CodeChallenge3 - Search

CLI text search (of a remote file/URL) written in GO.

Basically a poor imitation of grep. It's for learning.

My demonstration video with narration.

Screengrab

Usage

Development

go run challenge3_search.go -query Force -source https://appdev-code-challenge.s3.amazonaws.com/challenge3_search/SW_EpisodeIV.txt

go run challenge3_search.go -h

Installed

go install will place the binary at $GOPATH/bin/, and if this is on your terminal's PATH, it can be invoked directly.

go install

challenge3_search -query Force -source https://appdev-code-challenge.s3.amazonaws.com/challenge3_search/SW_EpisodeIV.txt
challenge3_search -query Force -source https://appdev-code-challenge.s3.amazonaws.com/challenge3_search/SW_EpisodeV.txt
challenge3_search -query Force -source https://appdev-code-challenge.s3.amazonaws.com/challenge3_search/SW_EpisodeVI.txt

Things I Learned

• padding when printing to CLI, fmt.Printf(" %-7v ", fmt.Sprint(index))
• GO slices []string vs. [3]string, very important distinction. Slices are memory flexible, and centered around the pointer instead of copying an entire array of data. Read here for more.
• iterate over an array: for _, line := range stringArr {
• GO defer, A defer statement defers the execution of a function until the surrounding function returns
• flags.String(name, default, help msg), usefulf or CLI parameters, good link
• go mod init (package name),
  • for this project go mod init github.com/yamori/challenge3_search
  • where challenge3_search is the name of the entry file, convention
• go install
  • executed locally will install to $GOPATH/bin/, and if this is on PATH it can then be used immediately
• dependencies: go get github.com/gookit/color will add to go.mod automatically
• VSCode - go extensions, auto complete etc.