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23671: command not found handler

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Peter Stephenson 2007-07-13 10:09:06 +00:00
parent a1374319dc
commit eea6647c65
3 changed files with 41 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2007-07-13 Peter Stephenson <pws@csr.com>
* 23671: Doc/Zsh/exec.yo, Src/exec.c: Function
command_not_found_handler can be defined to handle command
not found.
2007-07-12 Clint Adams <clint@zsh.org>
* 23674: Completion/Unix/Command/_git: merge in git clone

12
Doc/Zsh/exec.yo
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@ -5,6 +5,8 @@ sect(Command Execution)
)\
cindex(command execution)
cindex(execution, of commands)
cindex(command not found, handling of)
findex(command_not_found_handler)
If a command name contains no slashes, the shell attempts to locate
it. If there exists a shell function by that name, the function
is invoked as described in noderef(Functions). If there exists
@ -23,3 +25,13 @@ is a file beginning with `tt(#!)', the remainder of the first line
specifies an interpreter for the program. The shell will
execute the specified interpreter on operating systems that do
not handle this executable format in the kernel.
If no external command is found but a function tt(command_not_found_handler)
exists the shell executes this function with all
command line arguments. The function should return status zero if it
successfully handled the command, or non-zero status if it failed.
In the latter case the standard handling is applied: `command not
found' is printed to standard error and the shell exits with status 127.
Note that the handler is executed in a subshell forked to execute
an external command, hence changes to directories, shell parameters,
etc. have no effect on the main shell.

23
Src/exec.c
View file

@ -468,6 +468,25 @@ isgooderr(int e, char *dir)
e != ENOENT && e != ENOTDIR);
}
/*
* Attempt to handle command not found.
* Return 0 if the condition was handled, non-zero otherwise.
*/
/**/
static int
commandnotfound(char *arg0, LinkList args)
{
Shfunc shf = (Shfunc)
shfunctab->getnode(shfunctab, "command_not_found_handler");
if (!shf)
return 127;
pushnode(args, arg0);
return doshfunc(shf->node.nam, shf->funcdef, args, shf->node.flags, 1);
}
/* execute an external command */
/**/
@ -562,6 +581,8 @@ execute(LinkList args, int flags, int defpath)
}
if (!ps) {
if (commandnotfound(arg0, args) == 0)
_exit(0);
zerr("command not found: %s", arg0);
_exit(127);
}
@ -624,6 +645,8 @@ execute(LinkList args, int flags, int defpath)
if (eno)
zerr("%e: %s", eno, arg0);
else if (commandnotfound(arg0, args) == 0)
_exit(0);
else
zerr("command not found: %s", arg0);
_exit((eno == EACCES || eno == ENOEXEC) ? 126 : 127);