Improve command output with text banner, colour and alignment

cats/__init__.py

@@ -14,6 +14,7 @@
 from .configure import get_runtime_config
 from .forecast import CarbonIntensityAverageEstimate
 from .optimise_starttime import get_avg_estimates  # noqa: F401
+from .constants import CATS_ASCII_BANNER_COLOUR, CATS_ASCII_BANNER_NO_COLOUR
 
 __version__ = "1.0.0"
 
@@ -170,18 +171,29 @@
     parser.add_argument(
         "--cpu",
         type=positive_integer,
-        help="Number of cpus used by the job",
+        help="Number of CPUs used by the job",
     )
     parser.add_argument(
         "--gpu",
         type=positive_integer,
-        help="Number of cpus used by the job",
+        help="Number of GPUs used by the job",
     )
     parser.add_argument(
         "--memory",
         type=positive_integer,
         help="Amount of memory used by the job, in GB",
     )
+    parser.add_argument(
+        "-n",
+        "--no-colour",
+        action="store_true",
+        help="Disable all terminal output colouring",
+    )
+    parser.add_argument(
+        "--no-color",
+        action="store_true",
+        help="Disable all terminal output colouring (alias to --no-colour)",
+    )
 
     return parser
 
@@ -195,18 +207,40 @@
     location: str
     countryISO3: str
     emmissionEstimate: Optional[Estimates] = None
+    colour: bool = False
 
     def __str__(self) -> str:
-        out = f"""Best job start time {self.carbonIntensityOptimal.start}
-Carbon intensity if job started now       = {self.carbonIntensityNow.value:.2f} gCO2eq/kWh
-Carbon intensity at optimal time          = {self.carbonIntensityOptimal.value:.2f} gCO2eq/kWh"""
+        if self.colour:
+            # Default colour
+            col_normal = "\33[0m"  # reset any colour
+
+            # Colours to indicate optimal/better results
+            col_dt_opt = "\33[32m"  # green i.e. 'good' in traffic light rating
+            col_ci_opt = "\33[32m"  # green
+            col_ee_opt = "\33[32m"  # green
+
+            # Colours to indicate original and non-optimal results
+            col_ci_now = "\33[31m"  # red i.e. 'bad' in traffic light rating
+            col_ee_now = "\33[31m"  # red
+        else:
+            col_normal = ""
+            col_dt_opt = ""
+            col_ci_opt = ""
+            col_ci_now = ""
+            col_ee_now = ""
+            col_ee_opt = ""
+
+        out = f"""
+Best job start time                       = {col_dt_opt}{self.carbonIntensityOptimal.start}{col_normal}
+Carbon intensity if job started now       = {col_ci_now}{self.carbonIntensityNow.value:.2f} gCO2eq/kWh{col_normal}
+Carbon intensity at optimal time          = {col_ci_opt}{self.carbonIntensityOptimal.value:.2f} gCO2eq/kWh{col_normal}"""
 
         if self.emmissionEstimate:
             out += f"""
-Estimated emissions if job started now    = {self.emmissionEstimate.now}
-Estimated emissions at optimal time       = {self.emmissionEstimate.best} (- {self.emmissionEstimate.savings})"""
+Estimated emissions if job started now    = {col_ee_now}{self.emmissionEstimate.now}{col_normal}
+Estimated emissions at optimal time       = {col_ee_opt}{self.emmissionEstimate.best} (- {self.emmissionEstimate.savings}){col_normal}"""
 
-        out += "\n\nUse --format=json to get this in machine readable format"
+        logging.info("Use '--format=json' to get this in machine readable format")
         return out
 
     def to_json(self, dateformat: str = "", **kwargs) -> str:
@@ -222,6 +256,15 @@
         return json.dumps(data, **kwargs)
 
 
+def print_banner(disable_colour):
+    """Print an ASCII art banner with the CATS title, optionally in colour.
+    """
+    if disable_colour:
+        print(CATS_ASCII_BANNER_NO_COLOUR)
+    else:
+        print(CATS_ASCII_BANNER_COLOUR)
+
+
 def schedule_at(
     output: CATSOutput, args: list[str], at_command: str = "at"
 ) -> Optional[str]:
@@ -251,6 +294,11 @@
 def main(arguments=None) -> int:
     parser = parse_arguments()
     args = parser.parse_args(arguments)
+    colour_output = args.no_colour or args.no_color
+
+    # Print CATS ASCII art banner, before any output from printing or logging
+    print_banner(colour_output)
+
     if args.command and not args.scheduler:
         print(
             "cats: To run a command with the -c or --command option, you must\n"
@@ -287,7 +335,8 @@
     # Find best possible average carbon intensity, along
     # with corresponding job start time.
     now_avg, best_avg = get_avg_estimates(CI_forecast, duration=duration)
-    output = CATSOutput(now_avg, best_avg, location, "GBR")
+    output = CATSOutput(
+        now_avg, best_avg, location, "GBR", colour=not colour_output)
 
     ################################
     ## Calculate carbon footprint ##

cats/configure.py

@@ -1,12 +1,12 @@
 """This module exports a function :py:func:`configure
 <cats.configure.configure>` that processes both command line arguments
 and configuration file. This function returns a runtime configuration
-for cats to make a request to a carcon intensity forecast provider.  A
+for cats to make a request to a carbon intensity forecast provider.  A
 runtime configuration consits of:
 
 - location (postcode)
 - job duration
-- Interface to carbon intensity forecast provider (See TODO)
+- interface to carbon intensity forecast provider (See TODO)
 
 """
 

cats/constants.py

@@ -1 +1,20 @@
 MEMORY_POWER_PER_GB = 0.3725  # W/GB
+
+CATS_ASCII_BANNER_COLOUR = """
+\33[34mThe\33[35m.\33[34m\33[0m____ \33[35m..... \33[0m__ \33[35m.... \33[0m________ \33[35m. \33[0m______\33[35m...
+\33[35m.. \33[0m/  __)\33[35m.....\33[0m/  \\\33[35m....\33[0m(__    __)\33[35m.\33[0m)  ____)\33[35m....
+\33[35m..\33[0m|  /\33[35m.......\33[0m/    \\\33[35m......\33[0m|  |\33[35m...\33[0m(  (___\33[35m........
+\33[35m..\33[0m| |\33[34mlimate\33[35m.\33[0m/  ()  \\\33[34mware\33[35m.\33[0m|  |\33[34mask\33[35m.\33[0m\\___  \\\33[34mcheduler
+\33[35m..\33[0m|  \\__\33[35m...\33[0m|   __   |\33[35m....\33[0m|  |\33[35m....\33[0m____)  )\33[35m....
+\33[35m...\33[0m\\    )\33[35m..\33[0m|  (\33[35m..\33[0m)  |\33[35m....\33[0m|  |\33[35m...\33[0m(      (\33[35m..\33[0m
+"""
+
+# Same as above but without the colour codes, so not given custom colouring
+CATS_ASCII_BANNER_NO_COLOUR = """
+The.____ ..... __ .... ________ . ______ ...
+.. /  __)...../  \\....(__    __).)  ____)....
+..|  /......./    \\......|  |...(  (___........
+..| |limate./  ()  \\ware.|  |ask.\\___  \\cheduler
+..|  \\__...|   __   |....|  |....____)  )....
+...\\    )..|  (..)  |....|  |...(      (..
+"""

tests/test_output.py

@@ -33,21 +33,19 @@
     [
         (
             OUTPUT,
-            """Best job start time 2024-03-16 02:00:00
+            """
+Best job start time                       = 2024-03-16 02:00:00
 Carbon intensity if job started now       = 50.00 gCO2eq/kWh
-Carbon intensity at optimal time          = 20.00 gCO2eq/kWh
-
-Use --format=json to get this in machine readable format""",
+Carbon intensity at optimal time          = 20.00 gCO2eq/kWh""",
         ),
         (
             OUTPUT_WITH_EMISSION_ESTIMATE,
-            """Best job start time 2024-03-16 02:00:00
+            """
+Best job start time                       = 2024-03-16 02:00:00
 Carbon intensity if job started now       = 50.00 gCO2eq/kWh
 Carbon intensity at optimal time          = 20.00 gCO2eq/kWh
 Estimated emissions if job started now    = 19
-Estimated emissions at optimal time       = 9 (- 10)
-
-Use --format=json to get this in machine readable format""",
+Estimated emissions at optimal time       = 9 (- 10)""",
         ),
     ],
 )
@@ -62,13 +60,13 @@ def test_string_repr(output, expected):
             OUTPUT,
             """{"carbonIntensityNow": {"end": "2024-03-15T17:00:00", "start": "2024-03-15T16:00:00", "value": 50}, """
             """"carbonIntensityOptimal": {"end": "2024-03-16T03:00:00", "start": "2024-03-16T02:00:00", "value": 20}, """
-            """"countryISO3": "GBR", "emmissionEstimate": null, "location": "OX1"}""",
+            """"colour": false, "countryISO3": "GBR", "emmissionEstimate": null, "location": "OX1"}""",
         ),
         (
             OUTPUT_WITH_EMISSION_ESTIMATE,
             """{"carbonIntensityNow": {"end": "2024-03-15T17:00:00", "start": "2024-03-15T16:00:00", "value": 50}, """
             """"carbonIntensityOptimal": {"end": "2024-03-16T03:00:00", "start": "2024-03-16T02:00:00", "value": 20}, """
-            """"countryISO3": "GBR", "emmissionEstimate": [19, 9, 10], "location": "OX1"}""",
+            """"colour": false, "countryISO3": "GBR", "emmissionEstimate": [19, 9, 10], "location": "OX1"}""",
         ),
     ],
 )
@@ -83,13 +81,13 @@ def test_output_json(output, expected):
             OUTPUT,
             """{"carbonIntensityNow": {"end": "202403151700", "start": "202403151600", "value": 50}, """
             """"carbonIntensityOptimal": {"end": "202403160300", "start": "202403160200", "value": 20}, """
-            """"countryISO3": "GBR", "emmissionEstimate": null, "location": "OX1"}""",
+            """"colour": false, "countryISO3": "GBR", "emmissionEstimate": null, "location": "OX1"}""",
         ),
         (
             OUTPUT_WITH_EMISSION_ESTIMATE,
             """{"carbonIntensityNow": {"end": "202403151700", "start": "202403151600", "value": 50}, """
             """"carbonIntensityOptimal": {"end": "202403160300", "start": "202403160200", "value": 20}, """
-            """"countryISO3": "GBR", "emmissionEstimate": [19, 9, 10], "location": "OX1"}""",
+            """"colour": false, "countryISO3": "GBR", "emmissionEstimate": [19, 9, 10], "location": "OX1"}""",
         ),
     ],
 )