Naive implementation in Go of a colorized tail command.
The utility has to be built. A Go compiler is needed.
$ go build ctaila ctail executable file will be generated.
The utility accepts the same arguments as tail do.
$ ctail -100f some_file.logctail provides the ability to specify the patterns to find and colors to print those patterns. The configure is stored on a json file ctail.config that must be location on $HOME folder. Patterns can be regular expressions.
Here is an example
{
"colors_definition": [
{ "color_name" : "default" , "ansi_definition" : "\"\\033[39m\""},
{ "color_name" : "black", "ansi_definition" : "\"\\033[30m\"" },
{ "color_name" : "red", "ansi_definition" : "\"\\033[31m\"" },
{ "color_name" : "green" , "ansi_definition" : "\"\\033[32m\""},
{ "color_name" : "yellow" , "ansi_definition" : "\"\\033[33m\"" },
{ "color_name" : "blue" , "ansi_definition" : "\"\\033[34m\"" },
{ "color_name" : "magenta" , "ansi_definition" : "\"\\033[35m\"" },
{ "color_name" : "cyan" , "ansi_definition" : "\"\\033[36m\"" },
{ "color_name" : "light gray" , "ansi_definition" : "\"\\033[37m\"" },
{ "color_name" : "dark gray" , "ansi_definition" : "\"\\033[90m\"" },
{ "color_name" : "light red" , "ansi_definition" : "\"\\033[91m\"" },
{ "color_name" : "light green" , "ansi_definition" : "\"\\033[92m\"" },
{ "color_name" : "light yellow" , "ansi_definition" : "\"\\033[93m\"" },
{ "color_name" : "light blue" , "ansi_definition" : "\"\\033[94m\"" },
{ "color_name" : "light magenta" , "ansi_definition" : "\"\\033[95m\"" },
{ "color_name" : "light cyan" , "ansi_definition" : "\"\\033[96m\"" },
{ "color_name" : "light white" , "ansi_definition" : "\"\\033[97m\"" }
],
"matches" : [
{"expression": "Error|ERROR", "color" : "red" },
{"expression": "DEBUG", "color" : "green" },
{"expression": "Warning", "color" : "yellow" },
{"expression": "Exception", "color" : "red" }
]
}If no ctail.config file is find the ctail will default to some predefined values.
Assumed defaults:
{
"colors_definition": [
{ "color_name" : "default" , "ansi_definition" : "\"\\033[39m\""},
{ "color_name" : "black", "ansi_definition" : "\"\\033[30m\"" },
{ "color_name" : "red", "ansi_definition" : "\"\\033[31m\"" },
{ "color_name" : "green" , "ansi_definition" : "\"\\033[32m\""},
{ "color_name" : "yellow" , "ansi_definition" : "\"\\033[33m\"" },
{ "color_name" : "blue" , "ansi_definition" : "\"\\033[34m\"" }
],
"matches" : [
{"expression": "Error|ERROR", "color" : "red" },
{"expression": "Debug|DEBUG", "color" : "green" },
{"expression": "Warning|Warn|WARN|WARNING", "color" : "yellow" },
{"expression": "Info|INFO", "color" : "blue" }
]
}Some performance tests still need to be done. The utility is only tested on Mac OS X.
MIT. Refer to LICENCE file.
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