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/fold.h

@@ -0,0 +1,65 @@
+#ifndef NEOVIM_FOLD_H
+#define NEOVIM_FOLD_H
+
+/*
+ * Info used to pass info about a fold from the fold-detection code to the
+ * code that displays the foldcolumn.
+ */
+typedef struct foldinfo {
+  int fi_level;                 /* level of the fold; when this is zero the
+                                   other fields are invalid */
+  int fi_lnum;                  /* line number where fold starts */
+  int fi_low_level;             /* lowest fold level that starts in the same
+                                   line */
+} foldinfo_T;
+
+void copyFoldingState(win_T *wp_from, win_T *wp_to);
+int hasAnyFolding(win_T *win);
+int hasFolding(linenr_T lnum, linenr_T *firstp, linenr_T *lastp);
+int hasFoldingWin(win_T *win, linenr_T lnum, linenr_T *firstp,
+                  linenr_T *lastp, int cache,
+                  foldinfo_T *infop);
+int foldLevel(linenr_T lnum);
+int lineFolded(win_T *win, linenr_T lnum);
+long foldedCount(win_T *win, linenr_T lnum, foldinfo_T *infop);
+int foldmethodIsManual(win_T *wp);
+int foldmethodIsIndent(win_T *wp);
+int foldmethodIsExpr(win_T *wp);
+int foldmethodIsMarker(win_T *wp);
+int foldmethodIsSyntax(win_T *wp);
+int foldmethodIsDiff(win_T *wp);
+void closeFold(linenr_T lnum, long count);
+void closeFoldRecurse(linenr_T lnum);
+void opFoldRange(linenr_T first, linenr_T last, int opening,
+                 int recurse,
+                 int had_visual);
+void openFold(linenr_T lnum, long count);
+void openFoldRecurse(linenr_T lnum);
+void foldOpenCursor(void);
+void newFoldLevel(void);
+void foldCheckClose(void);
+int foldManualAllowed(int create);
+void foldCreate(linenr_T start, linenr_T end);
+void deleteFold(linenr_T start, linenr_T end, int recursive,
+                int had_visual);
+void clearFolding(win_T *win);
+void foldUpdate(win_T *wp, linenr_T top, linenr_T bot);
+void foldUpdateAll(win_T *win);
+int foldMoveTo(int updown, int dir, long count);
+void foldInitWin(win_T *new_win);
+int find_wl_entry(win_T *win, linenr_T lnum);
+void foldAdjustVisual(void);
+void foldAdjustCursor(void);
+void cloneFoldGrowArray(garray_T *from, garray_T *to);
+void deleteFoldRecurse(garray_T *gap);
+void foldMarkAdjust(win_T *wp, linenr_T line1, linenr_T line2,
+                    long amount,
+                    long amount_after);
+int getDeepestNesting(void);
+char_u *get_foldtext(win_T *wp, linenr_T lnum, linenr_T lnume,
+                     foldinfo_T *foldinfo,
+                     char_u *buf);
+void foldtext_cleanup(char_u *str);
+int put_folds(FILE *fd, win_T *wp);
+
+#endif /* NEOVIM_FOLD_H */