X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=pd_readline.c;h=044d6efb04e274667dba0eda24c6f1d6f61efe34;hb=d56fdb0ce92c92e27ef45a8315ff26c272a1f23d;hp=5bf04dc7d8715e2388ebb8fb247653535c522a95;hpb=4bb27266f935c9aafad6870ffc8847fc65c8120f;p=pd_readline diff --git a/pd_readline.c b/pd_readline.c index 5bf04dc..044d6ef 100644 --- a/pd_readline.c +++ b/pd_readline.c @@ -7,249 +7,46 @@ /* up-arrow key. */ /* This code is released to the public domain. */ /* "Share and enjoy...." ;) */ +/* See the UNLICENSE file for details. */ - - -#include -#include -#include - -/* This implementation of getch() is from here - */ -/* http://wesley.vidiqatch.org/ */ -/* Thanks, Wesley! */ -static struct termios old, new; - -/* Initialize new terminal i/o settings */ -void initTermios(int echo) { - tcgetattr(0, &old); /* grab old terminal i/o settings */ - new = old; /* make new settings same as old settings */ - new.c_lflag &= ~ICANON; /* disable buffered i/o */ - new.c_lflag &= echo ? ECHO : ~ECHO; /* set echo mode */ - tcsetattr(0, TCSANOW, &new); /* use these new terminal i/o settings now */ -} - - -/* Restore old terminal i/o settings */ -void resetTermios(void) { - tcsetattr(0, TCSANOW, &old); -} - - -/* Read 1 character - echo defines echo mode */ -char getch_(int echo) { - char ch; - initTermios(echo); - ch = getchar(); - resetTermios(); - return ch; -} - - -/* Read 1 character without echo */ -char getch(void) { - return getch_(0); -} - - -/* Read 1 character with echo */ -char getche(void) { - return getch_(1); -} - - - -/* Helper function, to let us see if a file */ -/* exists in the current directory. */ -int fexists(char *fname) -{ - FILE *fptr; - fptr = fopen(fname, "r") ; - if ( !fptr ) return -1 ; /* File does not exist in dir. */ - fclose(fptr); - return 0; /* File DOES exist in dir. */ -} - - -/* Helper function to chop newlines off the lines read in. */ -/* Without this being done, an extra newline is inserted */ -/* (which is usually not what is wanted). */ -char *chop(char *s) -{ - s[strcspn(s,"\n")] = '\0'; - return s; -} - - -/* An array to store the command-history file in. */ -/* Only 20 lines are read. */ -char hist[20][80]; - - -/* Read the file into the array of strings. */ -void readfile(char *fname) -{ - int retval = fexists(fname); - - int i; - if (retval == 0) { - /* File exists, so open it. */ - /* We open it in read-write mode so we can */ - /* append new commands to it. */ - FILE *fptr; - fptr = fopen(fname, "rw"); - - for(i=0; i<20; i++) - { - chop(fgets(hist[i], 80, fptr) ); - } - - } /* retval == 0 */ - - else puts("Error! File does not exist. \n"); - -} - - -/* Helper function to print the command-history file. */ -void printfile(void) -{ - int j; - - for(j=0; j<20; j++) - { - puts(hist[j]); - } -} - - - - -/* Helper function. Print a previous command-line WITHOUT */ -/* a newline. */ -void putline(char *str) -{ - char *line = chop(str); - printf("%s", line); -} +/* TO DO - */ +/* a) Add support for Home and End (of line) keys. */ +/* b) Add support for function keys. */ +/* c) Add support for Insert key so that text can be */ +/* inserted. */ +/* d) Put much of the code into a header file. */ +/* e) Change so that pressing Enter adds the current */ +/* line of commands to the command-history. */ +/* ( May look at using Ctrl-D to exit, as Python */ +/* does with its command-line. ) */ +/* f) Add support for copying and pasting text via */ +/* Ctrl-C and Ctrl-V. */ +#include "pd_readline.h" int main(void) { - -/* Our "command-history" file. */ -readfile("test.txt"); - -/* Main buffer for the command-line. */ -char buffer[80]; + + /* Create a buffer for entered text. */ + buf mybuf; + mybuf.index = 0; + + + /* Read in the command history file. */ + hist myhist = readhistory("test.txt"); -/* Main buffer "pointer" */ -int bufpnt = 0; - -/* "Pointer" for the history file. */ -int histpnt = 20; - while(1) - { - - int key = getch(); - buffer[bufpnt] = key; - bufpnt += 1; + { - /* Printable chars. */ - if ( (key >= 32) && (key <= 126) ) - { - /* We have a printable key so print it. */ - putchar(key); - bufpnt += 1; - } - - /* Up arrow is 27, 91, 65. ( ESC [ A ) */ - /* Down arrow is 27, 91, 66. ( ESC [ B ) */ - /* Right arrow is 27, 91, 67. ( ESC [ C ) */ - /* Left arrow is 27, 91, 68. ( ESC [ D ) */ - /* Function keys. */ - /* F2 is 27, 79, 81. */ - /* F3 is 27, 79, 82. */ - /* F4 is 27, 79, 83. */ - - /* Backspace */ - else if(key == 127) - { - /* Move left 1 char and delete that char */ - bufpnt -= 1; - printf("\033[1D"); - printf("\040"); - printf("\033[1D"); - /* Move 1 char to left again */ - bufpnt -= 1; - } - - /* We have an escape key-sequence */ - else if(key == 27) - { - key = getch(); - if(key == 91) - key = getch(); - - if (key == 65) /* Up Arrow */ - { - /* Move one command "back" in history. */ - histpnt -= 1; - /* Clear to end of line. */ - printf("\033[80D"); - printf("\033[K"); - /* Move buffer pointer to start of line */ - bufpnt = 0; - /* Clear the array. */ - memset(buffer, 0, sizeof(char)*80); - /* Print the pointed-at command-sequence. */ - putline(hist[histpnt]); - } - - if(key == 66) /* Down Arrow */ - { - /* Move one command "forward" in history. */ - histpnt += 1; - /* Clear to end of line. */ - printf("\033[80D"); - printf("\033[K"); - /* Move buffer pointer to start of line */ - bufpnt = 0; - /* Clear the array. */ - memset(buffer, 0, sizeof(char)*80); - /* Print the pointed-at command-sequence. */ - putline(hist[histpnt]); - } - - if(key == 67) /* Left arrow */ - { - /* Move one character to the left. */ - printf("\033[1C"); - } - - if(key == 68) /* Right arrow */ - { - /* Move one character to the right. */ - printf("\033[1D"); - } - - } /* End of key=27 key sequence. */ - - - /* The Enter key exits. Enter is 10 decimal */ - else if(key == 10) - { - puts("\n"); - puts("Exiting... \n"); - break; - } /* Key = Enter */ - } + keyhandler(mybuf, myhist); + + } - return 0; - + return 0; + }