eeshow/: use printf-style formatting for overlay text; test mode -F fmt string

eeshow/Makefile

@@ -12,7 +12,7 @@
 
 NAME = eeshow
 OBJS = main.o sch-parse.o sch-render.o lib-parse.o lib-render.o \
-       gui.o gui-over.o gui-aoi.o \
+       gui.o gui-over.o gui-aoi.o fmt-pango.o \
        file.o git-util.o git-file.o git-hist.o \
        style.o fig.o record.o cro.o diff.o gfx.o dwg.o text.o misc.o
 

eeshow/fmt-pango.c

@@ -0,0 +1,145 @@
+/*
+ * fmt-pango.c - Format strings for Pango markup
+ *
+ * Written 2016 by Werner Almesberger
+ * Copyright 2016 by Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#define	_GNU_SOURCE	/* for asprintf */
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <alloca.h>
+
+#include "util.h"
+#include "fmt-pango.h"
+
+
+unsigned vsfmt_pango(char *buf, const char *fmt, va_list ap)
+{
+	char *res;
+	const char *p, *q, *s, *t;
+	char *u;
+	char *tmp_fmt;
+	char *tmp, *tmp2;
+	int len;
+	unsigned extra;
+
+	res = buf;
+	for (p = fmt; *p; p++) {
+		if (*p != '%') {
+			if (buf)
+				*res = *p;
+			res++;
+			continue;
+		}
+		for (q = p + 1; isdigit(*q) || *q == '.' || *q == '-'; q++);
+		tmp_fmt = alloca(q - p + 1 + 1);
+		memcpy(tmp_fmt, p, q - p + 1);
+		tmp_fmt[q - p + 1] = 0;
+		switch (*q) {
+		case 's':
+			s = va_arg(ap, const char *);
+			len = asprintf(&tmp, tmp_fmt, s);
+
+			extra = 0;
+			for (t = tmp; *t; t++)
+				switch (*t) {
+				case '<':
+				case '>':
+					extra += 3;
+					break;
+				case '&':
+					extra += 4;
+					break;
+				default:
+					break;
+				}
+			
+			if (extra) {
+				tmp2 = u = alloca(len + extra + 1);
+				for (t = tmp; *t; t++) {
+					switch (*t) {
+					case '<':
+						strcpy(u, "&lt;");
+						u += 4;
+						break;
+					case '>':
+						strcpy(u, "&gt;");
+						u += 4;
+						break;
+					case '&':
+						strcpy(u, "&amp;");
+						u += 5;
+						break;
+					default:
+						*u++ = *t;
+						break;
+					}
+				}
+				*u = 0;
+				tmp = tmp2;
+			}
+
+			if (buf)
+				memcpy(res, tmp, len + extra);
+			res += len + extra;
+			break;
+		case 'c':
+			/* @@@ we don't filter markup meta-characters */
+		case 'd':
+		case 'x':
+			len = asprintf(&tmp, tmp_fmt, va_arg(ap, int));
+			if (buf)
+				memcpy(res, tmp, len);
+			res += len;
+			break;
+		case '%':
+			if (buf)
+				*res = '%';
+			res++;
+			break;
+		default:
+			fprintf(stderr, "unrecognized format '%%%c'\n", *q);
+			exit(1);
+		}
+		p = q;
+	}
+	if (buf)
+		*res = 0;
+	return res - buf;
+}
+
+
+char *vfmt_pango(const char *fmt, va_list ap)
+{
+	va_list aq;
+	unsigned len;
+	char *buf;
+
+	va_copy(aq, ap);
+	len = vsfmt_pango(NULL, fmt, ap);
+	buf = alloc_size(len + 1);
+	vsfmt_pango(buf, fmt, aq);
+	va_end(aq);
+	return buf;
+}
+
+
+char *fmt_pango(const char *fmt, ...)
+{
+	va_list ap;
+	char *buf;
+
+	va_start(ap, fmt);
+	buf = vfmt_pango(fmt, ap);
+	va_end(ap);
+	return buf;
+}

eeshow/fmt-pango.h

@@ -0,0 +1,24 @@
+/*
+ * fmt-pango.h - Format strings for Pango markup
+ *
+ * Written 2016 by Werner Almesberger
+ * Copyright 2016 by Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#ifndef FMT_PANGO_H
+#define FMT_PANGO_H
+
+#include <stdarg.h>
+
+
+unsigned vsfmt_pango(char *buf, const char *fmt, va_list ap);
+char *vfmt_pango(const char *fmt, va_list ap);
+char *fmt_pango(const char *fmt, ...);
+
+#endif /* !FMT_PANGO_H */

eeshow/gui-over.c

@@ -19,13 +19,16 @@
  */
 
 #include <stddef.h>
+#include <stdarg.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <math.h>
 
 #include <cairo/cairo.h>
 #include <pango/pangocairo.h>
 
 #include "util.h"
+#include "fmt-pango.h"
 #include "gui-aoi.h"
 #include "gui-over.h"
 
@@ -74,8 +77,8 @@ struct overlay *overlay_draw(struct overlay *over, cairo_t *cr, int *x, int *y)
 	PangoRectangle ink_rect;
 
 	layout = pango_cairo_create_layout(cr);
-	pango_layout_set_text(layout, over->s, -1);
-	desc = pango_font_description_from_string("Helvetica Bold 12");
+	pango_layout_set_markup(layout, over->s, -1);
+	desc = pango_font_description_from_string("Helvetica 10");
 	pango_layout_set_font_description(layout, desc);
 	pango_font_description_free(desc);
 
@@ -131,15 +134,14 @@ void overlay_draw_all(struct overlay *overlays, cairo_t *cr)
 }
 
 
-struct overlay *overlay_add(struct overlay **overlays, const char *s,
-    struct aoi **aois,
+struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
     bool (*hover)(void *user, bool on), void (*click)(void *user), void *user)
 {
 	struct overlay *over;
 	struct overlay **anchor;
 
 	over = alloc_type(struct overlay);
-	over->s = stralloc(s);
+	over->s = NULL;
 
 	over->aois = aois;
 	over->hover = hover;
@@ -155,6 +157,17 @@ struct overlay *overlay_add(struct overlay **overlays, const char *s,
 }
 
 
+void overlay_text(struct overlay *over, const char *fmt, ...)
+{
+	va_list ap;
+
+	free((char *) over->s);
+	va_start(ap, fmt);
+	over->s = vfmt_pango(fmt, ap);
+	va_end(ap);
+}
+
+
 static void overlay_free(struct overlay *over)
 {
 	if (over->aoi)

eeshow/gui-over.h

@@ -25,9 +25,9 @@ struct overlay;
 
 struct overlay *overlay_draw(struct overlay *over, cairo_t *cr, int *x, int *y);
 void overlay_draw_all(struct overlay *overlays, cairo_t *cr);
-struct overlay *overlay_add(struct overlay **overlays, const char *s,
-    struct aoi **aois,
+struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
     bool (*hover)(void *user, bool on), void (*click)(void *user), void *user);
+void overlay_text(struct overlay *over, const char *fmt, ...);
 void overlay_remove(struct overlay **overlays, struct overlay *over);
 void overlay_remove_all(struct overlay **overlays);
 

eeshow/gui.c

@@ -303,14 +303,15 @@ static void click_history(void *user)
 static void show_history(struct gui_ctx *ctx)
 {
 	struct gui_hist *h = ctx->hist;
-	char *s;
+	struct overlay *over;
 
 	overlay_remove_all(&ctx->vcs_overlays);
 	for (h = ctx->hist; h; h = h->next) {
 		// @@@ \n doesn't work with cairo_show_text :-(
-		if (asprintf(&s, "commit\n%s", vcs_git_summary(h->hist))) {}
-		overlay_add(&ctx->vcs_overlays, s, &ctx->aois,
+		over = overlay_add(&ctx->vcs_overlays, &ctx->aois,
 		    NULL, click_history, h);
+		overlay_text(over, "<small>%.60s</small>",
+		    vcs_git_summary(h->hist));
 	}
 	redraw(ctx);
 }
@@ -341,6 +342,8 @@ static void close_subsheet(void *user)
 
 static void go_to_sheet(struct gui_ctx *ctx, struct gui_sheet *sheet)
 {
+	struct overlay *over;
+
 	if (!sheet->rendered) {
 		render_sheet(sheet);
 		mark_aois(ctx, sheet);
@@ -348,16 +351,16 @@ static void go_to_sheet(struct gui_ctx *ctx, struct gui_sheet *sheet)
 	ctx->curr_sheet = sheet;
 	overlay_remove_all(&ctx->sheet_overlays);
 	if (ctx->hist) {
-		char *s;
-
-		if (asprintf(&s, "%.40s",
-		    vcs_git_summary(ctx->curr_hist->hist))) {}
-		overlay_add(&ctx->sheet_overlays, s, &ctx->aois,
+		over = overlay_add(&ctx->sheet_overlays, &ctx->aois,
 		    NULL, show_history_cb, ctx);
+		overlay_text(over, "%.40s",
+		    vcs_git_summary(ctx->curr_hist->hist));
+	}
+	if (sheet->sch->title) {
+		over = overlay_add(&ctx->sheet_overlays, &ctx->aois,
+		    NULL, close_subsheet, ctx);
+		overlay_text(over, "<b>%s</b>", sheet->sch->title);
 	}
-	if (sheet->sch->title)
-		overlay_add(&ctx->sheet_overlays, sheet->sch->title,
-		    &ctx->aois, NULL, close_subsheet, ctx);
 	zoom_to_extents(ctx);
 }
 

eeshow/main.c

@@ -27,6 +27,7 @@
 #include "file.h"
 #include "lib.h"
 #include "sch.h"
+#include "fmt-pango.h"
 #include "git-hist.h"
 #include "gui.h"
 #include "main.h"
@@ -94,6 +95,7 @@ int main(int argc, char **argv)
 	bool recurse = 0;
 	const char *cat = NULL;
 	const char *history = NULL;
+	const char *fmt = NULL;
 	char c;
 	int arg, dashdash;
 	bool have_dashdash = 0;
@@ -110,7 +112,7 @@ int main(int argc, char **argv)
 	if (!have_dashdash)
 		gtk_init(&argc, &argv);
 
-	while ((c = getopt(dashdash, argv, "rvC:H:")) != EOF)
+	while ((c = getopt(dashdash, argv, "rvC:F:H:")) != EOF)
 		switch (c) {
 		case 'r':
 			recurse = 1;
@@ -121,6 +123,9 @@ int main(int argc, char **argv)
 		case 'C':
 			cat = optarg;
 			break;
+		case 'F':
+			fmt = optarg;
+			break;
 		case 'H':
 			history = optarg;
 			break;
@@ -149,6 +154,14 @@ int main(int argc, char **argv)
 		return 0;
 	}
 
+	if (fmt) {
+		char *buf;
+
+		buf = fmt_pango(fmt, argv[optind]);
+		printf("\"%s\"\n", buf);
+		return 0;
+	}
+
 	if (dashdash - optind < 1)
 		usage(*argv);