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Allow reading input from other files than stdin

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This commit is contained in:
Chris Josten 2020-12-05 13:03:47 +01:00
parent 8ca791d3d0
commit 9161a33154
Signed by: chris
GPG key ID: 1795A594046530AB
2 changed files with 19 additions and 4 deletions
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4
README.txt
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@ -6,6 +6,6 @@ Run "dub".
HOW TO RUN:
./oac-2020 [day] [part]
./oac-2020 [DAY] [PART] <INPUT_FILE> <DAY_SPECIFIC_ARGUMENTS...>
The program reads it input from stdin.
The program reads it input from stdin if INPUT_FILE is not specified or if INPUT_FILE is equal to "-".

19
source/app.d
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@ -1,6 +1,7 @@
import core.stdc.stdlib;
import std.conv;
import std.exception;
import std.format;
import std.stdio;
import std.getopt;
@ -28,7 +29,10 @@ void printUsage(string name) {
}
void printUsage(string name, string message) {
stderr.writeln("USAGE: %s [day] [part]".format(name));
stderr.writeln("USAGE: %s [DAY] [PART] <INPUT_FILE> ".format(name));
stderr.writeln(" DAY = int between 1 and 25 (inclusive), specifiying the day to run");
stderr.writeln(" PART = int between 1 and 2 (inclusive), specifiying the part to run");
stderr.writeln(" INPUT_FILE = file to read from. '-' or missing implies stdin");
if (message != null) {
stderr.writeln(message);
}
@ -56,9 +60,20 @@ void main(string[] args) {
} catch (ConvException e) {
printUsage(args[0], "[part] is not an integer");
}
File file;
if (args.length < 4 || args[3] == "-") {
file = stdin;
} else {
try {
file = File(args[3], "rb");
} catch (ErrnoException e) {
printUsage(args[0], "Error %d while opening input file: %s".format(e.errno, e.message));
}
}
try {
Variant result = programs[day - 1](part, stdin, args[3..$]);
Variant result = programs[day - 1](part, file, args[3..$]);
writeln(result);
} catch(ArgumentException e) {
printUsage(args[0], e.msg);