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Add readDir primop

This commit is contained in:
Shea Levy 2014-10-01 10:17:50 -04:00 committed by Eelco Dolstra
parent 3fd2d2187e
commit c08c802bf3
1 changed files with 37 additions and 0 deletions
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37
src/libexpr/primops.cc
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@ -800,6 +800,42 @@ static void prim_findFile(EvalState & state, const Pos & pos, Value * * args, Va
mkPath(v, state.findFile(searchPath, path).c_str());
}
/* Read a directory (without . or ..) */
static void prim_readDir(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
PathSet ctx;
Path path = state.coerceToPath(pos, *args[0], ctx);
try {
realiseContext(ctx);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot read ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
}
DirEntries entries = readDirectory(path);
state.mkAttrs(v, entries.size());
for (const auto & ent : entries) {
Value * ent_val = state.allocAttr(v, state.symbols.create(ent.name));
if (ent.type == DT_UNKNOWN) {
struct stat st = lstat(path + "/" + ent.name);
mkString(*ent_val,
S_ISREG(st.st_mode) ? "regular" :
S_ISDIR(st.st_mode) ? "directory" :
S_ISLNK(st.st_mode) ? "symlink" :
"unknown");
} else {
mkString(*ent_val,
ent.type == DT_REG ? "regular" :
ent.type == DT_DIR ? "directory" :
ent.type == DT_LNK ? "symlink" :
"unknown");
}
}
v.attrs->sort();
}
/*************************************************************
* Creating files
@ -1460,6 +1496,7 @@ void EvalState::createBaseEnv()
addPrimOp("baseNameOf", 1, prim_baseNameOf);
addPrimOp("dirOf", 1, prim_dirOf);
addPrimOp("__readFile", 1, prim_readFile);
addPrimOp("__readDir", 1, prim_readDir);
addPrimOp("__findFile", 2, prim_findFile);
// Creating files