From PKGBUILD removed provides and conflicts options.

Now, instead of git repo cloning, release archive is being used.
And let's remove that sentence from README.

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 Alexander "Arav" Andreev <me@arav.top>
+Copyright (c) 2021-2023 Alexander "Arav" Andreev <me@arav.su>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

Makefile

@@ -1,15 +1,15 @@
 TARGET=kwh-cost
 
-CFLAGS=--std=c2x -O3 -Wall -Werror -Wextra -pedantic
+DESTDIR:=
+PREFIX:=/usr/local
+
+CFLAGS=--std=c99 -O3 -Wall -Werror -Wextra -pedantic
 
 SRC_DIR=src
-OBJ_DIR=obj
 
 DESTDIR=/
 
-.PHONY: all ${TARGET} clean install uninstall
-
-all: ${TARGET}
+.PHONY: clean install uninstall test
 
 ${TARGET}: ${SRC_DIR}/main.c ${SRC_DIR}/main.h
 	${CC} ${CFLAGS} ${LDFLAGS} $< -o $@
@@ -18,12 +18,12 @@ clean:
 	rm ${TARGET}
 
 install:
-	install -Dm755 ${TARGET} ${DESTDIR}usr/bin/${TARGET}
-	install -Dm644 LICENSE ${DESTDIR}usr/share/licenses/${TARGET}/LICENSE
+	install -Dm755 ${TARGET} ${DESTDIR}${PREFIX}/bin/${TARGET}
+	install -Dm644 LICENSE ${DESTDIR}${PREFIX}/share/licenses/${TARGET}/LICENSE
 
 uninstall:
-	rm -f ${DESTDIR}usr/bin/${TARGET}
-	rm -rf ${DESTDIR}usr/share/licenses/${TARGET}
+	rm -f ${DESTDIR}${PREFIX}/bin/${TARGET}
+	rm -rf ${DESTDIR}${PREFIX}/share/licenses/${TARGET}
 
 test:
 	@echo -n "Does input \"3.68 120 30d\" gives 317.95? "

PKGBUILD

@@ -1,16 +1,13 @@
-# Maintainer: Alexander "Arav" Andreev <me@arav.top>
-pkgname=kwh-cost-git
-pkgver=1.0.0
+# Maintainer: Alexander "Arav" Andreev <me@arav.su>
+pkgname=kwh-cost
+pkgver=1.1.1
 pkgrel=1
 pkgdesc="Calculates cost of electricity."
 arch=('i686' 'x86_64' 'arm' 'armv6h' 'armv7h' 'aarch64')
-url="https://git.arav.top/Arav/kwh-cost"
+url="https://git.arav.su/Arav/kwh-cost"
 license=('MIT')
-makedepends=('git' 'gcc')
-provides=('kwh-cost')
-conflicts=('kwh-cost')
 options=('strip')
-source=('kwh-cost-git::git+https://git.arav.top/Arav/kwh-cost.git')
+source=("${pkgver}.tar.gz::https://git.arav.su/Arav/kwh-cost/archive/${pkgver}.tar.gz")
 md5sums=('SKIP')
 
 build() {
@@ -20,5 +17,5 @@ build() {
 
 package() {
     cd "$srcdir/$pkgname"
-    make DESTDIR="$pkgdir/" install
+    make DESTDIR="$pkgdir/" PREFIX="/usr" install
 }

README.md

@@ -18,12 +18,10 @@ Options are `-v, --version` to show program's version; and `-h, --help` to show
 Here is an example:
 
 ```console
-$ kwh-cost 3.83 120 30d 2h
+$ kwh-cost 4.02 120 30d 2h
 ```
 
-Will give 331.83.
-
-P.S.: Yeah, I pay 3.83 rubles per kWh. Which is just $0.05. :)
+Will give 348.29.
 
 ## Installation
 
@@ -33,4 +31,6 @@ First run `make` to build a program, and then `make install` to copy executable
 
 ### For ArchLinux
 
-You can take a [PKGBUILD](/Arav/kwh-cost/raw/branch/master/PKGBUILD) file and in a directory with it run `makepkg -i`.
+You can take a [PKGBUILD](/Arav/kwh-cost/raw/branch/master/PKGBUILD) file and in a directory with it run `makepkg -i`.
+
+If you want to use a pre-built package for Arch from Releases, then install it using `pacman -U` command.

src/main.c

@@ -4,26 +4,25 @@
 
 #include "main.h"
 
-int main(int const argc, const char * const * const argv) {
+int main(const int argc, const char *const *const argv) {
     price_t price;
     wattage_t wattage;
     interval_t interval = 0;
 
     int res = parse_arguments(argc, argv, &price, &wattage, &interval);
-    if (res != 0) {
-        if (res == 1)
-            print_usage();
-        else if (res == 2)
-            print_version();
-        exit(0);
-    }
+    switch (res) {
+        case 1: print_usage(); exit(0);
+        case 2: print_version(); exit(0);
+        case 99: fputs("Unknown flag provided.\n", stderr); print_usage(); exit(1);
+    }   
 
     printf("%.2Lf\n", (price * wattage) * interval);
 
     return 0;
 }
 
-int parse_arguments(const int argc, const char *const *const argv, price_t *const price, wattage_t *const wattage, interval_t *const interval) {
+int parse_arguments(const int argc, const char *const *const argv,
+                    price_t *const price, wattage_t *const wattage, interval_t *const interval) {
     if (argc < 2) return 1;
 
     for (int i = 1, pos = 0; i < argc; ++i)
@@ -32,21 +31,23 @@ int parse_arguments(const int argc, const char *const *const argv, price_t *cons
                 return 1;
             else if (argv[i][1] == 'v' || argv[i][2] == 'v')
                 return 2;
+            else
+                return 99;
         } else if (argc < 4) {
             return 1;
         } else if (pos == 0) {
-            *price = to_wattspersecond((price_t)atof(argv[i]));
+            *price = price_kwh_to_wattspersecond((price_t)atof(argv[i]));
             ++pos;
         } else if (pos == 1) {
             *wattage = (wattage_t)atof(argv[2]);
             ++pos;
         } else
-            *interval += (interval_t)interval_to_seconds(argv[i]);
+            *interval += interval_to_seconds(argv[i]);
 
     return 0;
 }
 
-inline interval_t interval_to_seconds(const char * const interval) {
+inline interval_t interval_to_seconds(const char *const interval) {
     interval_t intrvl = (interval_t)atol(interval);
 
     switch (interval[strlen(interval) - 1]) {
@@ -64,26 +65,27 @@ inline interval_t interval_to_seconds(const char * const interval) {
     }
 }
 
-inline price_t to_wattspersecond(const price_t price) {
+inline price_t price_kwh_to_wattspersecond(const price_t price) {
     return price / 1000.f / 3600.f;
 }
 
 inline void print_version() {
-    puts("kwh-cost Ver. " VERSION "\n"
-         "Copyright (C) 2021 Alexander \"Arav\" Andreev <me@arav.top>. All rights reserved.\n"
-         "You can see a license for this program in /usr/share/licenses/kwh-cost/LICENSE.");
+    fputs("kwh-cost Ver. " VERSION "\n"
+         "Copyright (C) 2021-2023 Alexander \"Arav\" Andreev <me@arav.su>. All rights reserved.\n"
+         "You can see a license for this program in /usr/share/licenses/kwh-cost/LICENSE.\n", stderr);
 }
 
 inline void print_usage() {
-    puts("Usage: kwh-cost [OPTIONS] price wattage interval [interval ...]\n"
+    fputs("Usage: kwh-cost [OPTIONS] price wattage interval [interval ...]\n"
          "Options:\n"
-         "  --help, -h    Display this usage information.\n"
-         "  --version, -v Display program version.\n"
+         "  --help, -h     display this usage information.\n"
+         "  --version, -v  display program version.\n"
          "Arguments:\n"
-         "  price    Price per kWh.\n"
-         "  wattage  Specify power usage in Watts.\n"
-         "  interval Time interval in seconds total cost to be calculated for.\n"
-         "           You may specify other time units such as:\n"
-         "           m'inute, h'our, d'ay. Example: 5d 3h.\n"
-         "           All given intervals will be summed up.");
+         "  price     price per kWh.\n"
+         "  wattage   power usage in Watts.\n"
+         "  interval  time interval in seconds during which\n"
+         "            this much power to be constantly used.\n"
+         "            You may specify other time units such as:\n"
+         "            m'inute, h'our, d'ay. Example: 5d 3h.\n"
+         "            All given intervals will be summed up.\n", stderr);
 }

src/main.h

@@ -1,16 +1,17 @@
 #ifndef _MAIN_H_
 #define _MAIN_H_
 
-#define VERSION "1.0.0"
+#define VERSION "1.1.1"
 
 typedef long double   price_t;
 typedef long double   wattage_t;
 typedef unsigned long interval_t;
 
-int parse_arguments(const int argc, const char *const *const argv, price_t *const price, wattage_t *const wattage, interval_t *const interval);
+int parse_arguments(const int argc, const char *const *const argv,
+                    price_t *const price, wattage_t *const wattage, interval_t *const interval);
 
-inline interval_t interval_to_seconds(const char * const interval);
-inline price_t    to_wattspersecond(const price_t price);
+inline interval_t interval_to_seconds(const char *const interval);
+inline price_t    price_kwh_to_wattspersecond(const price_t price);
 
 inline void print_version();
 inline void print_usage();