--- /dev/null
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "email.h"
+
+#include "common.h"
+#include "buf.h"
+#include "diff_generate.h"
+#include "diff_stats.h"
+#include "patch.h"
+#include "date.h"
+
+#include "git2/email.h"
+#include "git2/patch.h"
+#include "git2/version.h"
+
+/*
+ * Git uses a "magic" timestamp to indicate that an email message
+ * is from `git format-patch` (or our equivalent).
+ */
+#define EMAIL_TIMESTAMP "Mon Sep 17 00:00:00 2001"
+
+GIT_INLINE(int) include_prefix(
+ size_t patch_count,
+ git_email_create_options *opts)
+{
+ return ((!opts->subject_prefix || *opts->subject_prefix) ||
+ (opts->flags & GIT_EMAIL_CREATE_ALWAYS_NUMBER) != 0 ||
+ opts->reroll_number ||
+ (patch_count > 1 && !(opts->flags & GIT_EMAIL_CREATE_OMIT_NUMBERS)));
+}
+
+static int append_prefix(
+ git_str *out,
+ size_t patch_idx,
+ size_t patch_count,
+ git_email_create_options *opts)
+{
+ const char *subject_prefix = opts->subject_prefix ?
+ opts->subject_prefix : "PATCH";
+
+ git_str_putc(out, '[');
+
+ if (*subject_prefix)
+ git_str_puts(out, subject_prefix);
+
+ if (opts->reroll_number) {
+ if (*subject_prefix)
+ git_str_putc(out, ' ');
+
+ git_str_printf(out, "v%" PRIuZ, opts->reroll_number);
+ }
+
+ if ((opts->flags & GIT_EMAIL_CREATE_ALWAYS_NUMBER) != 0 ||
+ (patch_count > 1 && !(opts->flags & GIT_EMAIL_CREATE_OMIT_NUMBERS))) {
+ size_t start_number = opts->start_number ?
+ opts->start_number : 1;
+
+ if (*subject_prefix || opts->reroll_number)
+ git_str_putc(out, ' ');
+
+ git_str_printf(out, "%" PRIuZ "/%" PRIuZ,
+ patch_idx + (start_number - 1),
+ patch_count + (start_number - 1));
+ }
+
+ git_str_puts(out, "]");
+
+ return git_str_oom(out) ? -1 : 0;
+}
+
+static int append_date(
+ git_str *out,
+ const git_time *date)
+{
+ int error;
+
+ if ((error = git_str_printf(out, "Date: ")) == 0 &&
+ (error = git_date_rfc2822_fmt(out, date->time, date->offset)) == 0)
+ error = git_str_putc(out, '\n');
+
+ return error;
+}
+
+static int append_subject(
+ git_str *out,
+ size_t patch_idx,
+ size_t patch_count,
+ const char *summary,
+ git_email_create_options *opts)
+{
+ bool prefix = include_prefix(patch_count, opts);
+ size_t summary_len = summary ? strlen(summary) : 0;
+ int error;
+
+ if (summary_len) {
+ const char *nl = strchr(summary, '\n');
+
+ if (nl)
+ summary_len = (nl - summary);
+ }
+
+ if ((error = git_str_puts(out, "Subject: ")) < 0)
+ return error;
+
+ if (prefix &&
+ (error = append_prefix(out, patch_idx, patch_count, opts)) < 0)
+ return error;
+
+ if (prefix && summary_len && (error = git_str_putc(out, ' ')) < 0)
+ return error;
+
+ if (summary_len &&
+ (error = git_str_put(out, summary, summary_len)) < 0)
+ return error;
+
+ return git_str_putc(out, '\n');
+}
+
+static int append_header(
+ git_str *out,
+ size_t patch_idx,
+ size_t patch_count,
+ const git_oid *commit_id,
+ const char *summary,
+ const git_signature *author,
+ git_email_create_options *opts)
+{
+ char id[GIT_OID_HEXSZ];
+ int error;
+
+ if ((error = git_oid_fmt(id, commit_id)) < 0 ||
+ (error = git_str_printf(out, "From %.*s %s\n", GIT_OID_HEXSZ, id, EMAIL_TIMESTAMP)) < 0 ||
+ (error = git_str_printf(out, "From: %s <%s>\n", author->name, author->email)) < 0 ||
+ (error = append_date(out, &author->when)) < 0 ||
+ (error = append_subject(out, patch_idx, patch_count, summary, opts)) < 0)
+ return error;
+
+ if ((error = git_str_putc(out, '\n')) < 0)
+ return error;
+
+ return 0;
+}
+
+static int append_body(git_str *out, const char *body)
+{
+ size_t body_len;
+ int error;
+
+ if (!body)
+ return 0;
+
+ body_len = strlen(body);
+
+ if ((error = git_str_puts(out, body)) < 0)
+ return error;
+
+ if (body_len && body[body_len - 1] != '\n')
+ error = git_str_putc(out, '\n');
+
+ return error;
+}
+
+static int append_diffstat(git_str *out, git_diff *diff)
+{
+ git_diff_stats *stats = NULL;
+ unsigned int format_flags;
+ int error;
+
+ format_flags = GIT_DIFF_STATS_FULL | GIT_DIFF_STATS_INCLUDE_SUMMARY;
+
+ if ((error = git_diff_get_stats(&stats, diff)) == 0 &&
+ (error = git_diff__stats_to_buf(out, stats, format_flags, 0)) == 0)
+ error = git_str_putc(out, '\n');
+
+ git_diff_stats_free(stats);
+ return error;
+}
+
+static int append_patches(git_str *out, git_diff *diff)
+{
+ size_t i, deltas;
+ int error = 0;
+
+ deltas = git_diff_num_deltas(diff);
+
+ for (i = 0; i < deltas; ++i) {
+ git_patch *patch = NULL;
+
+ if ((error = git_patch_from_diff(&patch, diff, i)) >= 0)
+ error = git_patch__to_buf(out, patch);
+
+ git_patch_free(patch);
+
+ if (error < 0)
+ break;
+ }
+
+ return error;
+}
+
+int git_email__append_from_diff(
+ git_str *out,
+ git_diff *diff,
+ size_t patch_idx,
+ size_t patch_count,
+ const git_oid *commit_id,
+ const char *summary,
+ const char *body,
+ const git_signature *author,
+ const git_email_create_options *given_opts)
+{
+ git_email_create_options opts = GIT_EMAIL_CREATE_OPTIONS_INIT;
+ int error;
+
+ GIT_ASSERT_ARG(out);
+ GIT_ASSERT_ARG(diff);
+ GIT_ASSERT_ARG(!patch_idx || patch_idx <= patch_count);
+ GIT_ASSERT_ARG(commit_id);
+ GIT_ASSERT_ARG(author);
+
+ GIT_ERROR_CHECK_VERSION(given_opts,
+ GIT_EMAIL_CREATE_OPTIONS_VERSION,
+ "git_email_create_options");
+
+ if (given_opts)
+ memcpy(&opts, given_opts, sizeof(git_email_create_options));
+
+ if ((error = append_header(out, patch_idx, patch_count, commit_id, summary, author, &opts)) == 0 &&
+ (error = append_body(out, body)) == 0 &&
+ (error = git_str_puts(out, "---\n")) == 0 &&
+ (error = append_diffstat(out, diff)) == 0 &&
+ (error = append_patches(out, diff)) == 0)
+ error = git_str_puts(out, "--\nlibgit2 " LIBGIT2_VERSION "\n\n");
+
+ return error;
+}
+
+int git_email_create_from_diff(
+ git_buf *out,
+ git_diff *diff,
+ size_t patch_idx,
+ size_t patch_count,
+ const git_oid *commit_id,
+ const char *summary,
+ const char *body,
+ const git_signature *author,
+ const git_email_create_options *given_opts)
+{
+ git_str email = GIT_STR_INIT;
+ int error;
+
+ git_buf_tostr(&email, out);
+
+ error = git_email__append_from_diff(&email, diff, patch_idx,
+ patch_count, commit_id, summary, body, author,
+ given_opts);
+
+ if (error == 0)
+ error = git_buf_fromstr(out, &email);
+
+ git_str_dispose(&email);
+ return error;
+}
+
+int git_email_create_from_commit(
+ git_buf *out,
+ git_commit *commit,
+ const git_email_create_options *given_opts)
+{
+ git_email_create_options opts = GIT_EMAIL_CREATE_OPTIONS_INIT;
+ git_diff *diff = NULL;
+ git_repository *repo;
+ git_diff_options *diff_opts;
+ git_diff_find_options *find_opts;
+ const git_signature *author;
+ const char *summary, *body;
+ const git_oid *commit_id;
+ int error = -1;
+
+ GIT_ASSERT_ARG(out);
+ GIT_ASSERT_ARG(commit);
+
+ GIT_ERROR_CHECK_VERSION(given_opts,
+ GIT_EMAIL_CREATE_OPTIONS_VERSION,
+ "git_email_create_options");
+
+ if (given_opts)
+ memcpy(&opts, given_opts, sizeof(git_email_create_options));
+
+ repo = git_commit_owner(commit);
+ author = git_commit_author(commit);
+ summary = git_commit_summary(commit);
+ body = git_commit_body(commit);
+ commit_id = git_commit_id(commit);
+ diff_opts = &opts.diff_opts;
+ find_opts = &opts.diff_find_opts;
+
+ if ((error = git_diff__commit(&diff, repo, commit, diff_opts)) < 0)
+ goto done;
+
+ if ((opts.flags & GIT_EMAIL_CREATE_NO_RENAMES) == 0 &&
+ (error = git_diff_find_similar(diff, find_opts)) < 0)
+ goto done;
+
+ error = git_email_create_from_diff(out, diff, 1, 1, commit_id, summary, body, author, &opts);
+
+done:
+ git_diff_free(diff);
+ return error;
+}
projects / libgit2.git / blobdiff