # not even an LGDO (i.e. a plain HDF5 group)!
             if "datatype" not in h5f0[current].attrs:
                 continue
 
@@ -232,14 +233,30 @@ def lh5concat(args=None):
                 # read all!
                 obj, _ = store.read(current, h5f0)
                 lgdos[current] = obj
+            elif isinstance(obj, Struct):
+                # structs might be used in a "group-like" fashion (i.e. they might only
+                # contain array-like objects).
+                # note: handle after handling tables, as tables also satisfy this check.
+                lgdo_structs[current] = obj.attrs["datatype"]
+                continue
+            elif isinstance(obj, Scalar):
+                msg = f"cannot concat scalar field {current}"
+                log.warning(msg)
 
             break
 
     msg = f"first-level, array-like objects: {lgdos.keys()}"
     log.debug(msg)
+    msg = f"nested structs: {lgdo_structs.keys()}"
+    log.debug(msg)
 
     h5f0.close()
 
+    if lgdos == {}:
+        msg = "did not find any field to concatenate, exit"
+        log.error(msg)
+        return
+
     # 2. remove (nested) table fields based on obj_list
 
     def _inplace_table_filter(name, table, obj_list):
@@ -298,3 +315,14 @@ def _inplace_table_filter(name, table, obj_list):
                 _inplace_table_filter(name, obj, obj_list)
 
             store.write(obj, name, args.output, wo_mode="append")
+
+    # 5. reset datatypes of the "group-like" structs
+
+    if lgdo_structs != {}:
+        output_file = store.gimme_file(args.output, mode="a")
+        for struct, struct_dtype in lgdo_structs.items():
+            msg = f"reset datatype of struct {struct} to {struct_dtype}"
+            log.debug(msg)
+
+            output_file[struct].attrs["datatype"] = struct_dtype
+        output_file.close()

tests/test_cli.py

@@ -149,3 +149,21 @@ def test_lh5concat(lgnd_test_data, tmptestdir):
         assert tbl.packet_id[i] == tbl2.packet_id[i - 10]
         assert np.array_equal(tbl.tracelist[i], tbl2.tracelist[i - 10])
         assert np.array_equal(tbl.waveform.values[i], tbl2.waveform.values[i - 10])
+
+    # test concatenating arrays in structs.
+    infile1 = f"{tmptestdir}/concat_test_struct_0.lh5"
+    tb1 = types.Table(col_dict={"col": types.Array(np.zeros(4))})
+    struct1 = types.Struct({"x": tb1})
+    store.write(struct1, "stp", infile1, wo_mode="overwrite_file")
+
+    infile2 = f"{tmptestdir}/concat_test_struct_1.lh5"
+    tb2 = types.Table(col_dict={"col": types.Array(np.ones(7))})
+    struct2 = types.Struct({"x": tb2})
+    store.write(struct2, "stp", infile2, wo_mode="overwrite_file")
+
+    outfile = f"{tmptestdir}/concat_test_struct_out.lh5"
+    cli.lh5concat(["--output", outfile, "--", infile1, infile2])
+
+    out_stp = store.read("stp", outfile)[0]
+    assert out_stp.attrs["datatype"] == "struct{x}"
+    assert np.all(out_stp.x["col"].nda == np.array([0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1]))