[features-] add command hide-uniform-cols

Author: midichef

visidata/features/layout.py

@@ -1,4 +1,4 @@
-from visidata import VisiData, vd, Column, Sheet, Fanout
+from visidata import VisiData, vd, Column, Sheet, Fanout, asyncthread
 
 @Column.api
 def setWidth(self, w):
@@ -35,22 +35,35 @@ def hide_col(vd, col):
     if not col: vd.fail("no columns to hide")
     col.hide()
 
+@Sheet.api
+@asyncthread
+def hide_uniform_cols(sheet):
+    if len(sheet.rows) < 2:
+        return
+    for col in sheet.visibleCols:
+        vals = (col.getTypedValue(r) for r in sheet.rows)
+        first = next(vals)
+        if all(v == first for v in vals):
+            col.hide()
+
 Sheet.addCommand('_', 'resize-col-max', 'if cursorCol: cursorCol.toggleWidth(cursorCol.getMaxWidth(visibleRows))', 'toggle width of current column between full and default width')
 Sheet.addCommand('z_', 'resize-col-input', 'width = int(input("set width= ", value=cursorCol.width)); cursorCol.setWidth(width)', 'adjust width of current column to N')
 Sheet.addCommand('g_', 'resize-cols-max', 'for c in visibleCols: c.setWidth(c.getMaxWidth(visibleRows))', 'toggle widths of all visible columns between full and default width')
 Sheet.addCommand('gz_', 'resize-cols-input', 'width = int(input("set width= ", value=cursorCol.width)); Fanout(visibleCols).setWidth(width)', 'adjust widths of all visible columns to N')
 
 Sheet.addCommand('-', 'hide-col', 'hide_col(cursorCol)', 'hide the current column')
 Sheet.addCommand('z-', 'resize-col-half', 'cursorCol.setWidth(cursorCol.width//2)', 'reduce width of current column by half')
+Sheet.addCommand(None, 'hide-uniform-cols', 'sheet.hide_uniform_cols()', 'hide any column that has multiple rows but only one distinct value')
 
 Sheet.addCommand('gv', 'unhide-cols', 'unhide_cols(columns, visibleRows)', 'unhide all hidden columns on current sheet')
 Sheet.addCommand('v', 'toggle-multiline', 'for c in visibleCols: c.toggleMultiline()', 'toggle multiline display')
 Sheet.addCommand('zv', 'resize-height-input', 'Fanout(visibleCols).height=int(input("set height for all columns to: ", value=max(c.height for c in sheet.visibleCols)))', 'resize row height to N')
 Sheet.addCommand('gzv', 'resize-height-max', 'h=calc_height(cursorRow, {}, maxheight=windowHeight-1); vd.status(f"set height for all columns to {h}"); Fanout(visibleCols).height=h', 'resize row height to max height needed to see this row')
 
 vd.addMenuItems('''
-    Column > Hide > hide-col
-    Column > Unhide all > unhide-cols
+    Column > Hide > Hide > hide-col
+    Column > Hide > Hide uniform > hide-uniform-cols
+    Column > Hide > Unhide all > unhide-cols
     Column > Resize > half width > resize-col-half
     Column > Resize > current column width to max > resize-col-max
     Column > Resize > current column width to N > resize-col-input