How to figure out static dependencies of a library for example libxml-2.0

Alright, this is fairly common question when you are trying to generate a static binary or have come across situations when you want to find out all the dependencies of a library.

Example:
The problem: How the hell do I figure out all the static dependencies of libxml-2 ?

The solution: Its easy, use pkg-config !!

Here is how to list all the static dependencies of libxml-2

Run the below command:

pkg-config --static --libs libxml-2.0

and this returns a list

-lxml2 -lpthread -lz -lm

All permutation of a string using Go (Golang)

I have been playing around a bit with Golang and I thought the best way to learn about a prog. language is to write some code.

The problem: Write all permutations of a given string

The solution:

Run code here : http://play.golang.org/p/h4Kx6IS_lE

	package main
	import "fmt"
	/*
	Return all permutations of a string
	Example,
	Find all perm of abc:
	We will find all perms of the given string based on all perms of its substring
	To find all perms of abc, we need to find all perms of bc, and then add a to those perms
	To find all perms of bc, we need to find all perms of c, and add b to those perms
	To find all perms of c, well we know that is only c
	Now we can find all perms of bc, insert c at every available space in b
	bc --> bc, cb
	Now we need to add a to all perms of bc
	abc, bac, bca (insert a in bc) -- acb, cab, cba (insert a in cb)
	*/
	func main() {
	fmt.Printf("All perms are - %v", getPerms("abc"))
	}
	func getPerms(str string) []string {
	// base case, for one char, all perms are [char]
	if len(str) == 1 {
	return []string{str}
	}
	current := str[0:1] // current char
	remStr := str[1:] // remaining string
	perms := getPerms(remStr) // get perms for remaining string
	allPerms := make([]string, 0) // array to hold all perms of the string based on perms of substring
	// for every perm in the perms of substring
	for _, perm := range perms {
	// add current char at every possible position
	for i := 0; i <= len(perm); i++ {
	newPerm := insertAt(i, current, perm)
	allPerms = append(allPerms, newPerm)
	}
	}
	return allPerms
	}
	// Insert a char in a word
	func insertAt(i int, char string, perm string) string {
	start := perm[0:i]
	end := perm[i:len(perm)]
	return start + char + end
	}

view raw permutations.go hosted with ❤ by GitHub