Examples

Short useful examples with explanations

List all top level functions in NGS

ngs -pi 'globals().filterv(Fun)'

• globals() returns a Hash of all global variables
• filterv() filters a Hash by predicate applied to values, resulting a new Hash
• Fun - the function type (callable)
• A type t, when used as predicate act as F(x) x is t, a predicate

Match all occurrences of a regular expression

Get all certificates from a certificate chain

certs = read(fileName) ~~ /-----BEGIN CERTIFICATE-----.*?-----END CERTIFICATE-----/ms

• read(fileName) returns the whole content of the file
• ~ - match operator, returns a subtype of MatchResult (either MatchSuccess or MatchFailure)
• ~~ - match all operator, returns possibly empty array of MatchSuccess objects

Parse openssl output (subject), convert to a Hash

subject = (`echo ${cert} | openssl x509 -subject -noout` - Sfx("\n") - Pfx("subject= /")).split("/").map(split(X, "=")).Hash()

• `...` runs a command and captures the output, similar to bash
• - Sfx("\n") removes newline at the end
• - Pfx("subject= /") removes undesired prefix of the string
• .split("/") splits the line by /, resulting an array of strings
• .map(split(X, "=")) splits each string in the array, resulting an array of the form [["k1", "v1"], ["k2, "v2"]]
• .Hash() converts array of the form [["k1", "v1"], ["k2, "v2"]] to a Hash