Prevent multiple AIRACs being read

README.md

@@ -32,11 +32,16 @@ Larry Benwater
 ```
 
 ## Usage
-The easiest way to use this is copy and paste the desired changelog list from [https://raw.githubusercontent.com/VATSIM-UK/UK-Sector-File/main/.github/CHANGELOG.md](https://raw.githubusercontent.com/VATSIM-UK/UK-Sector-File/main/.github/CHANGELOG.md) into a `changelog.md` file locally, and just run with `./UKSFCG`
+There are two ways to use this program:
+- Locally - copy and paste the desired changelog list from [https://raw.githubusercontent.com/VATSIM-UK/UK-Sector-File/main/.github/CHANGELOG.md](https://raw.githubusercontent.com/VATSIM-UK/UK-Sector-File/main/.github/CHANGELOG.md) into a `changelog.md` file locally, and just run with `./UKSFCG`
+- Online - run the program using `./UKSFCG --url`, which will read from the default URL specified below
 
 Flags:
 - `--in` - sets the input file, optional, default `changelog.md`
 - `--out` - sets the output file, optional, default `output.txt`
+- `--url` - sets the url, optional, if `--url` is present but empty then it defaults to `https://raw.githubusercontent.com/VATSIM-UK/UK-Sector-File/main/.github/CHANGELOG.md` 
+
+The `--url` flag takes precedence over `--in`, so if both are specified, then it will read from online.
 
 ## Limitations
 - If a contributor has been added in the format `- thanks to @John (John Smith) and Smith John`, Smith John would not be on the contributors list

go.mod

@@ -6,6 +6,8 @@ require github.com/stretchr/testify v1.8.1
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/jessevdk/go-flags v1.5.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,6 +1,8 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/jessevdk/go-flags v1.5.0 h1:1jKYvbxEjfUl0fmqTCOfonvskHHXMjBySTLW4y9LFvc=
+github.com/jessevdk/go-flags v1.5.0/go.mod h1:Fw0T6WPc1dYxT4mKEZRfG5kJhaTDP9pj1c2EWnYs/m4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -10,6 +12,8 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 h1:EZ2mChiOa8udjfp6rRmswTbtZN/QzUQp4ptM4rnjHvc=
+golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -98,9 +98,16 @@ func GetWebChangelog(urls string) []byte {
 func GetChanges(filebytes []byte) []string {
 	changes := []string{}
 	split := strings.Split(string(filebytes), "\n") // split the document into newlines
+	airacnumbers := 0
 	numberReComp := regexp.MustCompile(numberRe)
 	for _, s := range split {
-		b := numberReComp.MatchString(s) // ensures that it isn't the AIRAC title
+		if airacnumbers >= 2 {
+			break // if we go through multiple AIRACs then stop
+		}
+		if strings.Contains(s, "#") {
+			airacnumbers = airacnumbers + 1
+		}
+		b := numberReComp.MatchString(s) // only match changelog entries
 		if b {
 			s = numberReComp.ReplaceAllString(s, "") // removes the number from the start
 			changes = append(changes, s)