min.c - Asset Minifier

min.c provides conservative CSS, JavaScript, and HTML asset minification as a small C library and stdin/stdout CLI. It reduces payload size while preserving valid runtime behavior for common web asset pipelines.

CLI

Examples

Minify CSS:

echo 'body { color: red; }' | ./bin/x86_64/linux/min css

Minify JavaScript:

echo 'const x = 1; // comment' | ./bin/x86_64/linux/min js

Minify HTML:

echo '<div>  hello  </div>' | ./bin/x86_64/linux/min html

Parameters

Minification Behavior

CSS — removes block comments, collapses whitespace, removes trailing semicolons before }, and strips unit suffixes from zero values. Preserves quoted strings and calc() spacing.

JS — removes line and block comments, collapses whitespace between tokens. Preserves quoted strings, template literals, and regex literals. Regex detection is context-aware using the preceding significant character.

HTML — removes HTML comments, collapses whitespace between tokens. Preserves content inside <pre> and <textarea> verbatim. Preserves spaces adjacent to inline elements.

Public API

#include "min.h"

kc_min_t *ctx = kc_min_open();
char *output = NULL;

kc_min_set_mode(ctx, KC_MIN_MODE_CSS);
kc_min_exec(ctx, "body { color: red; }", &output);

kc_min_free(output);
kc_min_close(ctx);

Lifecycle

• kc_min_open() - allocates and returns a new context owned by the caller.
• kc_min_set_mode() - selects CSS, JavaScript, or HTML minification.
• kc_min_mode() - converts a CLI mode name to an API mode constant.
• kc_min_exec() - minifies a null-terminated input string and returns an owned output string.
• kc_min_free() - releases output strings allocated by the library.
• kc_min_close() - releases the context.

Build

Compiled artifacts are generated under bin/{arch}/{platform}/ for the host architecture running the build.

make clean && make

The host build emits:

bin/{arch}/{platform}/min
bin/{arch}/{platform}/libmin.a
bin/{arch}/{platform}/libmin.so

Windows builds emit:

bin/{arch}/windows/min.exe
bin/{arch}/windows/libmin.dll
bin/{arch}/windows/libmin.dll.a

Multiarch Builds

The project is prepared to build artifacts for multiple architectures under bin/{arch}/{platform}/. A plain make builds only the current host architecture, while the targets below build the full matrix or a specific target.

make all
make x86_64/linux
make x86_64/windows
make i686/linux
make i686/windows
make aarch64/linux
make aarch64/android
make armv7/linux
make armv7/android
make armv7hf/linux
make riscv64/linux
make powerpc64le/linux
make mips/linux
make mipsel/linux
make mips64el/linux
make s390x/linux
make loongarch64/linux

License

This project is distributed under the GNU General Public License version 3 (GPLv3).

Repo

GitHub: kaisarcode/min.c