add .bashpowerline

1 files changed, 94 insertions, 0 deletions

diff --git a/.bash-powerline.sh b/.bash-powerline.sh
new file mode 100644
index 0000000..65bdf38
--- /dev/null
+++ b/.bash-powerline.sh
@@ -0,0 +1,94 @@
+#!/usr/bin/env bash
+
+## Uncomment to disable git info
+#POWERLINE_GIT=0
+
+__powerline() {
+    # Colorscheme
+    readonly RESET='\[\033[m\]'
+    readonly COLOR_CWD='\[\033[0;34m\]' # blue
+    readonly COLOR_GIT='\[\033[0;36m\]' # cyan
+    #readonly COLOR_SUCCESS='\[\033[0;32m\]' # green
+    readonly COLOR_SUCCESS='\[\033[0;34m\]' # blue
+    readonly COLOR_FAILURE='\[\033[0;31m\]' # red
+
+    readonly SYMBOL_GIT_BRANCH='⑂'
+    readonly SYMBOL_GIT_MODIFIED='*'
+    readonly SYMBOL_GIT_PUSH='↑'
+    readonly SYMBOL_GIT_PULL='↓'
+
+    if [[ -z "$PS_SYMBOL" ]]; then
+      case "$(uname)" in
+          # Darwin)   PS_SYMBOL='';;
+          Darwin)   PS_SYMBOL='$';;
+          Linux)    PS_SYMBOL='$';;
+          *)        PS_SYMBOL='%';;
+      esac
+    fi
+
+    __git_info() { 
+        [[ $POWERLINE_GIT = 0 ]] && return # disabled
+        hash git 2>/dev/null || return # git not found
+        local git_eng="env LANG=C git"   # force git output in English to make our work easier
+
+        # get current branch name
+        local ref=$($git_eng symbolic-ref --short HEAD 2>/dev/null)
+
+        if [[ -n "$ref" ]]; then
+            # prepend branch symbol
+            ref=$SYMBOL_GIT_BRANCH$ref
+        else
+            # get tag name or short unique hash
+            ref=$($git_eng describe --tags --always 2>/dev/null)
+        fi
+
+        [[ -n "$ref" ]] || return  # not a git repo
+
+        local marks
+
+        # scan first two lines of output from `git status`
+        while IFS= read -r line; do
+            if [[ $line =~ ^## ]]; then # header line
+                [[ $line =~ ahead\ ([0-9]+) ]] && marks+=" $SYMBOL_GIT_PUSH${BASH_REMATCH[1]}"
+                [[ $line =~ behind\ ([0-9]+) ]] && marks+=" $SYMBOL_GIT_PULL${BASH_REMATCH[1]}"
+            else # branch is modified if output contains more lines after the header line
+                marks="$SYMBOL_GIT_MODIFIED$marks"
+                break
+            fi
+        done < <($git_eng status --porcelain --branch 2>/dev/null)  # note the space between the two <
+
+        # print the git branch segment without a trailing newline
+        printf " $ref$marks"
+    }
+
+    ps1() {
+        # Check the exit code of the previous command and display different
+        # colors in the prompt accordingly. 
+        if [ $? -eq 0 ]; then
+            local symbol="$COLOR_SUCCESS $PS_SYMBOL $RESET"
+        else
+            local symbol="$COLOR_FAILURE $PS_SYMBOL $RESET"
+        fi
+
+        local cwd="$COLOR_CWD\w$RESET"
+        # Bash by default expands the content of PS1 unless promptvars is disabled.
+        # We must use another layer of reference to prevent expanding any user
+        # provided strings, which would cause security issues.
+        # POC: https://github.com/njhartwell/pw3nage
+        # Related fix in git-bash: https://github.com/git/git/blob/9d77b0405ce6b471cb5ce3a904368fc25e55643d/contrib/completion/git-prompt.sh#L324
+        if shopt -q promptvars; then
+            __powerline_git_info="$(__git_info)"
+            local git="$COLOR_GIT\${__powerline_git_info}$RESET"
+        else
+            # promptvars is disabled. Avoid creating unnecessary env var.
+            local git="$COLOR_GIT$(__git_info)$RESET"
+        fi
+
+        PS1="$cwd$git$symbol"
+    }
+
+    PROMPT_COMMAND="ps1${PROMPT_COMMAND:+; $PROMPT_COMMAND}"
+}
+
+__powerline
+unset __powerline