Refactor frontend code

window.[ch] now contains a somewhat generic editor window which is
then enhanced in vis.[ch] with a statusbar.

1 files changed, 170 insertions, 0 deletions

diff --git a/vis.h b/vis.h
new file mode 100644
index 0000000..2acee21
--- /dev/null
+++ b/vis.h
@@ -0,0 +1,170 @@
+#ifndef VIS_H
+#define VIS_H
+
+#include <stddef.h>
+#include <regex.h>
+#include "text-motions.h"
+#include "text-objects.h"
+#include "window.h"
+#include "register.h"
+
+typedef struct Vis Vis;
+typedef struct VisWin VisWin;
+
+struct VisWin {
+	Vis *vis;            /* editor instance to which this window belongs */
+	Text *text;          /* underlying text management */
+	Win *win;            /* vis window for the text area  */
+	WINDOW *statuswin;   /* curses window for the statusbar */
+	int width, height;   /* window size including the statusbar */
+	VisWin *prev, *next; /* neighbouring windows */
+};
+
+typedef void (*vis_statusbar_t)(WINDOW *win, bool active, const char *filename, size_t line, size_t col);
+
+struct Vis {
+	int width, height;             /* terminal size, available for all windows */
+	VisWin *windows;               /* list of windows */
+	VisWin *win;                   /* currently active window */
+	Syntax *syntaxes;              /* NULL terminated array of syntax definitions */
+	void (*windows_arrange)(Vis*); /* current layout which places the windows */
+	vis_statusbar_t statusbar;     /* configurable user hook to draw statusbar */
+};
+
+typedef union {
+	size_t i;
+	const char *s;
+	size_t (*m)(Win*);
+	void (*f)(Vis*);
+} Arg;
+
+typedef struct {
+	char str[6];
+	int code;
+} Key;
+
+typedef struct {
+	Key key[2];
+	void (*func)(const Arg *arg);
+	const Arg arg;
+} KeyBinding;
+
+typedef struct Mode Mode;
+struct Mode {
+	Mode *parent;
+	KeyBinding *bindings;
+	const char *name;
+	void (*enter)(void);
+	void (*leave)(void);
+	bool (*unknown)(Key *key0, Key *key1);        /* unknown key for this mode, return value determines whether parent modes will be checked */ 
+	bool (*input)(const char *str, size_t len);   /* unknown key for this an all parent modes */
+};
+
+typedef struct {
+	char *name;
+	Mode *mode;
+	vis_statusbar_t statusbar;
+} Config;
+
+typedef struct {
+	int count;
+	Register *reg;
+	Filerange range;
+	size_t pos;
+} OperatorContext;
+
+typedef void (Operator)(OperatorContext*);
+
+typedef struct {
+	size_t (*win)(Win*);
+	size_t (*txt)(Text*, size_t pos);
+	enum {
+		LINEWISE  = 1 << 0,
+		CHARWISE  = 1 << 1,
+		INCLUSIVE = 1 << 2,
+		EXCLUSIVE = 1 << 3,
+	} type;
+	int count;
+} Movement;
+
+typedef struct {
+	Filerange (*range)(Text*, size_t pos);
+	enum {
+		INNER,
+		OUTER,
+	} type;
+} TextObject;
+
+typedef struct {
+	int count;
+	Operator *op;
+	Movement *movement;
+	TextObject *textobj;
+	Register *reg;
+} Action;
+
+typedef struct {
+	short fg, bg;   /* fore and background color */
+	int attr;       /* curses attributes */
+} Color;
+
+typedef struct {
+	char *rule;     /* regex to search for */
+	int cflags;     /* compilation flags (REG_*) used when compiling */
+	Color color;    /* settings to apply in case of a match */
+	regex_t regex;  /* compiled form of the above rule */
+} SyntaxRule;
+
+#define SYNTAX_REGEX_RULES 10
+
+typedef struct Syntax Syntax;
+
+struct Syntax {                              /* a syntax definition */
+	char *name;                           /* syntax name */
+	char *file;                           /* apply to files matching this regex */
+	regex_t file_regex;                   /* compiled file name regex */
+	SyntaxRule rules[SYNTAX_REGEX_RULES]; /* all rules for this file type */
+};
+
+Vis *vis_new(int width, int height);
+void vis_free(Vis*); 
+void vis_resize(Vis*, int width, int height); 
+void vis_snapshot(Vis*);
+void vis_undo(Vis*);
+void vis_redo(Vis*);
+void vis_draw(Vis*);
+void vis_update(Vis*);
+void vis_insert_key(Vis*, const char *c, size_t len);
+void vis_replace_key(Vis*, const char *c, size_t len);
+void vis_backspace_key(Vis*);
+void vis_delete_key(Vis*);
+void vis_insert(Vis*, size_t pos, const char *data, size_t len);
+void vis_delete(Vis*, size_t pos, size_t len);
+
+// mark handling
+typedef int Mark;
+void vis_mark_set(Vis*, Mark, size_t pos);
+void vis_mark_goto(Vis*, Mark);
+void vis_mark_clear(Vis*, Mark);
+
+// TODO comment
+bool vis_syntax_load(Vis*, Syntax *syntaxes, Color *colors);
+void vis_syntax_unload(Vis*);
+
+void vis_search(Vis *ed, const char *regex, int direction);
+size_t vis_line_goto(Vis *vis, size_t lineno);
+
+bool vis_window_new(Vis *vis, const char *filename);
+void vis_window_split(Vis *ed, const char *filename);
+void vis_window_vsplit(Vis *ed, const char *filename);
+void vis_window_next(Vis *ed);
+void vis_window_prev(Vis *ed);
+
+void vis_statusbar_set(Vis*, vis_statusbar_t);
+
+/* library initialization code, should be run at startup */
+void vis_init(void);
+short vis_color_reserve(short fg, short bg);
+short vis_color_get(short fg, short bg);
+
+#endif