todos.sh, across files
======================

`todos.sh` takes several files, and names each one's file on its lines.

Each case below starts with its `CASE/mine.txt`, and `test-todos-files.sh` hands `todos.sh` two files:
that one, as `mine.txt`, and `shared/theirs.txt`, which every case shares, as `theirs.txt`.
What `todos.sh` prints is checked against `CASE/output`.

[testmark]:# (shared/theirs.txt)
```text
TODO: theirs, first
done: theirs, second
```


### files are listed in the order given

[testmark]:# (ordered/mine.txt)
```text
TODO: mine
```

[testmark]:# (ordered/output)
```text
mine.txt:1:TODO: mine
theirs.txt:1:TODO: theirs, first
```


### a file with nothing to do adds nothing

[testmark]:# (empty/mine.txt)
```text
```

[testmark]:# (empty/output)
```text
theirs.txt:1:TODO: theirs, first
```