[ini]

.gitignore

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+/build/

source/main.py

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+import sys as _sys
+import json as _json
+import yaml as _yaml
+import argparse as _argparse
+
+
+def convey(
+	x,
+	fs
+):
+	y = x
+	for f in fs:
+		y = f(y)
+	return y
+	
+
+def string_coin(
+	template,
+	arguments,
+	options = None
+):
+	options = (
+		{
+			"character_open": "{{",
+			"character_close": "}}"
+		}
+		|
+		(options or {})
+	)
+	result = template
+	for (key, value, ) in arguments.items():
+		result = result.replace(
+			(
+				"%s%s%s"
+				% (
+					options["character_open"],
+					key,
+					options["character_close"],
+				)
+			),
+			value
+		)
+	return result
+	
+
+def file_read(
+	path
+):
+	handle = open(path, "r")
+	content = handle.read()
+	handle.close()
+	return content
+	
+
+def handle_value(
+	value,
+	options = None
+):
+	options = (
+		{
+			"indicator": "@",
+		}
+		|
+		(options or {})
+	)
+	return (
+		file_read(value[len(options["indicator"]):])
+		if
+		value.startswith(options["indicator"])
+		else
+		value
+	)	
+	
+
+def data_from_file(
+	path
+):
+	return (
+		{}
+		if
+		(path is None)
+		else
+		(
+			(
+				lambda content: (
+					_json.loads(content)
+					if
+					path.endswith(".json")
+					else
+					_yaml.safe_load(content)
+				)
+			) (file_read(path))
+		)
+	)
+	
+
+def data_from_arguments(
+	arguments
+):
+	return dict(
+		map(
+			lambda argument: (
+				(
+					lambda parts: (
+						parts[0],
+						handle_value(parts[1]),
+					)
+				) (argument.split(":", 1))
+			),
+			(arguments or {})
+		)
+	)
+	
+
+def main(
+):
+	## args
+	argument_parser = _argparse.ArgumentParser(
+		prog = "coin",
+		formatter_class = _argparse.ArgumentDefaultsHelpFormatter,
+		description = "transforms an input string (stdin) by processing its placeholders; example: »echo '{{flowers}} are {{color}}' | coin -a flowers:roses -a color:red«",
+	)
+	argument_parser.add_argument(
+		"-d",
+		"--data-path",
+		type = str,
+		default = None,
+		metavar = "<data-path>",
+		help = "path to JSON or YAML file, containing placeholder assignments (e.g. »{\"flowers\": \"roses\", \"color\": \"red\"}«)",
+	)
+	argument_parser.add_argument(
+		"-a",
+		"--argument",
+		type = str,
+		dest = "arguments",
+		action = "append",
+		default = None,
+		metavar = "<key>:<value>",
+		help = "prefixing <value> with '@' causes the value to be interpreted as the path to a text file, whose content shall be used",
+	)
+	argument_parser.add_argument(
+		"-o",
+		"--character-open",
+		type = str,
+		default = "{{",
+		metavar = "<character-open>",
+		help = "placeholder opening character",
+	)
+	argument_parser.add_argument(
+		"-c",
+		"--character-close",
+		type = str,
+		default = "}}",
+		metavar = "<character-close>",
+		help = "placeholder closing character",
+	)
+	args = argument_parser.parse_args()
+	
+	## exec
+	content_in = _sys.stdin.read()
+	data = (
+		data_from_file(args.data_path)
+		|
+		data_from_arguments(args.arguments)
+	)
+	content_out = string_coin(
+		content_in,
+		data,
+		{
+			"character_open": args.character_open,
+			"character_close": args.character_close,
+		}
+	)
+	_sys.stdout.write(content_out)
+	
+
+main()
+

tools/build

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+#!/usr/bin/env sh
+
+## consts
+
+dir_source="source"
+dir_build="build"
+
+
+## exec
+
+mkdir -p ${dir_build}
+echo "#!/usr/bin/env python3" > ${dir_build}/coin
+cat ${dir_source}/main.py >> ${dir_build}/coin
+chmod +x ${dir_build}/coin
+

tools/install

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+#!/usr/bin/env sh
+
+## consts
+
+dir_build="build"
+
+
+## args
+
+if [ $# -ge 1 ] ; then dir_target=$1 ; else dir_target=/usr/local/bin ; fi
+
+
+## exec
+
+cp ${dir_build}/coin ${dir_target}/coin
+