From 7211f9c57204dc3b27327fc92352d99ad080a8db Mon Sep 17 00:00:00 2001
From: Galin Simeonov <gts@volconst.com>
Date: Sat, 25 Sep 2021 23:15:21 +0300
Subject: made it create a directory with files containing the output of the
 program

---
 CMakeLists.txt |   1 +
 git_part.c     |  47 ++++++++++++++--------
 git_part.h     |   9 +++--
 system_part.c  | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 system_part.h  |  32 +++++++++++++++
 volgit.c       |  15 ++++---
 6 files changed, 196 insertions(+), 29 deletions(-)
 create mode 100644 system_part.c
 create mode 100644 system_part.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a2b6a1c..8640830 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ endif( NOT CMAKE_BUILD_TYPE)
 include_directories(${CMAKE_SOURCE_DIR})
 set(SOURCES 
 	git_part.c
+	system_part.c
 	volgit.c
    )
 
diff --git a/git_part.c b/git_part.c
index 6d91717..f3b0877 100644
--- a/git_part.c
+++ b/git_part.c
@@ -2,16 +2,16 @@
 #define VOLGIT_GIT_PART_C VOLGIT_GIT_PART_C
 #include <git_part.h>
 
-int print_diff_line(const git_diff_delta *delta,const git_diff_hunk *hunk,const git_diff_line *line,void *payload)
+int print_diff_line(const git_diff_delta *delta,const git_diff_hunk *hunk,const git_diff_line *line,FILE *out)
 {
 	size_t i;
-	printf("%c ",line->origin);
+	fprintf(out,"%c ",line->origin);
 	for(i=0;i<line->content_len;++i)
-		printf("%c",line->content[i]);
+		fprintf(out,"%c",line->content[i]);
 	return 0;
 }
 
-void print_diff(git_tree *parent_tree,git_tree *current_tree,git_repository *repo)
+void print_diff(FILE *out,git_tree *parent_tree,git_tree *current_tree,git_repository *repo)
 {
 	git_diff *diff_from_parent;
 	size_t number_of_deltas=0;
@@ -19,28 +19,32 @@ void print_diff(git_tree *parent_tree,git_tree *current_tree,git_repository *rep
 
 	git_diff_tree_to_tree(&diff_from_parent,repo,current_tree,parent_tree,NULL);
 
-	git_diff_print(diff_from_parent,GIT_DIFF_FORMAT_PATCH,print_diff_line,NULL);
+	git_diff_print(diff_from_parent,GIT_DIFF_FORMAT_PATCH_ID,(git_diff_line_cb)print_diff_line,out);
 
 	if(diff_from_parent)
 		git_diff_free(diff_from_parent);
 }
-void print_headers_and_commit_message(git_commit *current_commit,git_oid *current)
+void print_headers_and_commit_message(FILE *where,git_commit *current_commit,git_oid *current)
 {
 	const git_signature *who_commited;
-	printf("COMMIT: %s\n",git_oid_tostr_s(current));
+	fprintf(where,"COMMIT: %s\n",git_oid_tostr_s(current));
 
 	who_commited=git_commit_committer(current_commit);
 
-	printf("AUTHOR: %s <%s>\n",who_commited->name,who_commited->email);
+	fprintf(where,"AUTHOR: %s <%s>\n",who_commited->name,who_commited->email);
 
-	printf("DATE: %s\n",ctime(&who_commited->when.time));
+	fprintf(where,"DATE: %s\n",ctime(&who_commited->when.time));
 
 
-	printf("\t%s\n",git_commit_message(current_commit));
+	fprintf(where,"\t%s\n",git_commit_message(current_commit));
 }
-void print_commits(const git_reference *branch, git_repository *repo)
+void print_commits(int dir_fd,const git_reference *branch, git_repository *repo)
 {
 	const git_oid *id;
+	FILE *log_file;
+	FILE *diff_file;
+	int diff_directory_fd;
+
 	git_revwalk *walker;
 	git_oid current;
 	git_commit *current_commit;
@@ -51,6 +55,10 @@ void print_commits(const git_reference *branch, git_repository *repo)
 	git_revwalk_new(&walker,repo);
 	id=git_reference_target(branch);
 	git_revwalk_push(walker,id);
+
+
+	log_file=create_file(dir_fd,"log");
+	diff_directory_fd=create_diff_dir(dir_fd);
 	
 	while(!git_revwalk_next(&current,walker))
 	{
@@ -58,22 +66,25 @@ void print_commits(const git_reference *branch, git_repository *repo)
 		git_commit_tree(&current_tree,current_commit);
 		if(parent_tree!=NULL)
 		{
-			print_diff(parent_tree,current_tree,repo);
+			diff_file=create_file(diff_directory_fd,git_oid_tostr_s(&current));
+			print_diff(diff_file,parent_tree,current_tree,repo);
 			git_tree_free(parent_tree);
 		}
 		
-		print_headers_and_commit_message(current_commit,&current);
+		print_headers_and_commit_message(log_file,current_commit,&current);
 
 		parent_tree=current_tree;
 		git_commit_free(current_commit);
 	}
 
-
+	git_revwalk_free(walker);
+	fclose(log_file);
 }
 
 void print_branches(git_repository *repo)
 {
 	const char *branch_name;
+	int branch_dir_fd;
 	git_branch_iterator *it;
 	git_reference *ref;
 	git_branch_t branch_type=GIT_BRANCH_LOCAL;
@@ -84,9 +95,11 @@ void print_branches(git_repository *repo)
 		git_branch_name(&branch_name,ref);	
 		if(branch_name)
 		{
-			printf("------- %s -------\n",branch_name);
-			print_commits(ref,repo);	
-			printf("------------------\n");
+			branch_dir_fd=create_branch_dir(branch_name);
+
+			print_commits(branch_dir_fd,ref,repo);	
+
+			close(branch_dir_fd);
 		}else
 		{
 			printf("NULL\n");
diff --git a/git_part.h b/git_part.h
index 9f39423..f1f8072 100644
--- a/git_part.h
+++ b/git_part.h
@@ -2,11 +2,12 @@
 #define VOLGIT_GIT_PART_H VOLGIT_GIT_PART_H
 #include <stdio.h>
 #include <git2.h>
+#include <system_part.h>
 
-int print_diff_line(const git_diff_delta *delta,const git_diff_hunk *hunk,const git_diff_line *line,void *payload);
-void print_diff(git_tree *parent_tree,git_tree *current_tree,git_repository *repo);
-void print_headers_and_commit_message(git_commit *current_commit,git_oid *current);
-void print_commits(const git_reference *branch, git_repository *repo);
+int print_diff_line(const git_diff_delta *delta,const git_diff_hunk *hunk,const git_diff_line *line,FILE *out);
+void print_diff(FILE *out,git_tree *parent_tree,git_tree *current_tree,git_repository *repo);
+void print_headers_and_commit_message(FILE* where,git_commit *current_commit,git_oid *current);
+void print_commits(int dir_fd,const git_reference *branch, git_repository *repo);
 
 void print_branches(git_repository *repo);
 
diff --git a/system_part.c b/system_part.c
new file mode 100644
index 0000000..aaf2301
--- /dev/null
+++ b/system_part.c
@@ -0,0 +1,121 @@
+#ifndef VOLGIT_SYSTEM_PART_C
+#define VOLGIT_SYSTEM_PART_C VOLGIT_SYSTEM_PART_C
+#include <system_part.h>
+
+const char *default_header="<!DOCTYPE html><html><head><title>GIT</title></head><body>";
+const char *default_footer="</body></html>";
+
+struct Volgit_Options options;
+
+void parse_options(int argc,char **argv)
+{
+
+	options.header=default_header;
+	options.footer=default_footer;
+	switch(argc)
+	{
+		case 5:
+			options.header=read_file(argv[3]);
+			options.footer=read_file(argv[4]);
+		/*falltrough*/
+		case 3:
+			options.input_path=argv[1];
+			options.output_path=argv[2];
+			break;
+		default:
+			die("Usage: volgit source destination [ file-containint-header file-containing-footer ]\n");
+	}
+
+	options.output_dir_fd=open(options.output_path,O_RDONLY|O_DIRECTORY);
+	if(options.output_dir_fd==-1)
+	{
+		mkdir(options.output_path,0770);
+		options.output_dir_fd=open(options.output_path,O_RDONLY|O_DIRECTORY);
+		if(options.output_dir_fd==-1)
+			die("Could not open output dir\n");
+	}
+}
+char* read_file(const char *filename)
+{
+	long file_size;
+	int file;
+	char *ret;
+	struct stat file_stats;
+
+	file=open(filename,O_RDONLY|O_CREAT);
+	if(file==-1)
+		die("Could not open file %s\n",filename);
+
+	fstat(file,&file_stats);
+
+	ret=malloc(file_stats.st_size+1);
+
+	if(ret==NULL)
+		die("Ran out of memory!\n");
+
+	close(file);
+	return ret;
+}
+
+int create_branch_dir(const char *branch_name)
+{
+	int ret=0;
+
+	ret=openat(options.output_dir_fd,branch_name,O_DIRECTORY|O_RDONLY);	
+	if(ret==-1)
+	{
+		if(mkdirat(options.output_dir_fd,branch_name,0770)==-1)
+			die("Could not create branch directory for %s\n",branch_name);
+
+		ret=openat(options.output_dir_fd,branch_name,O_DIRECTORY|O_RDONLY);	
+		if(ret==-1)
+			die("Could not open newly created directory for branch %s\n",branch_name);
+	}
+
+	return ret;
+}
+FILE* create_file(int branch_dir,const char *filename)
+{
+	int fd;
+	unlinkat(branch_dir,filename,0);
+	fd=openat(branch_dir,filename,O_CREAT|O_RDWR,0660);
+	if(fd==-1)
+		die("Could not open the file '%s' for one of the branches\n",filename);
+	return fdopen(fd,"w");
+}
+int create_files_dir(int branch_dir)
+{
+	int ret;
+
+	ret=openat(branch_dir,"files",O_DIRECTORY|O_RDONLY);	
+	if(ret!=-1)
+		return ret;
+
+	ret=mkdirat(branch_dir,"files",0770);
+	if(ret==-1)
+		die("Could not create the 'files' subdirectory of one of the branch dirs\n");
+
+	return ret;
+}
+int create_diff_dir(int branch_dir)
+{
+	int ret;
+
+	ret=openat(branch_dir,"diffs",O_DIRECTORY|O_RDONLY);	
+	if(ret!=-1)
+		return ret;
+	mkdirat(branch_dir,"diffs",0770);
+	ret=openat(branch_dir,"diffs",O_DIRECTORY|O_RDONLY);	
+	if(ret==-1)
+		die("Could not create the 'diffs' subdirectory of one of the branch dirs\n");
+	return ret;
+}
+
+void die(const char *format, ...)
+{
+	va_list args;
+	va_start(args,format);
+	vfprintf(stderr,format,args);
+	exit(1);
+}
+#endif
diff --git a/system_part.h b/system_part.h
new file mode 100644
index 0000000..ac06166
--- /dev/null
+++ b/system_part.h
@@ -0,0 +1,32 @@
+#ifndef VOLGIT_SYSTEM_PART_H
+#define VOLGIT_SYSTEM_PART_H VOLGIT_SYSTEM_PART_H
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdarg.h>
+
+extern const char *default_header;
+extern const char *default_footer;
+
+extern struct Volgit_Options
+{
+	const char *input_path;
+	const char *output_path;
+	const char *header;
+	const char *footer;
+	int output_dir_fd;
+}options;
+
+void die(const char *format, ...);
+
+void parse_options(int argc,char **argv);
+char* read_file(const char *filename);
+int create_branch_dir(const char *branch_name);
+FILE* create_file(int branch_dir,const char *filename);
+int create_files_dir(int branch_dir);
+int create_diff_dir(int branch_dir);
+
+
+#endif
diff --git a/volgit.c b/volgit.c
index dc391e7..cca9ae6 100644
--- a/volgit.c
+++ b/volgit.c
@@ -1,21 +1,20 @@
 #include <stdio.h>
 #include <git2.h>
+#include <system_part.h>
 #include <git_part.h>
 
 int main(int argc,char **argv)
 {
-	const char *repo_path;
-
-	if(argc<=1)
-	{
-		fprintf(stderr,"You need to specify a source dir for the repo\n");
-		return 1;
-	}
 
 	git_repository *repo;
 
 	git_libgit2_init();
-	git_repository_open(&repo,argv[1]);
+
+	parse_options(argc,argv);	
+
+	git_repository_open(&repo,options.input_path);
+	if(repo==NULL)
+		die("Could not open input git repository\n");
 
 	print_branches(repo);
 
-- 
cgit v1.2.3