In Linux, support tab completion of several parameters

[yoavnir]

Specifically:

• Complete names of stored specifications after -f or --specfile
• Complete file names for -i or --inFile
• And --is*
• And -c or --config

[yoavnir]

How it's done:

• Some session initializer, typically bashrc should call complete -C specs-autocomplete specs
• Need to put specs-autocomplete in the path.
• specs-autocomplete` runs in a very specific environment
  • argc is always 4. Exit if not.
  • argv[1] is the command, usually specs
  • argv[2] is what we're completing - can be an empty string after a space, or whatever we have typed since the last space.
  • argv[3] The previous word
  • Env variable COMP_LINE contains all of the stuff on the commad line
  • Env variable COMP_POINT contains the offset (stringified integer) within the line where the cursor is. If it's at the end, then atoi(getenv("COMP_POINT")) == strlen(getenv("COMP_LINE"))
  • Env variable COMP_TYPE has several values:
    • 9 means normal, so if the user typed -f funclnf and the only specfile that starts with funclnf is funclnfreq, the program can output funclnfreq.
    • 63 means tabbing between ambiguous options, so if the user typed -f func and there are both funclnfreq and funcfreq, the program can output funcfreq funclnfreq.
    • 33 when listing alternatives on ambiguous completions
    • 37 for menu completion,
    • 64 to list completions after a partial completion

[yoavnir]

You want to use getFullSpecPath() to get the path, and then search using std::filesystem to get all the some of the files.

As long as we're auto-completing (for -f both from the SPECSPATH and from current directory, for -o ad -i only from current directory). But should also consider what has already been typed...

[yoavnir]

Maybe use this for multi-compare

std::set<std::string> e{"one", "two", "three", "five", "eight"};

Do it all lower-case and convert the prevToken to lowercase before passing it?

[yoavnir]

I will leave this issue open until I've verified that it works on Ubuntu 24