eeshow/: make libraries "related" to the [main] schematics sheet

That way, we can use relative paths on the command line, ideally just
./eeshow foo.lib bar.lib com/plex/path/foo.sch

eeshow/Makefile

@@ -78,7 +78,7 @@ neo900.pdf:	$(NAME) sch2pdf neo900-template.fig
 		    $(NEO900_HW)/neo900.sch
 
 pdf:		$(NAME)
-		./eeshow -r $(NEO900_HW)/neo900.lib $(KICAD_LIBS)/powered.lib \
+		./eeshow -r neo900.lib kicad-libs/components/powered.lib \
 		    $(NEO900_HW)/neo900.sch -- pdf -o neo900.pdf
 
 #----- Regression test based on Neo900 schematics -----------------------------

eeshow/diff.c

@@ -20,6 +20,7 @@
 #include "util.h"
 #include "main.h"
 #include "cro.h"
+#include "file.h"
 #include "sch.h"
 #include "lib.h"
 #include "diff.h"
@@ -111,6 +112,7 @@ static void *diff_init(int argc, char *const *argv)
 	char c;
 	int arg;
 	struct sch_ctx new_sch;
+	struct file sch_file;
 	struct lib new_lib;
 
 	diff = alloc_type(struct diff);
@@ -136,9 +138,11 @@ static void *diff_init(int argc, char *const *argv)
 	if (argc - optind < 1)
 		usage(*argv);
 
+	file_open(&sch_file, argv[argc - 1], NULL);
 	for (arg = optind; arg != argc - 1; arg++)
-		lib_parse(&new_lib, argv[arg]);
+		lib_parse(&new_lib, argv[arg], &sch_file);
-	sch_parse(&new_sch, argv[argc - 1], &new_lib);
+	sch_parse(&new_sch, &sch_file, &new_lib);
+	file_close(&sch_file);
 
 	optind = 0;
 	gfx_init(&cro_img_ops, argc, argv);

eeshow/lib-parse.c

@@ -252,12 +252,12 @@ static bool lib_parse_line(const struct file *file,
 }
 
 
-void lib_parse(struct lib *lib, const char *name)
+void lib_parse(struct lib *lib, const char *name, const struct file *related)
 {
 	struct file file;
 
 	lib->state = lib_skip;
-	file_open(&file, name, NULL);
+	file_open(&file, name, related);
 	file_read(&file, lib_parse_line, lib);
 	file_close(&file);
 }

eeshow/lib.h

@@ -16,6 +16,8 @@
 
 #include <stdbool.h>
 
+#include "file.h"
+
 
 enum lib_state {
 	lib_skip,	/* before a definition */
@@ -117,7 +119,7 @@ const struct comp *lib_find(const struct lib *lib, const char *name);
 bool lib_field_visible(const struct comp *comp, int n);
 void lib_render(const struct comp *comp, unsigned unit, const int m[6]);
 
-void lib_parse(struct lib *lib, const char *name);
+void lib_parse(struct lib *lib, const char *name, const struct file *related);
 void lib_init(struct lib *lib);
 
 #endif /* !LIB_H */

eeshow/main.c

@@ -81,6 +81,7 @@ int main(int argc, char *const *argv)
 {
 	struct lib lib;
 	struct sch_ctx sch_ctx;
+	struct file sch_file;
 	bool recurse = 0;
 	const char *cat = NULL;
 	char c;
@@ -122,9 +123,12 @@ int main(int argc, char *const *argv)
 	if (dashdash - optind < 1)
 		usage(*argv);
 
+	sch_init(&sch_ctx, recurse);
+	file_open(&sch_file, argv[dashdash - 1], NULL);
+
 	lib_init(&lib);
 	for (arg = optind; arg != dashdash - 1; arg++)
-		lib_parse(&lib, argv[arg]);
+		lib_parse(&lib, argv[arg], &sch_file);
 
 	if (dashdash == argc) {
 		gfx_argc = 1;
@@ -151,8 +155,9 @@ found:
 
 	optind = 0; /* reset getopt */
 
-	sch_init(&sch_ctx, recurse);
+	sch_parse(&sch_ctx, &sch_file, &lib);
-	sch_parse(&sch_ctx, argv[dashdash - 1], &lib);
+	file_close(&sch_file);
+
 	gfx_init(*ops, gfx_argc, gfx_argv);
 	if (recurse) {
 		const struct sheet *sheet;

eeshow/sch-parse.c

@@ -516,14 +516,10 @@ static bool parse_line(const struct file *file, void *user, const char *line)
 }
 
 
-void sch_parse(struct sch_ctx *ctx, const char *name, const struct lib *lib)
+void sch_parse(struct sch_ctx *ctx, struct file *file, const struct lib *lib)
 {
-	struct file file;
-
 	ctx->lib = lib;
-	file_open(&file, name, NULL);
+	file_read(file, parse_line, ctx);
-	file_read(&file, parse_line, ctx);
-	file_close(&file);
 }
 
 

eeshow/sch.h

@@ -18,6 +18,7 @@
 
 #include "dwg.h"
 #include "text.h"
+#include "file.h"
 #include "lib.h"
 
 
@@ -109,7 +110,7 @@ struct sch_ctx {
 void decode_alignment(struct text *txt, char hor, char vert);
 
 void sch_render(const struct sheet *sheet);
-void sch_parse(struct sch_ctx *ctx, const char *name, const struct lib *lib);
+void sch_parse(struct sch_ctx *ctx, struct file *file, const struct lib *lib);
 void sch_init(struct sch_ctx *ctx, bool recurse);
 
 #endif /* !SCH_H */