Add command-line option to go to a specific line on startup

[parras]

E.g.:
$ dex +245 myfile
will open myfile with the cursor positioned on line 245.
This ensures compatibility with less.

[craigbarnes]

For single files, you can already use:

dex -c 'line 245' myfile

For multiple files you can use:

dex -c 'open file1; line 245; open file2; line 120'

Does this new flag handle opening multiple files or just the first?

[parras]

@craigbarnes, yes it is equivalent but note that:

1. the + syntax is a convenient shorthand
2. it ensures compatibility with less's v command:

Invokes an editor to edit the current file being viewed.

[pepa65]

I don't see this interfering with anything, especially since dte honours the -- flag in case you want to edit a file that starts with a +. The option of dex being set as less' editor is a nice feature.

[craigbarnes]

Only the first, which is consistent with the behavior of vim, nano and less.

I can't seem to make this option work at all with less (even with a single file) but nano seems to support using it for multiple files:

nano +500 src/edit.c +20 GNUmakefile +160 Documentation/dte.txt

I intend to implement this at some point in the dte fork (issue: craigbarnes/dte#16).

[pepa65]

Strange that less shouldn't work for you... Here it works, only for the first file, and nano indeed works with more than one.

[craigbarnes]

This is implemented in the dte fork now, in commit 22138515.