Discussion
Starting my study of the `grub-*` commands...
There's a shellscript `grub-reboot` which parses commandline args with a couple util functions, verifies that a menu entry was specified, fills in a missing bootdir, verifies results from `grub-probe`, & invokes `grub-editenv` once or thrice.
Another shellscript `grub-set-default` works extremely similarly.
`grub-script-check` zeroes out several properties, performs some OS-specific init, parses commandline flags, ...
1/?
... reads the file line-by-line handing off to GRUB's internal commandline to interpret them, & cleans up reporting any errors.
`grub_render_label` performs some OS-specific init, zeroes out some options, parses & validates commandline flags, sets or reads in text, performs various initialization, & hands off to `grub_util_render_label`.
`grub-syslinux2cfg` performs some OS-specific init, zeroes out some values, parses & validates commandline flags, performs various init, ...
2/5?
... normalizes a filepath into GRUB syntax, defers to `grub_syslinux_config_file`, & cleans up reporting any errors.
`grub-setup` performs some OS-specific init, sets various values mostly to 0, parses commandline flags, possibly sets $debug to "all", inits the BIOS-disk, performs various initialization & some finalization, parses the given device-name or loads a couple fallbacks, defers to a choice of core-routine I've already studied, & cleans up.
3/5?
`grub-file` performs some OS-specific init, handles "--version", iterates over commandline args copying each into newly-allocated memory normalizing the filepaths, inits more GRUB subsystems, sets $root to "host", & executes GRUB's builtin `file` command.
`grub-glue-efi` performs some OS specific init, zeroes out some values, parses & validates commandline flags, & defers to `grub_util_glue_efi`.
`grub-gen-widthspec` verifies there's 3 commandline args, inits FreeType, ...
4/5!
... uses it to open a font file, configures pixel sizes, iterates over each glyph deferring to a helper function for loading the glyph outputting any errors & flagging one which are too wide, cleans up, & outputs results.
The `grub-kbdcomp` shellscript parses (aided by a couple functions) & validates commandline flags before piping `ckbcomp` to `grub-mklayout`.
`grub-menulst2cfg` parses commandline args, reads & parses each line from input file reformatting into a new syntax, ...
6/6!!
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