Adding column_date_formats config option

Allows per-column formatting for date, time, datetime like columns

AUTHORS

@@ -138,6 +138,7 @@ Contributors:
     * Mathieu Dupuy (deronnax)
     * Chris Novakovic
     * Josh Lynch (josh-lynch)
+    * Doug Harris (dougharris)
 
 Creator:
 --------

changelog.rst

@@ -5,6 +5,7 @@ Features
 --------
 * Add a `--ping` command line option; allows pgcli to replace `pg_isready`
 * Changed the packaging metadata from setup.py to pyproject.toml
+* Added support for per-column date/time formatting using `column_date_formats` in config
 
 Bug fixes:
 ----------

pgcli/main.py

@@ -19,7 +19,11 @@
 from typing import Optional
 
 from cli_helpers.tabular_output import TabularOutputFormatter
-from cli_helpers.tabular_output.preprocessors import align_decimals, format_numbers
+from cli_helpers.tabular_output.preprocessors import (
+    align_decimals,
+    format_numbers,
+    format_timestamps,
+)
 from cli_helpers.utils import strip_ansi
 from .explain_output_formatter import ExplainOutputFormatter
 import click
@@ -111,12 +115,13 @@
 
 OutputSettings = namedtuple(
     "OutputSettings",
-    "table_format dcmlfmt floatfmt missingval expanded max_width case_function style_output max_field_width",
+    "table_format dcmlfmt floatfmt column_date_formats missingval expanded max_width case_function style_output max_field_width",
 )
 OutputSettings.__new__.__defaults__ = (
     None,
     None,
     None,
+    None,
     "<null>",
     False,
     None,
@@ -264,6 +269,7 @@ def __init__(
         self.on_error = c["main"]["on_error"].upper()
         self.decimal_format = c["data_formats"]["decimal"]
         self.float_format = c["data_formats"]["float"]
+        self.column_date_formats = c["column_date_formats"]
         auth.keyring_initialize(c["main"].as_bool("keyring"), logger=self.logger)
         self.show_bottom_toolbar = c["main"].as_bool("show_bottom_toolbar")
 
@@ -1179,6 +1185,7 @@ def _evaluate_command(self, text):
                 table_format=self.table_format,
                 dcmlfmt=self.decimal_format,
                 floatfmt=self.float_format,
+                column_date_formats=self.column_date_formats,
                 missingval=self.null_string,
                 expanded=expanded,
                 max_width=max_width,
@@ -1830,6 +1837,7 @@ def format_status(cur, status):
         "missing_value": settings.missingval,
         "integer_format": settings.dcmlfmt,
         "float_format": settings.floatfmt,
+        "column_date_formats": settings.column_date_formats,
         "preprocessors": (format_numbers, format_arrays),
         "disable_numparse": True,
         "preserve_whitespace": True,
@@ -1839,6 +1847,9 @@ def format_status(cur, status):
     if not settings.floatfmt:
         output_kwargs["preprocessors"] = (align_decimals,)
 
+    if settings.column_date_formats:
+        output_kwargs["preprocessors"] += (format_timestamps,)
+
     if table_format == "csv":
         # The default CSV dialect is "excel" which is not handling newline values correctly
         # Nevertheless, we want to keep on using "excel" on Windows since it uses '\r\n'

pgcli/pgclirc

@@ -240,3 +240,8 @@ output.null = "#808080"
 [data_formats]
 decimal = ""
 float = ""
+
+# Per column formats for date/timestamp columns
+[column_date_formats]
+# use strftime format, e.g.
+# created = "%Y-%m-%d"

tests/test_main.py

@@ -76,6 +76,57 @@ def test_format_output():
     assert list(results) == expected
 
 
+def test_column_date_formats():
+    settings = OutputSettings(
+        table_format="psql",
+        column_date_formats={
+            "date_col": "%Y-%m-%d",
+            "datetime_col": "%I:%M:%S %m/%d/%y",
+        },
+    )
+    data = [
+        ("name1", "2024-12-13T18:32:22", "2024-12-13T19:32:22", "2024-12-13T20:32:22"),
+        ("name2", "2025-02-13T02:32:22", "2025-02-13T02:32:22", "2025-02-13T02:32:22"),
+    ]
+    headers = ["name", "date_col", "datetime_col", "unchanged_col"]
+
+    results = format_output("Title", data, headers, "test status", settings)
+    expected = [
+        "Title",
+        "+-------+------------+-------------------+---------------------+",
+        "| name  | date_col   | datetime_col      | unchanged_col       |",
+        "|-------+------------+-------------------+---------------------|",
+        "| name1 | 2024-12-13 | 07:32:22 12/13/24 | 2024-12-13T20:32:22 |",
+        "| name2 | 2025-02-13 | 02:32:22 02/13/25 | 2025-02-13T02:32:22 |",
+        "+-------+------------+-------------------+---------------------+",
+        "test status",
+    ]
+    assert list(results) == expected
+
+
+def test_no_column_date_formats():
+    """Test that not setting any column date formats returns unaltered datetime columns"""
+    settings = OutputSettings(table_format="psql")
+    data = [
+        ("name1", "2024-12-13T18:32:22", "2024-12-13T19:32:22", "2024-12-13T20:32:22"),
+        ("name2", "2025-02-13T02:32:22", "2025-02-13T02:32:22", "2025-02-13T02:32:22"),
+    ]
+    headers = ["name", "date_col", "datetime_col", "unchanged_col"]
+
+    results = format_output("Title", data, headers, "test status", settings)
+    expected = [
+        "Title",
+        "+-------+---------------------+---------------------+---------------------+",
+        "| name  | date_col            | datetime_col        | unchanged_col       |",
+        "|-------+---------------------+---------------------+---------------------|",
+        "| name1 | 2024-12-13T18:32:22 | 2024-12-13T19:32:22 | 2024-12-13T20:32:22 |",
+        "| name2 | 2025-02-13T02:32:22 | 2025-02-13T02:32:22 | 2025-02-13T02:32:22 |",
+        "+-------+---------------------+---------------------+---------------------+",
+        "test status",
+    ]
+    assert list(results) == expected
+
+
 def test_format_output_truncate_on():
     settings = OutputSettings(
         table_format="psql", dcmlfmt="d", floatfmt="g", max_field_width=10