textvars.ReplaceVar(`Hey {Name}!`, "Name", "Joe")
// "Hey Joe!"

textvars.ReplaceVar(`Hey {Name}!`, "Name", "")
// "Hey!" 👍

strings.ReplaceAll(`Hey {Name}!`, "{Name}", "")
// "Hey !" 🫤

Example: Leading comma:

textvars.ReplaceVar(`Apples,{Fruit},Bananas`, "Fruit", "Oranges")
// "Apples,Oranges,Bananas"

textvars.ReplaceVar(`Apples,{Fruit},Bananas`, "Fruit", "")
// "Apples,Bananas" 👍

strings.ReplaceAll(`Apples,{Fruit},Bananas`, "{Fruit}", "")
// "Apples,,Bananas" 🫤

Example: Multiple Vars

tmpl := `{#}. {Name}`
vars := map[string]string{
    "#": "1",
    "Name": "Joe",
}
text, err := textvars.ReplaceVars(tmpl, vars)
// "1. Joe"
// errors if any {...} are left over

Note: This is the sort of thing that's it's probably better to copy and paste rather than to have as a dependency, but I wanted to have it for myself as a convenience in my own repo of tools, so here it is.

Other Uses

It seemed like an okay idea at the time, so I also baked in some other uses:

Syntax	Example	"Joe"	Empty ("")	Comment
`{Name}`	`Hey {Name}!`	`Hey Joe!`	`Hey!`	cuts left character if empty
`{Name-}`	`1,{Name-},3`	`1,Joe,3`	`1,3`	cuts right character if empty
`{-Name-}`	`Hey! {Name}!`	`Hey! Joe!`	`Hey!`	cuts left and right if empty
`{+Name}`	`Name:{+Name}`	`Name:Joe`	`Name:`	keeps left character always

However, I haven't actually had the use case for those yet and you probably won't either... so don't use what you don't need. 🙃

I DO NOT plan on making a robust template system. I was only interested in solving the leading space / trailing comma problem for sendsms.

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