Gets FIDASIM version number from git. Falls back to reading VERSION file when git is not available
fidasim_dir: FIDASIM install directory
IDL> version = get_version(getenv("FIDASIM_DIR"))
FUNCTION get_version, fidasim_dir ;+#get_version ;+ Gets FIDASIM version number from git. ;+ Falls back to reading VERSION file when git is not available ;+*** ;+##Input Arguments ;+ **fidasim_dir**: FIDASIM install directory ;+ ;+##Example Usage ;+```idl ;+IDL> version = get_version(getenv("FIDASIM_DIR")) ;+``` version = '' git_dir = fidasim_dir+'/.git' if strcmp(!VERSION.OS_FAMILY ,'windows', /fold_case) then begin spawn,'command -v git ',git_command endif else begin spawn,'command -v git ',git_command,/sh endelse if file_test(git_command) and file_test(git_dir,/dir) then begin spawn,git_command+' --git-dir='+git_dir+' describe --tags --always --dirty',version,err_status endif else begin version_file = fidasim_dir+'/VERSION' version = '' if file_test(version_file) then begin openr, lun, version_file, /get_lun readf, lun, version free_lun, lun endif endelse return, version END