Initial commit

.gitignore

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+/binaries/
+/release/
+/doc/screenshot.png

Makefile

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+VERSION = 1.0.0
+
+APP      := http-file-server
+PACKAGES := $(shell go list -f {{.Dir}} ./...)
+GOFILES  := $(addsuffix /*.go,$(PACKAGES))
+GOFILES  := $(wildcard $(GOFILES))
+
+.PHONY: clean release README.md
+
+clean:
+	rm -rf binaries/
+	rm -rf release/
+
+# go get -u github.com/github/hub
+release: README.md zip
+	git reset
+	git add README.md
+	git add Makefile
+	git commit -m "Release $(VERSION)" || true
+	git push
+	hub release create $(VERSION) -m "$(VERSION)" -a release/$(APP)_$(VERSION)_osx_x86_64.tar.gz -a release/$(APP)_$(VERSION)_windows_x86_64.zip -a release/$(APP)_$(VERSION)_linux_x86_64.tar.gz -a release/$(APP)_$(VERSION)_osx_x86_32.tar.gz -a release/$(APP)_$(VERSION)_windows_x86_32.zip -a release/$(APP)_$(VERSION)_linux_x86_32.tar.gz -a release/$(APP)_$(VERSION)_linux_arm64.tar.gz
+
+README.md:
+	<README.template.md subst VERSION="$(VERSION)" APP="$(APP)" USAGE="$$(go get github.com/sgreben/$(APP); $(APP) -h 2>&1)" > README.md
+
+zip: release/$(APP)_$(VERSION)_osx_x86_64.tar.gz release/$(APP)_$(VERSION)_windows_x86_64.zip release/$(APP)_$(VERSION)_linux_x86_64.tar.gz release/$(APP)_$(VERSION)_osx_x86_32.tar.gz release/$(APP)_$(VERSION)_windows_x86_32.zip release/$(APP)_$(VERSION)_linux_x86_32.tar.gz release/$(APP)_$(VERSION)_linux_arm64.tar.gz
+
+binaries: binaries/osx_x86_64/$(APP) binaries/windows_x86_64/$(APP).exe binaries/linux_x86_64/$(APP) binaries/osx_x86_32/$(APP) binaries/windows_x86_32/$(APP).exe binaries/linux_x86_32/$(APP)
+
+release/$(APP)_$(VERSION)_osx_x86_64.tar.gz: binaries/osx_x86_64/$(APP)
+	mkdir -p release
+	tar cfz release/$(APP)_$(VERSION)_osx_x86_64.tar.gz -C binaries/osx_x86_64 $(APP)
+
+binaries/osx_x86_64/$(APP): $(GOFILES)
+	GOOS=darwin GOARCH=amd64 go build -ldflags "-X main.version=$(VERSION)" -o binaries/osx_x86_64/$(APP) .
+
+release/$(APP)_$(VERSION)_windows_x86_64.zip: binaries/windows_x86_64/$(APP).exe
+	mkdir -p release
+	cd ./binaries/windows_x86_64 && zip -r -D ../../release/$(APP)_$(VERSION)_windows_x86_64.zip $(APP).exe
+
+binaries/windows_x86_64/$(APP).exe: $(GOFILES)
+	GOOS=windows GOARCH=amd64 go build -ldflags "-X main.version=$(VERSION)" -o binaries/windows_x86_64/$(APP).exe .
+
+release/$(APP)_$(VERSION)_linux_x86_64.tar.gz: binaries/linux_x86_64/$(APP)
+	mkdir -p release
+	tar cfz release/$(APP)_$(VERSION)_linux_x86_64.tar.gz -C binaries/linux_x86_64 $(APP)
+
+binaries/linux_x86_64/$(APP): $(GOFILES)
+	GOOS=linux GOARCH=amd64 go build -ldflags "-X main.version=$(VERSION)" -o binaries/linux_x86_64/$(APP) .
+
+release/$(APP)_$(VERSION)_osx_x86_32.tar.gz: binaries/osx_x86_32/$(APP)
+	mkdir -p release
+	tar cfz release/$(APP)_$(VERSION)_osx_x86_32.tar.gz -C binaries/osx_x86_32 $(APP)
+
+binaries/osx_x86_32/$(APP): $(GOFILES)
+	GOOS=darwin GOARCH=386 go build -ldflags "-X main.version=$(VERSION)" -o binaries/osx_x86_32/$(APP) .
+
+release/$(APP)_$(VERSION)_windows_x86_32.zip: binaries/windows_x86_32/$(APP).exe
+	mkdir -p release
+	cd ./binaries/windows_x86_32 && zip -r -D ../../release/$(APP)_$(VERSION)_windows_x86_32.zip $(APP).exe
+
+binaries/windows_x86_32/$(APP).exe: $(GOFILES)
+	GOOS=windows GOARCH=386 go build -ldflags "-X main.version=$(VERSION)" -o binaries/windows_x86_32/$(APP).exe .
+
+release/$(APP)_$(VERSION)_linux_x86_32.tar.gz: binaries/linux_x86_32/$(APP)
+	mkdir -p release
+	tar cfz release/$(APP)_$(VERSION)_linux_x86_32.tar.gz -C binaries/linux_x86_32 $(APP)
+
+binaries/linux_x86_32/$(APP): $(GOFILES)
+	GOOS=linux GOARCH=386 go build -ldflags "-X main.version=$(VERSION)" -o binaries/linux_x86_32/$(APP) .
+
+release/$(APP)_$(VERSION)_linux_arm64.tar.gz: binaries/linux_arm64/$(APP)
+	mkdir -p release
+	tar cfz release/$(APP)_$(VERSION)_linux_arm64.tar.gz -C binaries/linux_arm64 $(APP)
+
+binaries/linux_arm64/$(APP): $(GOFILES)
+	GOOS=linux GOARCH=arm64 go build -ldflags "-X main.version=$(VERSION)" -o binaries/linux_arm64/$(APP) .

README.md

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+# http-file-server
+
+`http-file-server` is a dependency-free HTTP file server.
+
+![screenshot](doc/screenshot.gif)
+
+## Contents
+
+<!-- TOC -->
+
+- [Contents](#contents)
+- [Examples](#examples)
+- [Get it](#get-it)
+    - [Using `go get`](#using-go-get)
+    - [Pre-built binary](#pre-built-binary)
+- [Use it](#use-it)
+
+<!-- /TOC -->
+
+
+## Examples
+
+```sh
+$ http-file-server /tmp
+2018/11/13 23:00:03.946051 serving local path "/tmp" on "/tmp/"
+2018/11/13 23:00:03.946087 redirecting to "/tmp/" from "/"
+2018/11/13 23:00:03.946093 http-file-server listening on ":8080"
+```
+
+```sh
+$ http-file-server -p 1234 /1=/tmp /2=/var/tmp
+2018/11/13 23:01:44.502240 serving local path "/tmp" on "/1/"
+2018/11/13 23:01:44.502274 serving local path "/var/tmp" on "/2/"
+2018/11/13 23:01:44.502280 redirecting to "/1/" from "/"
+2018/11/13 23:01:44.502285 http-file-server listening on ":1234"
+```
+
+```sh
+$ export PORT=9999
+$ http-file-server /abc/def/ghi=/tmp
+2018/11/13 23:05:52.291485 serving local path "/tmp" on "/abc/def/ghi/"
+2018/11/13 23:05:52.291606 redirecting to "/abc/def/ghi/" from "/"
+2018/11/13 23:05:52.291611 http-file-server listening on ":9999"
+```
+
+## Get it
+
+### Using `go get`
+
+```sh
+go get -u github.com/sgreben/http-file-server
+```
+
+### Pre-built binary
+
+Or [download a binary](https://github.com/sgreben/http-file-server/releases/latest) from the releases page, or from the shell:
+
+```sh
+# Linux
+curl -L https://github.com/sgreben/http-file-server/releases/download/1.0.0/http-file-server_1.0.0_linux_x86_64.tar.gz | tar xz
+
+# OS X
+curl -L https://github.com/sgreben/http-file-server/releases/download/1.0.0/http-file-server_1.0.0_osx_x86_64.tar.gz | tar xz
+
+# Windows
+curl -LO https://github.com/sgreben/http-file-server/releases/download/1.0.0/http-file-server_1.0.0_windows_x86_64.zip
+unzip versions_1.0.0_windows_x86_64.zip
+```
+
+## Use it
+
+```text
+http-file-server [OPTIONS] [[ROUTE=]PATH] [[ROUTE=]PATH...]
+```
+
+```text
+Usage of http-file-server:
+  -a string
+    	(alias for -addr) (default ":8080")
+  -addr string
+    	address to listen on (environment variable "ADDR") (default ":8080")
+  -p int
+    	(alias for -port)
+  -port int
+    	port to listen on (overrides -addr port) (environment variable "PORT")
+  -q	(alias for -quiet)
+  -quiet
+    	disable all log output (environment variable "QUIET")
+  -r value
+    	(alias for -route)
+  -route value
+    	a route definition ROUTE=PATH (ROUTE defaults to basename of PATH if omitted)
+```

README.template.md

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+# http-file-server
+
+`http-file-server` is a dependency-free HTTP file server.
+
+![screenshot](doc/screenshot.gif)
+
+## Contents
+
+<!-- TOC -->
+
+- [Contents](#contents)
+- [Examples](#examples)
+- [Get it](#get-it)
+    - [Using `go get`](#using-go-get)
+    - [Pre-built binary](#pre-built-binary)
+- [Use it](#use-it)
+
+<!-- /TOC -->
+
+
+## Examples
+
+```sh
+$ http-file-server /tmp
+2018/11/13 23:00:03.946051 serving local path "/tmp" on "/tmp/"
+2018/11/13 23:00:03.946087 redirecting to "/tmp/" from "/"
+2018/11/13 23:00:03.946093 http-file-server listening on ":8080"
+```
+
+```sh
+$ http-file-server -p 1234 /1=/tmp /2=/var/tmp
+2018/11/13 23:01:44.502240 serving local path "/tmp" on "/1/"
+2018/11/13 23:01:44.502274 serving local path "/var/tmp" on "/2/"
+2018/11/13 23:01:44.502280 redirecting to "/1/" from "/"
+2018/11/13 23:01:44.502285 http-file-server listening on ":1234"
+```
+
+```sh
+$ export PORT=9999
+$ http-file-server /abc/def/ghi=/tmp
+2018/11/13 23:05:52.291485 serving local path "/tmp" on "/abc/def/ghi/"
+2018/11/13 23:05:52.291606 redirecting to "/abc/def/ghi/" from "/"
+2018/11/13 23:05:52.291611 http-file-server listening on ":9999"
+```
+
+## Get it
+
+### Using `go get`
+
+```sh
+go get -u github.com/sgreben/http-file-server
+```
+
+### Pre-built binary
+
+Or [download a binary](https://github.com/sgreben/http-file-server/releases/latest) from the releases page, or from the shell:
+
+```sh
+# Linux
+curl -L https://github.com/sgreben/${APP}/releases/download/${VERSION}/${APP}_${VERSION}_linux_x86_64.tar.gz | tar xz
+
+# OS X
+curl -L https://github.com/sgreben/${APP}/releases/download/${VERSION}/${APP}_${VERSION}_osx_x86_64.tar.gz | tar xz
+
+# Windows
+curl -LO https://github.com/sgreben/${APP}/releases/download/${VERSION}/${APP}_${VERSION}_windows_x86_64.zip
+unzip versions_${VERSION}_windows_x86_64.zip
+```
+
+## Use it
+
+```text
+http-file-server [OPTIONS] [[ROUTE=]PATH] [[ROUTE=]PATH...]
+```
+
+```text
+${USAGE}
+```

main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+)
+
+const (
+	defaultAddr     = ":8080"
+	addrEnvVarName  = "ADDR"
+	portEnvVarName  = "PORT"
+	quietEnvVarName = "QUIET"
+	rootRoute       = "/"
+)
+
+var (
+	addrFlag      = os.Getenv(addrEnvVarName)
+	portFlag64, _ = strconv.ParseInt(os.Getenv(portEnvVarName), 10, 64)
+	portFlag      = int(portFlag64)
+	quietFlag     bool
+	routesFlag    routes
+)
+
+func init() {
+	log.SetFlags(log.LUTC | log.Ldate | log.Ltime)
+	log.SetOutput(os.Stderr)
+	if addrFlag == "" {
+		addrFlag = defaultAddr
+	}
+	flag.StringVar(&addrFlag, "addr", addrFlag, fmt.Sprintf("address to listen on (environment variable %q)", addrEnvVarName))
+	flag.StringVar(&addrFlag, "a", addrFlag, "(alias for -addr)")
+	flag.IntVar(&portFlag, "port", portFlag, fmt.Sprintf("port to listen on (overrides -addr port) (environment variable %q)", portEnvVarName))
+	flag.IntVar(&portFlag, "p", portFlag, "(alias for -port)")
+	flag.BoolVar(&quietFlag, "quiet", quietFlag, fmt.Sprintf("disable all log output (environment variable %q)", quietEnvVarName))
+	flag.BoolVar(&quietFlag, "q", quietFlag, "(alias for -quiet)")
+	flag.Var(&routesFlag, "route", routesFlag.help())
+	flag.Var(&routesFlag, "r", "(alias for -route)")
+	flag.Parse()
+	if quietFlag {
+		log.SetOutput(ioutil.Discard)
+	}
+	for i := 0; i < flag.NArg(); i++ {
+		arg := flag.Arg(i)
+		err := routesFlag.Set(arg)
+		if err != nil {
+			log.Fatalf("%q: %v", arg, err)
+		}
+	}
+}
+
+func main() {
+	addr, err := addr()
+	if err != nil {
+		log.Fatalf("address/port: %v", err)
+	}
+	err = server(addr, routesFlag)
+	if err != nil {
+		log.Fatalf("start server: %v", err)
+	}
+}
+
+func server(addr string, routes routes) error {
+	mux := http.DefaultServeMux
+	handlers := make(map[string]http.Handler)
+	paths := make(map[string]string)
+
+	if len(routes.Values) == 0 {
+		log.Printf("WARNING: no routes specified - every request will return %d (%s)", http.StatusNotFound, http.StatusText(http.StatusNotFound))
+		http.HandleFunc(rootRoute, http.NotFound)
+	}
+
+	for _, route := range routes.Values {
+		handlers[route.Route] = &fileHandler{
+			route: route.Route,
+			path:  route.Path,
+		}
+		paths[route.Route] = route.Path
+	}
+
+	for route, path := range paths {
+		mux.Handle(route, handlers[route])
+		log.Printf("serving local path %q on %q", path, route)
+	}
+
+	if _, ok := handlers[rootRoute]; !ok && len(routes.Values) > 0 {
+		route := routes.Values[0].Route
+		mux.Handle(rootRoute, http.RedirectHandler(route, http.StatusTemporaryRedirect))
+		log.Printf("redirecting to %q from %q", route, rootRoute)
+	}
+
+	binaryPath, _ := os.Executable()
+	if binaryPath == "" {
+		binaryPath = "server"
+	}
+	log.Printf("%s listening on %q", filepath.Base(binaryPath), addr)
+	return http.ListenAndServe(addr, mux)
+}
+
+func addr() (string, error) {
+	portSet := portFlag != 0
+	addrSet := addrFlag != ""
+	switch {
+	case portSet && addrSet:
+		a, err := net.ResolveTCPAddr("tcp", addrFlag)
+		if err != nil {
+			return "", err
+		}
+		a.Port = portFlag
+		return a.String(), nil
+	case !portSet && addrSet:
+		a, err := net.ResolveTCPAddr("tcp", addrFlag)
+		if err != nil {
+			return "", err
+		}
+		return a.String(), nil
+	case portSet && !addrSet:
+		return fmt.Sprintf(":%d", portFlag), nil
+	case !portSet && !addrSet:
+		fallthrough
+	default:
+		return defaultAddr, nil
+	}
+}