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#include "wily.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
typedef struct Abbrev Abbrev;
struct Abbrev {
Path env;
Stat buf;
};
static struct Abbrev *abbrev = 0;
static int nabbrev = 0, maxabbrev = 0;
static Bool foundmatch (char*dest, char*orig);
static Bool contract (char*dest, char*orig);
static void newenv (char *env, Stat*buf);
static Abbrev* findstat (Stat*buf);
void
env_init(char **envp) {
char *env, *ptr;
Stat buf;
/* Add environment variables */
while ( (env = *envp++)) {
if (! (ptr = strchr(env, '=')) )
continue;
*ptr ++ = 0;
if (strlen(ptr)&& !stat(ptr, &buf))
newenv(env, &buf);
*--ptr = '=';
}
}
/* Copy shorter version of 'orig' into 'dest' */
void
pathcontract(char*dest, char *orig) {
if(orig[0]=='/' && contract(dest, orig)) {
; /* we're done */
} else {
strcpy(dest,orig);
}
}
/******************************************************
static functions
******************************************************/
static Bool
foundmatch(char*dest, char*orig){
Stat buf;
Abbrev *ab;
if(!stat(orig,&buf) && (ab = findstat(&buf))){
sprintf(dest, "$%s", ab->env);
return true;
} else {
return false;
}
}
static Bool
contract(char*dest, char*orig) {
char*lastslash;
Bool retval;
if(foundmatch(dest, orig)) {
return true;
} else {
lastslash = strrchr(orig,'/');
if(lastslash) {
*lastslash = '\0';
retval = contract(dest,orig);
*lastslash = '/';
if(retval) {
strcat(dest, lastslash);
}
return retval;
} else {
return false;
}
}
}
static void
newenv(char *env, Stat*buf) {
Abbrev*new;
Abbrev*old;
/* "I told him we've already got one" Holy Grail */
if((old = findstat(buf))){
if(strlen(env)<strlen(old->env))
strcpy(old->env, env);
return;
}
if (nabbrev == maxabbrev) {
maxabbrev = maxabbrev? maxabbrev*2 : maxabbrev + 2;
abbrev = srealloc(abbrev, maxabbrev * sizeof(*abbrev));
}
new = &abbrev[nabbrev++];
strcpy(new->env, env);
new->buf = *buf;
}
static Abbrev*
findstat(Stat*buf){
Abbrev*ab;
for(ab = abbrev; ab < abbrev + nabbrev; ab++)
if( !statcmp( buf, &ab->buf))
return ab;
return 0;
}
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