319 lines
9.3 KiB
Go
319 lines
9.3 KiB
Go
package main
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strings"
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kingpin "gopkg.in/alecthomas/kingpin.v2"
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)
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// VERSION The version release
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const VERSION = "0.1.0"
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// AUTHOR The author name
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const AUTHOR = "Elia el Lazkani"
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var (
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switchesFlags = []string{"m", "u", "M", "0", "1", "2", "A", "F", "n", "q", "Q", "T", "p"}
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)
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// We create a weather struct with the url
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type weather struct {
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url string
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}
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// `weather` method to handle creating new requests with proper headers
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func (w weather) newRequest(headers map[string]string) *http.Request {
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req, err := http.NewRequest("GET", w.url, nil)
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if err != nil {
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log.Fatal("Error reading request. ", err)
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}
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return w.formatHeader(req, headers)
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}
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// `weather` method to format the headers and inject required ones
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func (w weather) formatHeader(req *http.Request, headers map[string]string) *http.Request {
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req.Header.Set("Content-Type", "text/plain; charset=utf-8")
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// I had to read the wttr.in code to figure this one out.
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// It wasn't Golang, it was 2 wasted hours that I won't be getting back.
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req.Header.Set("User-Agent", "curl")
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for key, value := range headers {
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req.Header.Add(key, value)
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}
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return req
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}
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// `weather` method to create a client and get a weather response
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// This method handles printing or downloading the weather
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func (w weather) get(req *http.Request, download bool) {
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client := &http.Client{}
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client.Jar = nil
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resp, err := client.Do(req)
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if err != nil {
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log.Fatal("Error reading response. ", err)
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}
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defer resp.Body.Close()
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if download {
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w.download(resp)
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} else {
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w.print(resp)
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}
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}
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// `weather` method to print the weather
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func (w weather) print(resp *http.Response) {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Fatal("Error reading body. ", err)
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}
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fmt.Printf("%s", body)
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}
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// `weather` method to download the weather
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func (w weather) download(resp *http.Response) {
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var fName string
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if *fileName != "" {
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fName = *fileName
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} else {
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splitURL := strings.Split(w.url, "/")
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fName = splitURL[len(splitURL)-1]
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}
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f, err := os.Create(fName)
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if err != nil {
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log.Fatal("Error opening file. ", err)
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}
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defer f.Close()
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_, err = io.Copy(f, resp.Body)
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}
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// Wraper function around the weather struct
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func getWheather(url string, headers map[string]string, download bool) {
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w := weather{url}
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req := w.newRequest(headers)
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w.get(req, download)
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}
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// Create a method to figure out the command parameters
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// provided and translate them into uri parameters.
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// This will figure out if we need to download the PNG image
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// as well.
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func generateParamFormat() (string, bool, error) {
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var params strings.Builder
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var prefix = "?"
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var downloadMode = *download
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// If --free-syle is specified, let's not bother and simply return it
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if *freeStyle != "" {
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return *freeStyle, downloadMode, nil
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}
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// If --format is specified, let's return the format the user wants
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if *format != "" {
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var str strings.Builder
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str.WriteString("?format=\"")
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str.WriteString(*format)
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str.WriteString("\"")
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return str.String(), downloadMode, nil
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}
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// If --one-liner is specified, we know the format is set so let's return it
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if *oneLiner {
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return "?format=3", downloadMode, nil
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}
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for i, s := range switches {
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if *s {
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params.WriteString(switchesFlags[i])
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}
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}
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if *png {
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prefix = "_"
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if *addFrame {
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params.WriteString(switchesFlags[12])
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}
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if *transparency >= 0 && *transparency <= 255 {
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params.WriteString("_transparency=")
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params.WriteString(string(*transparency))
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}
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params.WriteString(".png")
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downloadMode = true
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}
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var affix strings.Builder
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affix.WriteString(prefix)
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affix.WriteString(params.String())
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return affix.String(), downloadMode, nil
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}
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// Defining the command-line interface
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var (
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app = kingpin.New("go-cmw", "A small terminal wrapper around the wttr.in weather endpoint.")
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location = app.Flag("location", "Specify explicite location (--expert-mode)").Short('L').OverrideDefaultFromEnvar("GO_CMW_LOCATION").String()
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language = app.Flag("language", "Specify explicite language (--expert-mode)").Short('l').OverrideDefaultFromEnvar("GO_CMW_LANGUAGE").String()
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v2 = app.Flag("v2", "Display Data-Rich output").Default("false").Bool()
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switches = []*bool{
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app.Flag("metric", "Display weather in metric").Short('m').Default("false").Bool(),
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app.Flag("uscs", "Display weather in imperial").Short('u').Default("false").Bool(),
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app.Flag("meter-second", "Display wind in m/s").Short('M').Default("false").Bool(),
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app.Flag("zero", "Display current weather").Short('z').Default("false").Bool(),
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app.Flag("one", "Display current weather + 1 day").Short('o').Default("false").Bool(),
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app.Flag("two", "Display current weather + 2 days").Short('w').Default("false").Bool(),
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app.Flag("ignore-user-agent", "Ignore User-Agent and force ANSI output").Short('A').Default("false").Bool(),
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app.Flag("follow-link", "Do not display the 'Follow' line").Short('F').Default("true").Bool(),
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app.Flag("narrow", "Display narrow view (only day/night)").Short('n').Default("false").Bool(),
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app.Flag("quiet", "Display quiet version (no weather report)").Short('q').Default("false").Bool(),
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app.Flag("super-quiet", "Display super quiet version (no weather report and no city)").Short('Q').Default("false").Bool(),
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app.Flag("no-colors", "Display no colors (always enabled on windows").Short('N').Default("false").Bool()}
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png = app.Flag("png", "Download a weather PNG image").Short('P').Default("false").Bool()
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addFrame = app.Flag("add-frame", "Add a frame to the output (PNG only)").Short('p').Default("false").Bool()
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transparency = app.Flag("transparency", "Set transparency level (0-255) (PNG only) (--expert-mode)").OverrideDefaultFromEnvar("GO_CMW_TRANSPARENCY").Short('t').Default("0").Int()
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download = app.Flag("download", "Enables download mode (--expert-mode)").Short('d').Default("false").Bool()
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fileName = app.Flag("file-name", "Name download file (--expert-mode)").OverrideDefaultFromEnvar("GO_CMW_FILE_NAME").Default("").String()
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oneLiner = app.Flag("one-liner", "One liner outpet (for the terminal multiplexer lovers out there)").Short('O').Default("false").Bool()
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format = app.Flag("format", "Specify a format query (e.g. \"%l:+%c+%t\") (--expert-mode)").OverrideDefaultFromEnvar("GO_CMW_FORMAT").String()
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freeStyle = app.Flag("free-style", "Specify a free-style API call (--expert-mode)").OverrideDefaultFromEnvar("GO_CMW_FREE_STYLE").String()
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expertMode = app.Flag("expert-mode", "Print expert mode information").Default("false").Bool()
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)
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// Special help menu
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func printExpertMode() {
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eInfo := `
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Expert Mode
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-----------
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All commands flagged with --expert-mode override
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values/flags added by go-cmw.
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This gives the user full control over
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the queries requested.
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Environment Variables
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---------------------
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go-cmw makes use of the following environment
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variables:
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* GO_CMW_LOCATION for --location
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* GO_CMW_LANGUAGE for --language
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* GO_CMW_FORMAT for --format
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* GO_CMW_FREE_STYLE for --free-style
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* GO_CMW_FILE_NAME for --file-name
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* GO_CMW_TRANSPARENCY for --transparency
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Supported Location Types
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------------------------
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City name: Paris
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Unicode name: Москва
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Airport code (3 letters): muc
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Domain name: @stackoverflow.com
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Area code: 94107
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GPS coordinates: -78.46,106.79
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Special Location
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----------------
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Moon phase (add ,+US or
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,+France for these cities): moon
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Moon phase for a date: moon@2016-10-25
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Format Flags (--format)
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------------
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c Weather condition
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C Weather condition textual name
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h Humidity
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t Temperature
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w Wind
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l Location
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m Moonphase
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M Moonday
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p precipitation (mm)
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o Probability of Precipitation
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P pressure (hPa)
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Supported languages
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-------------------
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Supported: af be ca da de el et fr fa hu id it
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nb nl pl pt-br ro ru tr th uk vi
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zh-cn zh-tw
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`
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println(eInfo)
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}
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// Create a function to parse all the command line parameters
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// provided.
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func flagParser() {
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app.Version(VERSION)
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app.Author(AUTHOR)
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kingpin.MustParse(app.Parse(os.Args[1:]))
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if *expertMode {
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printExpertMode()
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os.Exit(0)
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}
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// Windows terminal does not have color encoding
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// so let's make sure windows users are happy
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if os.Getenv("TERM") == "" && !*png && *format != "" && *freeStyle != "" {
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*switches[11] = true
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}
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}
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// Create a function to generate the url that we'll be calling shortly.
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func generateURL(domain string, v2 bool, location string, lang string, affix string) (string, map[string]string) {
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var link strings.Builder
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var headers = make(map[string]string)
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link.WriteString("https://")
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if v2 {
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link.WriteString("v2.")
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}
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link.WriteString(domain)
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link.WriteString("/")
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if location != "" {
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link.WriteString(location)
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}
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if affix != "" {
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link.WriteString(affix)
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}
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if lang != "" {
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headers["Accept-Language"] = lang
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}
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return link.String(), headers
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}
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// This is the main function that glues everything together.
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func main() {
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var domain string = "wttr.in"
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flagParser()
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affix, downloadFile, _ := generateParamFormat()
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link, headers := generateURL(domain, *v2, *location, *language, affix)
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getWheather(link, headers, downloadFile)
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}
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