Tracking PR for 1.8.x #271
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Now `require` is not an alias of `source` aymore.
`source`, like in bash, imports a script and gives it full
access to the global environment.
`require` instead imports the script, but does not allow it
to read or set variables at the global level. If a required
scripts needs to "pass" variables to the caller, it can simply
`return` them and they will be available to th caller.
Example -- say this is our module, `ip-finder.abs`:
```
return f() {
return `curl icanhazip.com`
}
```
Then we can simply use it like this:
```
ip_finder = require("ip-finder.abs")
echo("My IP is %s", ip_finder())
```
This PR adds support for negative indexes in arrays / strings. ``` bash [1,2,3][-1] #3 ``` There is one change that might alter existing ABS scripts, and that's non-existing indexes, for strings, returning an empty string rather than `null`. I believe it's an ok thing to break as both will evaluate to `false` when casted to boolean, and to check whether an index exists one can simply: * check the length of the string (`s.len()`) * check the boolean value of the index (`!!s[idx]`) both these examples do not break with these changes. I instead admit that it would be weird to see code such as: ``` bash if s[idx] == null { ... } ``` rather than ``` if !s[idx] { ... } ``` So I guess this is a change that can go through, as it really shouldn't impact much of the userbase.
We have been operating a fork due to #265
Now you can embed variables inside strings by prefixing them with
`$`. Literal `$` simply need a `\`. This aligns the string interpolation
syntax with commands, and makes it easier to switch between running
a command (`` `$some $command` ``) and echoing it (`echo("$some $command")`).
Arrays can now easily be formatted as TSV / CSV content:
```
array.tsv()
array.tsv(",")
```
Here are some samples:
```
⧐ [["LeBron", "James"], ["James", "Harden"]].tsv()
LeBron James
James Harden
⧐ [{"name": "Lebron", "last": "James", "jersey": 23}, {"name": "James", "last": "Harden"}].tsv("\t", ["name", "last", "jersey", "additional_key"])
name last jersey additional_key
Lebron James 23 null
James Harden null null
```
There is some complexity in this function due to the fact that
we have to support custom headers, as well as the fact that we
can both format arrays of objects as well as hashes.
* if the package file is not present, calls to `require` shouldn't fail
* a package `user/package` might contain different abs files (eg. `user/package/file.abs`). When we resolve calls to `require("package/file.abs")` we should only take `package`, and not the whole `package/file.abs`
* saving aliases was only working for the first package installed, now the installer will save all modules that are being installed locally
* when including a module, if a file is not specified (`require("module")`), we will try to load the `index.abs` file by default
… with a .abs file
|
@abs-lang/contributors this is going to get released tomorrow. |
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/cc @abs-lang/contributors