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repo: fmrl-client
action: blob
revision:
path_from: clump.c
revision_from: refs/heads/trunk:
path_to:
revision_to:

refs/heads/trunk:/clump.c
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 //clumps together consecutive rows containing the same first column
 //to have column 2- printed after a single column 1 value.
 //just try it out.
 //printf "a a\na b\na c\nb a\nb b\nc a\nc b\n" | clump
 //still working on the name.

 int main(int argc,char *argv[]) {
  char line[256];
  char *id;
  char sep=' ';
  char *value;
  char *oldid=malloc(1);
  *oldid=0;
  if(argc > 1) sep=argv[1][0];
  while(fgets(line,sizeof(line),stdin)) {
   id=line;
   if(strchr(line,'\n')) *strchr(line,'\n')=0;
   if(strchr(id,sep)) {
    value=strchr(id,sep);
    *value=0;
    value++;
   }
   if(strcmp(id,oldid)) {
    if(*oldid != 0) {
     printf("\n");
    }
    printf("%s:",id);
    free(oldid);
    oldid=strdup(id);
   }
   printf(" %s",value);
  }
  printf("\n");
  return 0;
 }

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