lib/git.zsh
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 # get the name of the branch we are on
 function git_prompt_info() {
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   ref=$(git symbolic-ref HEAD 2> /dev/null) || return
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   echo "$ZSH_THEME_GIT_PROMPT_PREFIX${ref#refs/heads/}$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_SUFFIX"
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 }
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 # Checks if working tree is dirty
 parse_git_dirty() {
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   if [[ -n $(git status -s 2> /dev/null) ]]; then
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     echo "$ZSH_THEME_GIT_PROMPT_DIRTY"
   else
     echo "$ZSH_THEME_GIT_PROMPT_CLEAN"
   fi
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 }
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 # Checks if there are commits ahead from remote
 function git_prompt_ahead() {
   if $(echo "$(git log origin/master..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
     echo "$ZSH_THEME_GIT_PROMPT_AHEAD"
   fi
 }
 
 # Formats prompt string for current git commit short SHA
 function git_prompt_short_sha() {
   SHA=$(git rev-parse --short HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"
 }
 
 # Formats prompt string for current git commit long SHA
 function git_prompt_long_sha() {
   SHA=$(git rev-parse HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"
 }
 
 # Get the status of the working tree
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 git_prompt_status() {
   INDEX=$(git status --porcelain 2> /dev/null)
   STATUS=""
   if $(echo "$INDEX" | grep '^?? ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_UNTRACKED$STATUS"
   fi
   if $(echo "$INDEX" | grep '^A  ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_ADDED$STATUS"
   elif $(echo "$INDEX" | grep '^M  ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_ADDED$STATUS"
   fi
   if $(echo "$INDEX" | grep '^ M ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_MODIFIED$STATUS"
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   elif $(echo "$INDEX" | grep '^AM ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_MODIFIED$STATUS"
   elif $(echo "$INDEX" | grep '^ T ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_MODIFIED$STATUS"
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   fi
   if $(echo "$INDEX" | grep '^R  ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_RENAMED$STATUS"
   fi
   if $(echo "$INDEX" | grep '^ D ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_DELETED$STATUS"
   fi
   if $(echo "$INDEX" | grep '^UU ' &> /dev/null); then
     STATUS="$ZSH_THEME_GIT_PROMPT_UNMERGED$STATUS"
   fi
   echo $STATUS
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 }