~/rep > make                                                                                                                                     emiller at emiller-mac (main)
cc -g -O2 -o rep rep.c
rep.c:406:17: error: implicit declaration of function 'recv' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    int count = recv(reader->fd, &ch, 1, 0);
                ^
rep.c:626:20: error: incomplete result type 'struct sockaddr_in' in function definition
struct sockaddr_in options_address_from_file(struct options* options, const char* filename)
                   ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:631:12: error: calling 'options_address' with incomplete return type 'struct sockaddr_in'
    return options_address(options, linebuffer);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
rep.c:610:20: note: 'options_address' declared here
struct sockaddr_in options_address(struct options* options, const char* port);
                   ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:634:20: error: incomplete result type 'struct sockaddr_in' in function definition
struct sockaddr_in options_address_from_relative_file(struct options* options, const char* directory_in, const char* filename)
                   ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:652:32: error: variable has incomplete type 'struct sockaddr_in'
            struct sockaddr_in result = options_address_from_file(options, path_to_check);
                               ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:686:20: error: incomplete result type 'struct sockaddr_in' in function definition
struct sockaddr_in options_address(struct options* options, const char* port)
                   ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:695:28: error: variable has incomplete type 'struct sockaddr_in'
        struct sockaddr_in result = options_address_from_relative_file(options, absolute_directory, filename);
                           ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:702:23: error: use of undeclared identifier 'AF_INET'
        .sin_family = AF_INET,
                      ^
rep.c:703:34: error: use of undeclared identifier 'INADDR_LOOPBACK'
        .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
                                 ^
rep.c:703:34: error: use of undeclared identifier 'INADDR_LOOPBACK'
rep.c:703:34: error: use of undeclared identifier 'INADDR_LOOPBACK'
rep.c:703:34: error: use of undeclared identifier 'INADDR_LOOPBACK'
rep.c:703:34: error: use of undeclared identifier 'INADDR_LOOPBACK'
rep.c:703:34: error: use of undeclared identifier 'INADDR_LOOPBACK'
rep.c:700:24: error: variable has incomplete type 'struct sockaddr_in'
    struct sockaddr_in address =
                       ^
rep.c:610:8: note: forward declaration of 'struct sockaddr_in'
struct sockaddr_in options_address(struct options* options, const char* port);
       ^
rep.c:719:35: error: implicit declaration of function 'gethostbyname' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
            struct hostent *ent = gethostbyname(host_part);
                                  ^
rep.c:719:35: note: did you mean 'gethostname'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/unistd.h:626:6: note: 'gethostname' declared here
int      gethostname(char *, size_t);
         ^
rep.c:719:29: warning: incompatible integer to pointer conversion initializing 'struct hostent *' with an expression of type 'int' [-Wint-conversion]
            struct hostent *ent = gethostbyname(host_part);
                            ^     ~~~~~~~~~~~~~~~~~~~~~~~~
rep.c:722:28: error: incomplete definition of type 'struct hostent'
            if (NULL == ent->h_addr)
                        ~~~^
rep.c:719:20: note: forward declaration of 'struct hostent'
            struct hostent *ent = gethostbyname(host_part);
                   ^
rep.c:727:53: error: incomplete definition of type 'struct hostent'
            address.sin_addr.s_addr = *(u_long *)ent->h_addr_list[0];
                                                 ~~~^
rep.c:719:20: note: forward declaration of 'struct hostent'
            struct hostent *ent = gethostbyname(host_part);
                   ^
rep.c:947:17: error: implicit declaration of function 'socket' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    nrepl->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
                ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
1 warning and 20 errors generated.
make: *** [rep] Error 1

~/rep ! > nix-build .                                                                                                                            emiller at emiller-mac (main)
error: opening file '/Users/emiller/rep/default.nix': No such file or directory

ᐅ rep -h
rep: Single-shot nREPL client
Synopsis:
  rep [OPTIONS] [--] [CODE ...]
Options:
  -h, --help                      Show this help screen.
  -l, --line=[FILE:]LINE[:COLUMN] Set reference file, line, and column for errors.
  -n, --namespace=NS              Evaluate code in NS (default: user).
  --no-print=KEY                  Suppress output for KEY.
  --op=OP                         nREPL operation (default: eval).
  -p, --port=ADDRESS              TCP port, host:port, @portfile, or @FNAME@RELATIVE.
  --print=KEY|KEY,FD,FORMAT       Print FORMAT to FD when KEY is present.
  --send=KEY,TYPE,VALUE           Send additional KEY of VALUE in request.
  -v, --verbose                   Show all messages sent and received.

# ./rep -h
rep: Single-shot nREPL client
Syntax:
  rep [OPTIONS] CODE ...

Options:
  -h, --help                                   Show this help screen.
  -l, --line LINE[:COLUMN]       1             Specify code's starting LINE and COLUMN.
  -n, --namespace NS             user          Evaluate expressions in NS.
      --op OP                    eval          Send OP as the nREPL operation.
  -p, --port [HOST:]PORT|@FILE   @.nrepl-port  Connect to HOST at PORT, which may be read from FILE.
      --print KEY[,FD[,FORMAT]]  ["out,1,%{name}" "err,2,%{err}" "value,1,%{value}%n"]  Print KEY from response messages to FD using FORMAT.
      --send KEY,TYPE,VALUE                    Send KEY: VALUE in request.

.nrepl-port: No such file or directory

2

> rep -p @.nrepl-port@. '(+ 1 1)'
2