initial

17 files changed, 1277 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cef0f74
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/.idea
+/htdocs/dist*
+/node_modules
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1d36345
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+all:
+	@echo "Supported commands:"
+	@echo
+	@echo "    \033[1mmake scss\033[0m  - build scss assets"
+	@echo "    \033[1mmake less\033[0m  - build less assets"
+	@echo
+
+scss:
+	./build_css.sh -t scss -i ./htdocs/scss -o ./htdocs/dist-scss/
+
+less:
+	./build_css.sh -t less -i ./htdocs/less -o ./htdocs/dist-less/
+
+.PHONY: all scss less
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..67451c9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+# dark_theme_impl_example
+
+This repository contains the backend part or the light/dark theme switch implementation example for websites using
+sass/less compilers without using css3 variables and also without webpack or similar crap.
+
+The [stylesheet](htdocs/scss/app.scss) used for this example is very minimalistic and contains only few rules, but that's
+only for demonstration purposes. This technique has been used in real project for years on very large and very complicated
+set of stylesheets (hundreds of kilobytes when compiled and minimized) and proven to be reliable.
+
+Check out my [blog post](https://ch1p.io/dark-theme-scss-less-without-css3-variables/edit/) if you want to learn more.
+
+## Requirements
+
+- `sassc` compiler (in debian, the package is called `sassc`) for scss
+- nodejs
+
+Clone repository:
+
+```
+git clone https://git.ch1p.io/dark_theme_impl_example.git
+cd dark_theme_impl_example
+```
+
+Install dependencies:
+```
+npm i
+```
+
+Build the scss example:
+```
+make scss
+```
+
+Build the less example:
+```
+make less
+```
+
+Check out results in `htdocs/dist-less` or `htdocs/dist-scss`.
+
+# License
+
+MIT
\ No newline at end of file
diff --git a/build_css.sh b/build_css.sh
new file mode 100755
index 0000000..9334ce0
--- /dev/null
+++ b/build_css.sh
@@ -0,0 +1,137 @@
+#!/bin/bash
+
+PROGNAME="$0"
+DIR="$( cd "$( dirname "$(readlink -f "${BASH_SOURCE[0]}")" )" && pwd )"
+ROOT="$(realpath "$DIR")"
+CLEANCSS="$ROOT"/node_modules/clean-css-cli/bin/cleancss
+LESSC="$ROOT"/node_modules/.bin/lessc
+THEMES="light dark"
+TARGETS="app"
+INDIR=
+OUTDIR=
+TYPE=
+
+error() {
+    >&2 echo "error: $@"
+}
+
+die() {
+    error "$@"
+    exit 1
+}
+
+installed() {
+    command -v "$1" > /dev/null
+    return $?
+}
+
+usage() {
+    cat <<EOF
+usage: $PROGNAME [OPTIONS]
+
+Options:
+    -o  output directory
+    -i  input directory
+    -t  'less' or 'scss'
+    -h  show this help
+EOF
+    exit
+}
+
+build() {
+    local entry_name="$1"
+    local theme="$2"
+
+    local input="$INDIR/entries/$entry_name/$theme.$TYPE"
+    local output="$OUTDIR/$entry_name"
+    [ "$theme" = "dark" ] && output="${output}_dark"
+    output="${output}.css"
+
+    case "$TYPE" in
+        less) "$LESSC" -x "$input" "$output" ;;
+        scss) sassc -t compressed "$input" "$output" ;;
+    esac
+}
+
+cleancss() {
+    local entry_name="$1"
+    local theme="$2"
+
+    local file="$OUTDIR/$entry_name"
+    [ "$theme" = "dark" ] && file="${file}_dark"
+    file="${file}.css"
+
+    "$CLEANCSS" -O2 "all:on;mergeSemantically:on;restructureRules:on" "$file" > "$file.tmp"
+    rm "$file"
+    mv "$file.tmp" "$file"
+}
+
+create_dark_patch() {
+    local entry_name="$1"
+    local light_file="$OUTDIR/$entry_name.css"
+    local dark_file="$OUTDIR/${entry_name}_dark.css"
+
+    "$DIR"/gen_css_diff.js "$light_file" "$dark_file" > "$dark_file.diff"
+    rm "$dark_file"
+    mv "$dark_file.diff" "$dark_file"
+}
+
+[ -z "$1" ] && usage
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -o)
+            OUTDIR="$2"
+            shift
+            ;;
+        -i)
+            INDIR="$2"
+            shift
+            ;;
+
+        -t)
+            case $2 in
+                less|scss) TYPE="$2" ;;
+                *) die "invalid type: $2" ;;
+            esac
+            shift
+            ;;
+
+        -h)
+            usage
+            ;;
+        *)
+            die "unexpected argument: $1"
+            ;;
+    esac
+    shift
+done
+
+[ -z "$OUTDIR" ] && die "output directory is not specified"
+[ -z "$INDIR" ] && die "input directory is not specified"
+[ -z "$TYPE" ] && die "type is not specified"
+
+if [ ! -d "$OUTDIR" ]; then
+    mkdir "$OUTDIR"
+else
+    rm "$OUTDIR"/*
+fi
+
+[ -x "$CLEANCSS" ] || die "$CLEANCSS: cleancss not found"
+case "$TYPE" in
+    less) [ -x "$LESSC" ] || die "$LESSC: lessc not found" ;;
+    scss) installed sassc || die "sassc not found" ;;
+esac
+
+for theme in $THEMES; do
+    for target in $TARGETS; do
+        build "$target" "$theme"
+    done
+done
+
+for target in $TARGETS; do
+    create_dark_patch "$target"
+    for theme in $THEMES; do
+        cleancss "$target" "$theme"
+    done
+done
\ No newline at end of file
diff --git a/gen_css_diff.js b/gen_css_diff.js
new file mode 100755
index 0000000..5ca1945
--- /dev/null
+++ b/gen_css_diff.js
@@ -0,0 +1,14 @@
+#!/usr/bin/env node
+const {generateCSSPatch} = require('css-patch')
+const fs = require('fs')
+
+const files = process.argv.slice(2)
+if (files.length !== 2) {
+    console.log(`usage: ${process.argv[0]} file1 file2`)
+    process.exit()
+}
+
+const css1 = fs.readFileSync(files[0], 'utf-8')
+const css2 = fs.readFileSync(files[1], 'utf-8')
+
+console.log(generateCSSPatch(css1, css2))
\ No newline at end of file
diff --git a/htdocs/less/app.less b/htdocs/less/app.less
new file mode 100644
index 0000000..f3bb31a
--- /dev/null
+++ b/htdocs/less/app.less
@@ -0,0 +1,6 @@
+body {
+  background-color: @bg;
+  color: @fg;
+  font-size: 16px;
+  font-family: sans-serif;
+}
\ No newline at end of file
diff --git a/htdocs/less/colors/dark.less b/htdocs/less/colors/dark.less
new file mode 100644
index 0000000..fb220f7
--- /dev/null
+++ b/htdocs/less/colors/dark.less
@@ -0,0 +1,2 @@
+@fg: #eee;
+@bg: #222;
diff --git a/htdocs/less/colors/light.less b/htdocs/less/colors/light.less
new file mode 100644
index 0000000..4843a5b
--- /dev/null
+++ b/htdocs/less/colors/light.less
@@ -0,0 +1,2 @@
+@fg: #222;
+@bg: #fff;
diff --git a/htdocs/less/entries/app/dark.less b/htdocs/less/entries/app/dark.less
new file mode 100644
index 0000000..bbf5099
--- /dev/null
+++ b/htdocs/less/entries/app/dark.less
@@ -0,0 +1,2 @@
+@import '../../colors/dark';
+@import '../../app';
\ No newline at end of file
diff --git a/htdocs/less/entries/app/light.less b/htdocs/less/entries/app/light.less
new file mode 100644
index 0000000..226ca61
--- /dev/null
+++ b/htdocs/less/entries/app/light.less
@@ -0,0 +1,2 @@
+@import '../../colors/light';
+@import '../../app';
\ No newline at end of file
diff --git a/htdocs/scss/app.scss b/htdocs/scss/app.scss
new file mode 100644
index 0000000..7a68e3f
--- /dev/null
+++ b/htdocs/scss/app.scss
@@ -0,0 +1,6 @@
+body {
+  background-color: $bg;
+  color: $fg;
+  font-size: 16px;
+  font-family: sans-serif;
+}
\ No newline at end of file
diff --git a/htdocs/scss/colors/dark.scss b/htdocs/scss/colors/dark.scss
new file mode 100644
index 0000000..4e939ff
--- /dev/null
+++ b/htdocs/scss/colors/dark.scss
@@ -0,0 +1,2 @@
+$fg: #eee;
+$bg: #222;
diff --git a/htdocs/scss/colors/light.scss b/htdocs/scss/colors/light.scss
new file mode 100644
index 0000000..d0ba5d4
--- /dev/null
+++ b/htdocs/scss/colors/light.scss
@@ -0,0 +1,2 @@
+$fg: #222;
+$bg: #fff;
diff --git a/htdocs/scss/entries/app/dark.scss b/htdocs/scss/entries/app/dark.scss
new file mode 100644
index 0000000..bbf5099
--- /dev/null
+++ b/htdocs/scss/entries/app/dark.scss
@@ -0,0 +1,2 @@
+@import '../../colors/dark';
+@import '../../app';
\ No newline at end of file
diff --git a/htdocs/scss/entries/app/light.scss b/htdocs/scss/entries/app/light.scss
new file mode 100644
index 0000000..226ca61
--- /dev/null
+++ b/htdocs/scss/entries/app/light.scss
@@ -0,0 +1,2 @@
+@import '../../colors/light';
+@import '../../app';
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..b720559
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1021 @@
+{
+  "name": "dark_theme_impl_example",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "dark_theme_impl_example",
+      "version": "1.0.0",
+      "license": "ISC",
+      "devDependencies": {
+        "clean-css": "^5.3.1",
+        "clean-css-cli": "^5.6.1",
+        "css-patch": "^1.2.0",
+        "less": "^4.1.3"
+      }
+    },
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+      "dev": true,
+      "dependencies": {
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+        "picomatch": "^2.0.4"
+      },
+      "engines": {
+        "node": ">= 8"
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+    },
+    "node_modules/balanced-match": {
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+      "dev": true
+    },
+    "node_modules/binary-extensions": {
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+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
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+      "dev": true,
+      "engines": {
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+      }
+    },
+    "node_modules/brace-expansion": {
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+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ],
+      "dependencies": {
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+        "braces": "~3.0.2",
+        "glob-parent": "~5.1.2",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.6.0"
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+      },
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+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      },
+      "engines": {
+        "node": "*"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..ab367db
--- /dev/null
+++ b/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "dark_theme_impl_example",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "clean-css": "^5.3.1",
+    "clean-css-cli": "^5.6.1",
+    "css-patch": "^1.2.0",
+    "less": "^4.1.3"
+  }
+}