Monorepo for Tangled
nix,dolly: subset input files to dolly derivation
this greatly improves build speed of derivations that depend on the
dolly derivation, because it no longer rebuilds everytime there is a
change to appview.
Signed-off-by: oppiliappan <me@oppi.li>
authored by
oppiliappan
and committed by
tangled.org
(Jan 19, 2026, 7:28 AM UTC)
0c233644
d65eed2e
+48
-28
+23
-10
cmd/dolly/main.go
+23
-10
cmd/dolly/main.go
···
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import (
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"bytes"
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_ "embed"
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"flag"
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"fmt"
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"image"
···
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"github.com/srwiley/oksvg"
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"github.com/srwiley/rasterx"
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"golang.org/x/image/draw"
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-
"tangled.org/core/appview/pages"
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"tangled.org/core/ico"
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)
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func main() {
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var (
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size string
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fillColor string
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output string
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size string
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fillColor string
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+
output string
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templatePath string
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)
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flag.StringVar(&templatePath, "template", "", "Path to dolly go-html template")
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flag.StringVar(&size, "size", "512x512", "Output size in format WIDTHxHEIGHT (e.g., 512x512)")
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flag.StringVar(&fillColor, "color", "#000000", "Fill color in hex format (e.g., #FF5733)")
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flag.StringVar(&output, "output", "dolly.svg", "Output file path (format detected from extension: .svg, .png, or .ico)")
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flag.Parse()
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if templatePath == "" {
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fmt.Fprintf(os.Stderr, "Empty template path")
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os.Exit(1)
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}
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width, height, err := parseSize(size)
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if err != nil {
···
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os.Exit(1)
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}
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svgData, err := dolly(fillColor)
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tpl, err := os.ReadFile(templatePath)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to read template from path %s: %v\n", templatePath, err)
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os.Exit(1)
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}
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svgData, err := dolly(string(tpl), fillColor)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error generating SVG: %v\n", err)
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os.Exit(1)
···
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fmt.Printf("Successfully generated %s (%dx%d)\n", output, width, height)
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}
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func dolly(hexColor string) ([]byte, error) {
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tpl, err := template.New("dolly").
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ParseFS(pages.Files, "templates/fragments/dolly/logo.html")
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func dolly(tplString, hexColor string) ([]byte, error) {
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tpl, err := template.New("dolly").Parse(tplString)
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if err != nil {
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return nil, err
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}
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var svgData bytes.Buffer
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if err := tpl.ExecuteTemplate(&svgData, "fragments/dolly/logo", pages.DollyParams{
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FillColor: hexColor,
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if err := tpl.ExecuteTemplate(&svgData, "fragments/dolly/logo", map[string]any{
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"FillColor": hexColor,
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"Classes": "",
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}); err != nil {
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return nil, err
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}
+25
-18
nix/pkgs/dolly.nix
+25
-18
nix/pkgs/dolly.nix
···
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{
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lib,
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buildGoApplication,
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modules,
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src,
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}:
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buildGoApplication {
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pname = "dolly";
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version = "0.1.0";
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inherit src modules;
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-
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# patch the static dir
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postUnpack = ''
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pushd source
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mkdir -p appview/pages/static
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touch appview/pages/static/x
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popd
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'';
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-
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doCheck = false;
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subPackages = ["cmd/dolly"];
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}
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writeShellScriptBin,
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}: let
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src = lib.fileset.toSource {
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root = ../..;
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fileset = lib.fileset.unions [
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../../go.mod
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../../ico
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../../cmd/dolly/main.go
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../../appview/pages/templates/fragments/dolly/logo.html
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];
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};
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dolly-unwrapped = buildGoApplication {
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pname = "dolly-unwrapped";
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version = "0.1.0";
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inherit src modules;
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doCheck = false;
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subPackages = ["cmd/dolly"];
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};
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in
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writeShellScriptBin "dolly" ''
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exec ${dolly-unwrapped}/bin/dolly \
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-template ${src}/appview/pages/templates/fragments/dolly/logo.html \
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"$@"
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''