init

LICENSE

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+Copyright (c) 2018, Stephen McQuay
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+    * Neither the name of authpixious nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# wch is just which
+
+I wanted to try my hand at another unix utility; this is it.

main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+var all = flag.Bool("a", false, "list all instances of executables found (instead of just the first one of each).")
+var silent = flag.Bool("s", false, "No output, just return 0 if all of the executables are found, or 1 if some were not found.")
+
+func main() {
+	flag.Parse()
+
+	paths := filepath.SplitList(os.Getenv("PATH"))
+
+	rc := 0
+	for _, cmd := range flag.Args() {
+		found := false
+		for _, dir := range paths {
+			path := filepath.Join(dir, cmd)
+			if err := findExecutable(path); err == nil {
+				found = true
+				if !*silent {
+					fmt.Println(path)
+				}
+				if !*all {
+					break
+				}
+			}
+		}
+		if !found {
+			if !*silent {
+				fmt.Printf("%v not found\n", cmd)
+			}
+			rc++
+		}
+	}
+	if rc > 0 {
+		rc = 1
+	}
+	os.Exit(rc)
+}
+
+// findExecutable is from the stdlib: https://golang.org/src/os/exec/lp_unix.go?s=458:647#L19
+func findExecutable(file string) error {
+	d, err := os.Stat(file)
+	if err != nil {
+		return err
+	}
+	if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
+		return nil
+	}
+	return os.ErrPermission
+}