Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

src/nvim/os/fs.c

@@ -0,0 +1,277 @@
+// fs.c -- filesystem access
+
+#include "os/os.h"
+#include "memory.h"
+#include "message.h"
+#include "misc1.h"
+#include "misc2.h"
+#include "path.h"
+
+static bool is_executable(const char_u *name);
+static bool is_executable_in_path(const char_u *name);
+
+// Many fs functions from libuv return that value on success.
+static const int kLibuvSuccess = 0;
+
+int os_chdir(const char *path) {
+  if (p_verbose >= 5) {
+    verbose_enter();
+    smsg((char_u *)"chdir(%s)", path);
+    verbose_leave();
+  }
+  return uv_chdir(path);
+}
+
+int os_dirname(char_u *buf, size_t len)
+{
+  assert(buf && len);
+
+  int errno;
+  if ((errno = uv_cwd((char *)buf, &len)) != kLibuvSuccess) {
+    vim_strncpy(buf, (char_u *)uv_strerror(errno), len - 1);
+    return FAIL;
+  }
+  return OK;
+}
+
+bool os_isdir(const char_u *name)
+{
+  int32_t mode = os_getperm(name);
+  if (mode < 0) {
+    return false;
+  }
+
+  if (!S_ISDIR(mode)) {
+    return false;
+  }
+
+  return true;
+}
+
+bool os_can_exe(const char_u *name)
+{
+  // If it's an absolute or relative path don't need to use $PATH.
+  if (path_is_absolute_path(name) ||
+     (name[0] == '.' && (name[1] == '/' ||
+                        (name[1] == '.' && name[2] == '/')))) {
+    return is_executable(name);
+  }
+
+  return is_executable_in_path(name);
+}
+
+// Return true if "name" is an executable file, false if not or it doesn't
+// exist.
+static bool is_executable(const char_u *name)
+{
+  int32_t mode = os_getperm(name);
+
+  if (mode < 0) {
+    return false;
+  }
+
+  if (S_ISREG(mode) && (S_IEXEC & mode)) {
+    return true;
+  }
+
+  return false;
+}
+
+/// Check if a file is inside the $PATH and is executable.
+///
+/// @return `true` if `name` is an executable inside $PATH.
+static bool is_executable_in_path(const char_u *name)
+{
+  const char *path = getenv("PATH");
+  // PATH environment variable does not exist or is empty.
+  if (path == NULL || *path == NUL) {
+    return false;
+  }
+
+  int buf_len = STRLEN(name) + STRLEN(path) + 2;
+  char_u *buf = alloc((unsigned)(buf_len));
+
+  // Walk through all entries in $PATH to check if "name" exists there and
+  // is an executable file.
+  for (;; ) {
+    const char *e = strchr(path, ':');
+    if (e == NULL) {
+      e = path + STRLEN(path);
+    }
+
+    // Glue together the given directory from $PATH with name and save into
+    // buf.
+    vim_strncpy(buf, (char_u *) path, e - path);
+    append_path((char *) buf, (const char *) name, buf_len);
+
+    if (is_executable(buf)) {
+      // Found our executable. Free buf and return.
+      free(buf);
+      return true;
+    }
+
+    if (*e != ':') {
+      // End of $PATH without finding any executable called name.
+      free(buf);
+      return false;
+    }
+
+    path = e + 1;
+  }
+
+  // We should never get to this point.
+  assert(false);
+  return false;
+}
+
+int os_stat(const char_u *name, uv_stat_t *statbuf)
+{
+  uv_fs_t request;
+  int result = uv_fs_stat(uv_default_loop(), &request,
+                          (const char *)name, NULL);
+  *statbuf = request.statbuf;
+  uv_fs_req_cleanup(&request);
+
+  if (result == kLibuvSuccess) {
+    return OK;
+  }
+
+  return FAIL;
+}
+
+int32_t os_getperm(const char_u *name)
+{
+  uv_stat_t statbuf;
+  if (os_stat(name, &statbuf) == FAIL) {
+    return -1;
+  } else {
+    return (int32_t)statbuf.st_mode;
+  }
+}
+
+int os_setperm(const char_u *name, int perm)
+{
+  uv_fs_t request;
+  int result = uv_fs_chmod(uv_default_loop(), &request,
+                           (const char*)name, perm, NULL);
+  uv_fs_req_cleanup(&request);
+
+  if (result == kLibuvSuccess) {
+    return OK;
+  }
+
+  return FAIL;
+}
+
+bool os_file_exists(const char_u *name)
+{
+  uv_stat_t statbuf;
+  if (os_stat(name, &statbuf) == OK) {
+    return true;
+  }
+
+  return false;
+}
+
+bool os_file_is_readonly(const char *name)
+{
+  return access(name, W_OK) != 0;
+}
+
+int os_file_is_writable(const char *name)
+{
+  if (access(name, W_OK) == 0) {
+    if (os_isdir((char_u *)name)) {
+      return 2;
+    }
+    return 1;
+  }
+  return 0;
+}
+
+bool os_get_file_size(const char *name, off_t *size)
+{
+  uv_stat_t statbuf;
+  if (os_stat((char_u *)name, &statbuf) == OK) {
+    *size = statbuf.st_size;
+    return true;
+  }
+  return false;
+}
+
+int os_rename(const char_u *path, const char_u *new_path)
+{
+  uv_fs_t request;
+  int result = uv_fs_rename(uv_default_loop(), &request,
+                            (const char *)path, (const char *)new_path, NULL);
+  uv_fs_req_cleanup(&request);
+
+  if (result == kLibuvSuccess) {
+    return OK;
+  }
+
+  return FAIL;
+}
+
+int os_mkdir(const char *path, int32_t mode)
+{
+  uv_fs_t request;
+  int result = uv_fs_mkdir(uv_default_loop(), &request, path, mode, NULL);
+  uv_fs_req_cleanup(&request);
+  return result;
+}
+
+int os_rmdir(const char *path)
+{
+  uv_fs_t request;
+  int result = uv_fs_rmdir(uv_default_loop(), &request, path, NULL);
+  uv_fs_req_cleanup(&request);
+  return result;
+}
+
+int os_remove(const char *path)
+{
+  uv_fs_t request;
+  int result = uv_fs_unlink(uv_default_loop(), &request, path, NULL);
+  uv_fs_req_cleanup(&request);
+  return result;
+}
+
+bool os_get_file_info(const char *path, FileInfo *file_info)
+{
+  if (os_stat((char_u *)path, &(file_info->stat)) == OK) {
+    return true;
+  }
+  return false;
+}
+
+bool os_get_file_info_link(const char *path, FileInfo *file_info)
+{
+  uv_fs_t request;
+  int result = uv_fs_lstat(uv_default_loop(), &request, path, NULL);
+  file_info->stat = request.statbuf;
+  uv_fs_req_cleanup(&request);
+  if (result == kLibuvSuccess) {
+    return true;
+  }
+  return false;
+}
+
+bool os_get_file_info_fd(int file_descriptor, FileInfo *file_info)
+{
+  uv_fs_t request;
+  int result = uv_fs_fstat(uv_default_loop(), &request, file_descriptor, NULL);
+  file_info->stat = request.statbuf;
+  uv_fs_req_cleanup(&request);
+  if (result == kLibuvSuccess) {
+    return true;
+  }
+  return false;
+}
+
+bool os_file_info_id_equal(FileInfo *file_info_1, FileInfo *file_info_2)
+{
+  return file_info_1->stat.st_ino == file_info_2->stat.st_ino
+         && file_info_1->stat.st_dev == file_info_2->stat.st_dev;
+}
+