Move entire git-prompt to C

This commit is contained in:
Kenneth Benzie 2018-09-11 17:57:40 +01:00
parent 2740f9bc8d
commit 5f2c5b58da
2 changed files with 217 additions and 112 deletions

203
git-prompt.c Normal file
View File

@ -0,0 +1,203 @@
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if __linux__
#include <sys/wait.h>
#endif
#ifdef DEBUG
#define check(CONDITION) \
if (CONDITION) { \
fprintf(stderr, "error: %s: %d: %s\n", __FILE__, __LINE__, #CONDITION); \
exit(0); \
}
#else
#define check(CONDITION) \
if (CONDITION) { \
exit(0); \
}
#endif
typedef struct process {
pid_t pid;
FILE* out;
} process_t;
process_t process_open(char* command) {
int fds[2];
check(pipe(fds));
int pid = fork();
check(pid == -1);
if (pid == 0) { // child process
close(fds[0]);
dup2(fds[1], STDOUT_FILENO);
dup2(STDOUT_FILENO, STDERR_FILENO);
char* argv[] = {"sh", "-c", command, NULL};
exit(execvp(argv[0], argv));
} else { // parent process
close(fds[1]);
process_t process = {pid, fdopen(fds[0], "rb")};
return process;
}
}
int process_close(process_t process) {
fclose(process.out);
int status;
check(process.pid != waitpid(process.pid, &status, 0));
if (WIFEXITED(status)) {
return WEXITSTATUS(status);
}
return 0;
}
char* trim(char* str) {
char* end;
while (isspace((unsigned char)*str)) str++;
if (*str == 0) {
return str;
}
end = str + strlen(str) - 1;
while (end > str && isspace((unsigned char)*end)) {
end--;
}
end[1] = '\0';
return str;
}
char* append(char* buffer, int count, ...) {
va_list list;
int i;
va_start(list, count);
for (i = 0; i < count; i++) {
strcat(buffer, va_arg(list, char*));
}
va_end(list);
return buffer;
}
char* inttostr(char* buffer, int value) {
sprintf(buffer, "%d", value);
return buffer;
}
int main() {
// get the current branch name
process_t process = process_open("git symbolic-ref --short HEAD");
char branch_buf[256] = {};
fread(branch_buf, 1, sizeof(branch_buf), process.out);
if (process_close(process)) {
// current HEAD is not a symbolic ref
process = process_open("git rev-parse --abbrev-ref HEAD");
memset(branch_buf, 0, sizeof(branch_buf));
fread(branch_buf, 1, sizeof(branch_buf), process.out);
check(process_close(process));
if (strcmp("HEAD", trim(branch_buf)) == 0) {
// get the commit hash
process = process_open("git rev-parse --short HEAD");
memset(branch_buf, 0, sizeof(branch_buf));
fread(branch_buf, 1, sizeof(branch_buf), process.out);
check(process_close(process));
}
}
char* branch = trim(branch_buf);
char prompt[1024] = {};
append(prompt, 3, " %{%F{66}%}", branch, "%{%f%}");
// get the upstream remote if one exists
char command[1024] = {};
append(command, 3, "git config branch.", branch, ".remote");
process = process_open(command);
char remote_buf[256] = {};
fread(remote_buf, 1, sizeof(remote_buf), process.out);
if (process_close(process) == 0) {
char* remote = trim(remote_buf);
// get the number of commits ahead of the remote
memset(command, 0, sizeof(command));
process = process_open(append(command, 5,
"git rev-list --right-only refs/remotes/",
remote, "/", branch, "...HEAD --count"));
char count[32] = {};
fread(count, 1, sizeof(count), process.out);
if(process_close(process) == 0 && strcmp("0", trim(count))) {
append(prompt, 2, "", trim(count));
}
// get the number of commits behind the remote
memset(command, 0, sizeof(command));
process = process_open(append(command, 5,
"git rev-list --left-only refs/remotes/",
remote, "/", branch, "...HEAD --count"));
memset(count, 0, sizeof(count));
fread(count, 1, sizeof(count), process.out);
if(process_close(process) == 0 && strcmp("0", trim(count))) {
append(prompt, 2, "", trim(count));
}
}
append(prompt, 1, " ");
// get the status and parse it
process = process_open("git status --porcelain");
char status[2048];
int indexed = 0, modified = 0, deleted = 0, untracked = 0, unmerged = 0;
while (NULL != fgets(status, sizeof(status) - 1, process.out)) {
char X = status[0];
char Y = status[1];
if (X == '?' && Y == '?') {
++untracked;
} else if ((X == 'A' && (Y == 'A' || Y == 'U')) ||
(X == 'D' && (Y == 'D' || Y == 'U')) ||
(X == 'U' && (Y == 'A' || Y == 'D' || Y == 'D' || Y == 'U'))) {
++unmerged;
} else {
switch (X) {
case ' ':
switch (Y) {
case 'M': ++modified; break;
case 'D': ++deleted; break;
} break;
case 'D': ++indexed;
switch (Y) {
case ' ': break;
case 'M': ++modified; break;
} break;
case 'M': case 'A': case 'R': case 'C': ++indexed;
switch (Y) {
case ' ': break;
case 'M': ++modified; break;
case 'D': ++deleted; break;
} break;
}
}
}
check(process_close(process));
if (indexed || modified || deleted || unmerged || untracked) { // modified
char int_buf[32];
if (indexed) {
append(prompt, 3, "%{%F{2}%}*", inttostr(int_buf, indexed), "%{%f%}");
}
if (modified) {
append(prompt, 3, "%{%F{1}%}+", inttostr(int_buf, modified), "%{%f%}");
}
if (deleted) {
append(prompt, 3, "%{%F{1}%}-", inttostr(int_buf, deleted), "%{%f%}");
}
if (unmerged) {
append(prompt, 3, "%{%B%F{1}%}×", inttostr(int_buf, unmerged), "%{%f%}");
}
if (untracked) {
append(prompt, 1, "%{%F{1}%}…%{%f%}");
}
} else { // clean
append(prompt, 1, "%{%B%F{2}%}✓%{%f%b%}");
}
// print the prompt
puts(prompt);
return 0;
}

View File

@ -1,17 +1,18 @@
prompt_fresh_help() { prompt_fresh_help() {
echo "\ echo "\
options: options:
-a enable almostontop like behaviour" -a enable almostontop like behaviour
-r recompile git-prompt executable"
} }
prompt_fresh_setup() { prompt_fresh_setup() {
fresh_compile_git_prompt
# Parse options # Parse options
local almostontop=0 local almostontop=0
while getopts 'a' opt; do local recompile=0
while getopts 'ar' opt; do
case $opt in case $opt in
a) local almostontop=1 ;; a) local almostontop=1 ;;
r) local recompile=1 ;;
*) prompt -h fresh; return 1 ;; *) prompt -h fresh; return 1 ;;
esac esac
done done
@ -31,6 +32,9 @@ prompt_fresh_setup() {
add-zsh-hook -d preexec fresh_almostontop add-zsh-hook -d preexec fresh_almostontop
fi fi
[ $recompile -eq 1 ] && prompt_cleanup
fresh_compile_git_prompt
if [ "$USER" = "root" ]; then if [ "$USER" = "root" ]; then
local user="%{%F{1}%}%n%{%f%}" local user="%{%F{1}%}%n%{%f%}"
else else
@ -50,7 +54,7 @@ prompt_fresh_setup() {
} }
prompt_cleanup() { prompt_cleanup() {
if [ -f ~/.cache/zsh/git-prompt ]; then rm ~/.cache/zsh/git-prompt; fi [ -f ~/.cache/zsh/git-prompt ] && rm ~/.cache/zsh/git-prompt
} }
fresh_line_one() { fresh_line_one() {
@ -64,58 +68,7 @@ fresh_line_one() {
local directory="%{%F{37}%}%~%{%f%}" local directory="%{%F{37}%}%~%{%f%}"
# Check we are in a git repository # Check we are in a git repository
if `git rev-parse --git-dir > /dev/null 2>&1`; then local git=`~/.cache/zsh/git-prompt`
# Get git branch name & exit early if not found
local branch="`git symbolic-ref HEAD 2> /dev/null`"
if [ "" = "$branch" ]; then
local branch="`git rev-parse --abbrev-ref HEAD`"
if [ "HEAD" = "$branch" ]; then
local branch="`git rev-parse --short $branch`"
fi
fi
if [ "$branch" != "" ]; then
local branch=${branch#refs/heads/}
# Get the number of commits ahead/behind from the remote branch
local remote="`git config branch.$branch.remote 2> /dev/null`"
if [ "" != "remote" ]; then
local branches="refs/remotes/$remote/$branch...HEAD"
local nahead=`git rev-list --right-only $branches --count 2> /dev/null`
if [ "0" -ne "$nahead" ]; then local ahead="↑$nahead"; fi
local nbehind=`git rev-list --left-only $branches --count 2> /dev/null`
if [ "0" -ne "$nbehind" ]; then local behind="↓$nbehind"; fi
fi
# Construct the git prompt
local git=" %{%F{66}%}$branch%{%f%}$ahead$behind "
if [ -f ~/.cache/zsh/git-prompt ]; then
# Get the change counts from git-prompt
local counts=(`~/.cache/zsh/git-prompt`)
# Parse the results from git-prompt
if [ 0 -eq ${#counts[@]} ]; then # clean
local git="$git%{%B%F{2}%}✓%{%f%b%}";
else
if [ 0 != $counts[1] ]; then # indexed
local git="$git%{%F{2}%}*$counts[1]%{%f%}"
fi
if [ 0 != $counts[2] ]; then # modified
local git="$git%{%F{1}%}+$counts[2]%{%f%}";
fi
if [ 0 != $counts[3] ]; then # deleted
local git="$git%{%F{1}%}-$counts[3]%{%f%}";
fi
if [ 0 != $counts[4] ]; then # unmerged
local git="$git%{%B%F{1}%}×$counts[4]%{%f%b%}";
fi
if [ 0 != $counts[5] ]; then # untracked
local git="$git%{%F{1}%}…%{%f%}";
fi
fi
fi
fi
fi
# If the last command failed, display its error code at the right # If the last command failed, display its error code at the right
if [[ $exit_code -ne 0 ]]; then if [[ $exit_code -ne 0 ]]; then
@ -145,62 +98,11 @@ fresh_almostontop() {
fresh_compile_git_prompt() { fresh_compile_git_prompt() {
# Compile a simple C program which parses the output of `git status # Compile a simple C program which parses the output of `git status
# --procelain` to greatly decrease the time taken to draw the prompt # --procelain` to greatly decrease the time taken to draw the prompt
local cache=~/.cache/zsh; [ ! -d $cache ] && mkdir -p $cache [ ! -d ~/.cache/zsh ] && mkdir -p ~/.cache/zsh
if [ ! -f $cache/git-prompt ]; then if [ ! -f ~/.cache/zsh/git-prompt ]; then
cc -x c -std=gnu99 -O3 -DNDEBUG -o $cache/git-prompt - 2> /dev/null << EOF cc -std=gnu99 -O3 -DNDEBUG ~/.config/zsh/git-prompt.c -o ~/.cache/zsh/git-prompt
#include <stdio.h>
#include <stdlib.h>
int main() {
FILE *file = popen("git status --porcelain", "r");
if (NULL == file) { return 0; }
char status[2048];
int indexed = 0, modified = 0, deleted = 0, untracked = 0, unmerged = 0;
while (NULL != fgets(status, sizeof(status) - 1, file)) {
char X = status[0];
char Y = status[1];
if (X == '?' && Y == '?') {
++untracked;
} else if ((X == 'A' && (Y == 'A' || Y == 'U')) ||
(X == 'D' && (Y == 'D' || Y == 'U')) ||
(X == 'U' && (Y == 'A' || Y == 'D' || Y == 'D' || Y == 'U'))) {
++unmerged;
} else {
switch (X) {
case ' ':
switch (Y) {
case 'M': ++modified; break;
case 'D': ++deleted; break;
} break;
case 'D': ++indexed;
switch (Y) {
case ' ': break;
case 'M': ++modified; break;
} break;
case 'M': case 'A': case 'R': case 'C': ++indexed;
switch (Y) {
case ' ': break;
case 'M': ++modified; break;
case 'D': ++deleted; break;
} break;
}
}
}
pclose(file);
if (indexed || modified || deleted || unmerged || untracked) {
printf("%d %d %d %d %d", indexed, modified, deleted, unmerged, untracked);
}
return 0;
}
EOF
if [ $? -ne 0 ]; then if [ $? -ne 0 ]; then
echo "git prompt disabled, are the system development headers installed?" echo "git-prompt was not compiled, is a C99 toolchain installed?"
fi fi
fi fi
} }