How to create a suffix alias for files without an extension? - macos

Question

I just found about zsh suffix aliases that allow one to associate a program with an extension in the shell:
alias -s {md,txt}=nano
Is there a way to do something like this but for file that do not have an extension?
I've tried:
alias -s {}=nano
But if I then try to use it, I get a command not found error:
> alias -s {}=nano
> touch file_without_extension
> file_without_extension
zsh: command not found: file_without_extension

Answer 1

Suffix aliases require a filename extension. You can use a command_not_found_handler function to work around that, though:
# Run this from a zsh prompt or put it in a file and source it
command_not_found_handler() {
# If just the name of an existing file is given, with no extra arguments
# open it in nano. Otherwise, print a message to stderr and return an error.
if [[ $# -eq 1 && -f $1 ]]; then
nano "$1"
else
print -u2 -f "command not found: %s\n" "$1"
return 127
fi
}
# Then with the function loaded:
$ file_without_extension # Opens in nano
$ file_that_doesnt_exist
command not found: file_that_doesnt_exist
$ file_without_extension blah
command not found: file_without_extension

Answer 2

base on the above answer:
with vim conceal:
command_not_found_handler() {
if [[ $# -eq 1 && -f $1 ]]; then
echo "leo test________________"
vim "$1"
else
print -u2 -f "command not found: %s\n" "$1"
# -u n Print the arguments to file descriptor n.
# 2 : stderr
return 127 # return an error.
fi
echo "aaaaaaaaaa leo test________________"
}
# 名字不能改
#
# (Nearly) All about this from man zshmisc (modified by me for easier understanding)
# If a command name contains no ✌/✌
# the shell attempts to locate it:
# If there exists a shell function by that name,
# the function is invoked as described in the section `Func‐ tions'.
# If there exists a shell ✌builtin✌ by that name,
# the builtin is invoked.
#
# contains ✌/✌
# the shell searches for a ✌directory✌ containing an executable file
# searche ✌by that name✌.
searches # in each element of $path
#
# if the search is successful
# if execution ✌fails✌ because the file is not in ✌executable format✌,
# and the file is ✌not a directory✌,
# it is assumed to be a shell script.
# /bin/sh is ✌spawned✌ to execute it.
# If the program is a file beginning with `#!',
# the remainder of the first line specifies an interpreter for the program.
# The shell will execute the specified interpreter,
# which do not handle this executable format in the ✌kernel✌ ,
# on ✌operating systems✌
#
# else (the search fails)
# the shell prints an error message and returns a nonzero exit status.
#
# If no external command is found
# but a function ✌command_not_found_handler✌ exists
# the shell executes this function with all command line arguments.
# The return status of the function becomes the status of the command.
#
# If the function wishes to mimic the behaviour of the shell when the command is not found,
# it should print the message `command not found: cmd'
# to standard error and return status 127.
#
# Note that the handler is executed in a subshell forked to execute an external command,
# hence changes to directories,
# shell parame‐ ters,
# have no effect on the main shel
#
# vim:ft=zsh