Replace path-based fileinput with an upload button

pyzebra/app/app.py

@@ -10,17 +10,13 @@ parser = argparse.ArgumentParser(
     prog="pyzebra", formatter_class=argparse.ArgumentDefaultsHelpFormatter
 )
 
-parser.add_argument(
-    "--init-meta", metavar="PATH", type=str, default="", help="initial path to .cami file",
-)
-
 args = parser.parse_args()
 
 doc = curdoc()
 doc.title = "pyzebra"
 
 # Final layout
-tab_data_viewer = panel_data_viewer.create(args.init_meta)
+tab_data_viewer = panel_data_viewer.create()
 tab_anatric = panel_anatric.create()
 
 doc.add_root(Tabs(tabs=[tab_data_viewer, tab_anatric]))

pyzebra/app/panel_data_viewer.py

@@ -1,3 +1,6 @@
+import base64
+import io
+
 import numpy as np
 from bokeh.layouts import column, gridplot, row
 from bokeh.models import (
@@ -7,6 +10,8 @@ from bokeh.models import (
     Button,
     ColumnDataSource,
     DataRange1d,
+    Div,
+    FileInput,
     Grid,
     HoverTool,
     Image,
@@ -23,7 +28,6 @@ from bokeh.models import (
     Select,
     Spinner,
     TextAreaInput,
-    TextInput,
     Title,
     Toggle,
     WheelZoomTool,
@@ -36,12 +40,24 @@ IMAGE_W = 256
 IMAGE_H = 128
 
 
-def create(init_meta):
+def create():
     curent_h5_data = np.array([])
     current_index = None
     det_data = {}
     roi_selection = {}
 
+    upload_div = Div(text="Open .cami file:")
+
+    def upload_button_callback(_attr, _old, new):
+        with io.StringIO(base64.b64decode(new).decode()) as file:
+            h5meta_list = pyzebra.parse_h5meta(file)
+            file_list = h5meta_list["filelist"]
+            filelist.options = file_list
+            filelist.value = file_list[0]
+
+    upload_button = FileInput(accept=".cami")
+    upload_button.on_change("value", upload_button_callback)
+
     def update_image():
         current_image = curent_h5_data[current_index]
         proj_v_line_source.data.update(
@@ -79,12 +95,8 @@ def create(init_meta):
         overview_x = np.mean(data, axis=1)
         overview_y = np.mean(data, axis=2)
 
-        overview_plot_x_image_source.data.update(
+        overview_plot_x_image_source.data.update(image=[overview_x], dw=[overview_x.shape[1]])
-            image=[overview_x], dw=[overview_x.shape[1]]
+        overview_plot_y_image_source.data.update(image=[overview_y], dw=[overview_y.shape[1]])
-        )
-        overview_plot_y_image_source.data.update(
-            image=[overview_y], dw=[overview_y.shape[1]]
-        )
 
         if frame_button_group.active == 0:  # Frame
             overview_plot_x_image_source.data.update(
@@ -105,15 +117,6 @@ def create(init_meta):
     filelist = Select()
     filelist.on_change("value", filelist_callback)
 
-    def fileinput_callback(_attr, _old, new):
-        h5meta_list = pyzebra.read_h5meta(new)
-        file_list = h5meta_list["filelist"]
-        filelist.options = file_list
-        filelist.value = file_list[0]
-
-    fileinput = TextInput()
-    fileinput.on_change("value", fileinput_callback)
-
     def index_spinner_callback(_attr, _old, new):
         nonlocal current_index
         if 0 <= new < curent_h5_data.shape[0]:
@@ -488,14 +491,16 @@ def create(init_meta):
     )
 
     tab_layout = row(
-        column(fileinput, filelist, layout_image, row(colormap_layout, animate_layout, hkl_layout)),
+        column(
+            upload_div,
+            upload_button,
+            filelist,
+            layout_image,
+            row(colormap_layout, animate_layout, hkl_layout),
+        ),
         column(roi_avg_plot, layout_overview, row(selection_button, selection_list),),
     )
 
-    # initiate fileinput
-    if init_meta:
-        fileinput.value = init_meta
-
     return Panel(child=tab_layout, title="Data Viewer")
 
 

pyzebra/h5.py

@@ -2,7 +2,7 @@ import h5py
 
 
 def read_h5meta(filepath):
-    """Read and parse content of a h5meta file.
+    """Open and parse content of a h5meta file.
 
     Args:
         filepath (str): File path of a h5meta file.
@@ -10,22 +10,28 @@ def read_h5meta(filepath):
     Returns:
         dict: A dictionary with section names and their content.
     """
-    h5meta_content = dict()
+    with open(filepath) as file:
-    with open(filepath) as h5meta_file:
+        content = parse_h5meta(file)
-        section = None
-        for line in h5meta_file:
-            line = line.strip()
-            if line.startswith("#begin "):
-                section = line[len("#begin "):]
-                h5meta_content[section] = []
 
-            elif line.startswith("#end"):
+    return content
-                section = None
 
-            elif section:
-                h5meta_content[section].append(line)
 
-    return h5meta_content
+def parse_h5meta(file):
+    content = dict()
+    section = None
+    for line in file:
+        line = line.strip()
+        if line.startswith("#begin "):
+            section = line[len("#begin "):]
+            content[section] = []
+
+        elif line.startswith("#end"):
+            section = None
+
+        elif section:
+            content[section].append(line)
+
+    return content
 
 
 def read_detector_data(filepath):