|
| 1 | +///usr/bin/env true; exec /usr/bin/env go run "$0" "$@" |
| 2 | +package main |
| 3 | + |
| 4 | +import ( |
| 5 | + "context" |
| 6 | + "fmt" |
| 7 | + "io" |
| 8 | + "net/http" |
| 9 | + "os" |
| 10 | + "os/exec" |
| 11 | + "os/signal" |
| 12 | + "path" |
| 13 | + "strings" |
| 14 | + "sync" |
| 15 | + "syscall" |
| 16 | + "time" |
| 17 | + |
| 18 | + "github.com/tzvetkoff-go/optparse" |
| 19 | + |
| 20 | + "github.com/tzvetkoff-go/fnmatch" |
| 21 | + "github.com/tzvetkoff-go/nwatch/pkg/watcher" |
| 22 | +) |
| 23 | + |
| 24 | +// usage ... |
| 25 | +func usage(f io.Writer, name string) { |
| 26 | + fmt.Fprintln(f, "Usage:") |
| 27 | + fmt.Fprintf(f, " %s [options]\n", name) |
| 28 | + fmt.Fprintln(f) |
| 29 | + |
| 30 | + fmt.Fprintln(f, "Options:") |
| 31 | + fmt.Fprintln(f, " -h, --help Print help and exit") |
| 32 | + fmt.Fprintln(f, " -v, --version Print version and exit") |
| 33 | + fmt.Fprintln(f, " -V, --verbose Verbose output") |
| 34 | + fmt.Fprintln(f, " -d DIR, --directory=DIR Directories to watch") |
| 35 | + fmt.Fprintln(f, " -e EXC, --exclude-dir=EXC Directories to exclude") |
| 36 | + fmt.Fprintln(f, " -p PAT, --pattern=PAT File patterns to match") |
| 37 | + fmt.Fprintln(f, " -i IGN, --ignore=IGN File patterns to ignore") |
| 38 | + fmt.Fprintln(f, " -b BLD, --build=BLD Build command to execute") |
| 39 | + fmt.Fprintln(f, " -s SRV, --server=SRV Server command to run after successful build") |
| 40 | + fmt.Fprintln(f, " -w ERR, --error-server=ERR Web server address in case of an error") |
| 41 | + |
| 42 | + if f == os.Stderr { |
| 43 | + os.Exit(1) |
| 44 | + } |
| 45 | + |
| 46 | + os.Exit(0) |
| 47 | +} |
| 48 | + |
| 49 | +// mu ... |
| 50 | +var mu sync.Mutex |
| 51 | + |
| 52 | +// lastBuildOutput ... |
| 53 | +var lastBuildOutput []byte |
| 54 | + |
| 55 | +// runBuild ... |
| 56 | +func runBuild(command string) error { |
| 57 | + mu.Lock() |
| 58 | + defer mu.Unlock() |
| 59 | + |
| 60 | + verbose("runBuild: %s", command) |
| 61 | + |
| 62 | + cmd := exec.Command("/bin/sh", "-c", command) |
| 63 | + out, err := cmd.CombinedOutput() |
| 64 | + if err != nil { |
| 65 | + lastBuildOutput = out |
| 66 | + fmt.Fprintln(os.Stderr, "-------- build error: --------") |
| 67 | + fmt.Fprintln(os.Stderr, strings.TrimSpace(string(out))) |
| 68 | + fmt.Fprintln(os.Stderr, "------------------------------") |
| 69 | + } |
| 70 | + |
| 71 | + return err |
| 72 | +} |
| 73 | + |
| 74 | +// serverCmd ... |
| 75 | +var serverCmd *exec.Cmd |
| 76 | + |
| 77 | +// runServer ... |
| 78 | +func runServer(command string) { |
| 79 | + mu.Lock() |
| 80 | + defer mu.Unlock() |
| 81 | + |
| 82 | + verbose("runServer: %s", command) |
| 83 | + |
| 84 | + if serverCmd != nil && serverCmd.Process != nil { |
| 85 | + _ = serverCmd.Process.Kill() |
| 86 | + serverCmd.Process.Wait() |
| 87 | + serverCmd = nil |
| 88 | + } |
| 89 | + |
| 90 | + if errorServerChan != nil { |
| 91 | + errorServerChan <- true |
| 92 | + if errorServerChan != nil { |
| 93 | + close(errorServerChan) |
| 94 | + } |
| 95 | + errorServerChan = nil |
| 96 | + } |
| 97 | + |
| 98 | + serverCmd = exec.Command("/bin/sh", "-c", command) |
| 99 | + serverCmd.Stdout = os.Stdout |
| 100 | + serverCmd.Stderr = os.Stderr |
| 101 | + err := serverCmd.Start() |
| 102 | + if err != nil { |
| 103 | + serverCmd = nil |
| 104 | + fmt.Fprintln(os.Stderr, "-------- server error: --------") |
| 105 | + fmt.Fprintln(os.Stderr, strings.TrimSpace(err.Error())) |
| 106 | + fmt.Fprintln(os.Stderr, "-------------------------------") |
| 107 | + } |
| 108 | +} |
| 109 | + |
| 110 | +// errorServerChan ... |
| 111 | +var errorServerChan chan bool |
| 112 | + |
| 113 | +// runErrorServer ... |
| 114 | +func runErrorServer(address string) { |
| 115 | + mu.Lock() |
| 116 | + defer mu.Unlock() |
| 117 | + |
| 118 | + verbose("runErrorServer: %s", address) |
| 119 | + |
| 120 | + if serverCmd != nil && serverCmd.Process != nil { |
| 121 | + _ = serverCmd.Process.Kill() |
| 122 | + serverCmd.Process.Wait() |
| 123 | + serverCmd = nil |
| 124 | + } |
| 125 | + |
| 126 | + if errorServerChan != nil { |
| 127 | + errorServerChan <- true |
| 128 | + if errorServerChan != nil { |
| 129 | + close(errorServerChan) |
| 130 | + } |
| 131 | + errorServerChan = nil |
| 132 | + } |
| 133 | + |
| 134 | + s := &http.Server{ |
| 135 | + Addr: address, |
| 136 | + Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 137 | + w.Header().Add("Content-Type", "text/plain") |
| 138 | + w.Write(lastBuildOutput) |
| 139 | + }), |
| 140 | + } |
| 141 | + errorServerChan = make(chan bool, 1) |
| 142 | + go func() { |
| 143 | + <-errorServerChan |
| 144 | + if errorServerChan != nil { |
| 145 | + close(errorServerChan) |
| 146 | + } |
| 147 | + errorServerChan = nil |
| 148 | + s.Shutdown(context.TODO()) |
| 149 | + }() |
| 150 | + go func() { |
| 151 | + e := s.ListenAndServe() |
| 152 | + fmt.Println(e) |
| 153 | + }() |
| 154 | +} |
| 155 | + |
| 156 | +// matchAny ... |
| 157 | +func matchAny(s string, patterns []string) bool { |
| 158 | + for _, pattern := range patterns { |
| 159 | + if fnmatch.Match(pattern, s) { |
| 160 | + return true |
| 161 | + } |
| 162 | + } |
| 163 | + |
| 164 | + return false |
| 165 | +} |
| 166 | + |
| 167 | +// pVerbose ... |
| 168 | +var pVerbose = optparse.Bool("verbose", 'V', false) |
| 169 | + |
| 170 | +// verbose ... |
| 171 | +func verbose(format string, args ...interface{}) { |
| 172 | + if *pVerbose { |
| 173 | + fmt.Fprintf(os.Stderr, ">> "+format+"\n", args...) |
| 174 | + } |
| 175 | +} |
| 176 | + |
| 177 | +// main ... |
| 178 | +func main() { |
| 179 | + // Options |
| 180 | + pHelp := optparse.Bool("help", 'h', false) |
| 181 | + pVersion := optparse.Bool("version", 'v', false) |
| 182 | + pDirectories := optparse.StringList("directory", 'd') |
| 183 | + pExcludes := optparse.StringList("exclude", 'e') |
| 184 | + pPatterns := optparse.StringList("pattern", 'p') |
| 185 | + pIgnores := optparse.StringList("ignore", 'i') |
| 186 | + pBuild := optparse.String("build", 'b', "") |
| 187 | + pServer := optparse.String("server", 's', "") |
| 188 | + pErrorServer := optparse.String("error-server", 'w', "") |
| 189 | + |
| 190 | + // Parse |
| 191 | + args, err := optparse.Parse() |
| 192 | + if err != nil { |
| 193 | + fmt.Fprintf(os.Stderr, "%s: %s\n\n", os.Args[0], err.Error()) |
| 194 | + usage(os.Stderr, os.Args[0]) |
| 195 | + } |
| 196 | + |
| 197 | + // We don't accept positional arguments |
| 198 | + if len(args) != 0 { |
| 199 | + fmt.Fprintf(os.Stderr, "%s: wrong number of arguments (given %d, expected %d)\n\n", os.Args[0], len(args), 0) |
| 200 | + usage(os.Stderr, os.Args[0]) |
| 201 | + } |
| 202 | + |
| 203 | + // Help |
| 204 | + if *pHelp { |
| 205 | + usage(os.Stdout, os.Args[0]) |
| 206 | + } |
| 207 | + |
| 208 | + // Version |
| 209 | + if *pVersion { |
| 210 | + fmt.Println("0.1.0") |
| 211 | + os.Exit(0) |
| 212 | + } |
| 213 | + |
| 214 | + // Default to current directory |
| 215 | + if len(*pDirectories) == 0 { |
| 216 | + *pDirectories = []string{"."} |
| 217 | + } |
| 218 | + |
| 219 | + // Default to * |
| 220 | + if len(*pPatterns) == 0 { |
| 221 | + *pPatterns = []string{"*"} |
| 222 | + } |
| 223 | + |
| 224 | + // Build command is required |
| 225 | + if *pBuild == "" { |
| 226 | + fmt.Fprintf(os.Stderr, "%s: --build is required\n\n", os.Args[0]) |
| 227 | + usage(os.Stderr, os.Args[0]) |
| 228 | + } |
| 229 | + |
| 230 | + // Create watcher |
| 231 | + watcher, err := watcher.NewWatcher(*pExcludes) |
| 232 | + if err != nil { |
| 233 | + panic(err) |
| 234 | + } |
| 235 | + |
| 236 | + // Watch in the background |
| 237 | + go func() { |
| 238 | + ticker := time.Tick(100 * time.Millisecond) |
| 239 | + hasChanges := false |
| 240 | + |
| 241 | + for { |
| 242 | + select { |
| 243 | + case evt := <-watcher.Events: |
| 244 | + verbose("evt: %s", evt) |
| 245 | + |
| 246 | + basename := path.Base(evt) |
| 247 | + |
| 248 | + if !matchAny(basename, *pPatterns) { |
| 249 | + verbose("no-match: %q does not match any of %q", basename, *pPatterns) |
| 250 | + continue |
| 251 | + } |
| 252 | + if matchAny(basename, *pIgnores) { |
| 253 | + verbose("match-ignore: %q matches at least one of %q", basename, *pIgnores) |
| 254 | + continue |
| 255 | + } |
| 256 | + |
| 257 | + hasChanges = true |
| 258 | + case <-ticker: |
| 259 | + if hasChanges { |
| 260 | + hasChanges = false |
| 261 | + |
| 262 | + if runBuild(*pBuild) == nil && *pServer != "" { |
| 263 | + runServer(*pServer) |
| 264 | + } else if *pErrorServer != "" { |
| 265 | + runErrorServer(*pErrorServer) |
| 266 | + } |
| 267 | + } |
| 268 | + } |
| 269 | + } |
| 270 | + }() |
| 271 | + |
| 272 | + // Exit strategy |
| 273 | + ch := make(chan os.Signal) |
| 274 | + go func() { |
| 275 | + <-ch |
| 276 | + fmt.Println("\nAborting...") |
| 277 | + watcher.Close() |
| 278 | + }() |
| 279 | + signal.Notify(ch, syscall.SIGINT) |
| 280 | + signal.Notify(ch, syscall.SIGTERM) |
| 281 | + |
| 282 | + // Run initial build if we have a server command passed |
| 283 | + if *pServer != "" && runBuild(*pBuild) == nil { |
| 284 | + runServer(*pServer) |
| 285 | + } else if *pErrorServer != "" { |
| 286 | + runErrorServer(*pErrorServer) |
| 287 | + } |
| 288 | + |
| 289 | + // Add directories to watch |
| 290 | + for _, directory := range *pDirectories { |
| 291 | + watcher.Add(directory) |
| 292 | + } |
| 293 | + |
| 294 | + // Finally, watch |
| 295 | + watcher.Run() |
| 296 | +} |
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